JP2020097970A - Valve for septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a septic tank valve having a simple structure which does not cause a large increase in manufacturing cost, but which ensures high airtightness. A cylindrical portion (3) of a valve body (2) includes a proximal end portion (4) on the side of a handle portion (7) and a distal end portion (5) having an opening and a cutout portion, and the proximal end portion (4) and the distal end portion (5) are A peripheral groove 6 is formed so as to be separably connected, and a peripheral groove 6 is formed in the mating portion of the base end portion 4 and the distal end portion 5, and a seal member S1 that is in close contact with the inner peripheral surface of the valve body mounting hole is provided in the peripheral groove 6. It is fitted. [Selection diagram] Figure 2

Description

The present invention relates to a septic tank valve for adjusting and distributing a flow rate of a fluid such as air or water in a septic tank.

Examples of conventional septic tank valves include those having the configurations shown in the following Patent Documents 1 and 2.
The air valve for a septic tank disclosed in Patent Document 1 is a valve capable of finely adjusting an air flow rate, and a handle portion and a cylindrical portion of a valve body are integrally molded.
The flow rate control valve disclosed in Patent Document 2 includes a valve seat formed of a packing made of rubber or a synthetic resin having flexibility in order to enhance the sealing force between the outlet and the valve body.

JP, 2007-292132, A JP 2001-271944 A

According to the air valve for the septic tank of Patent Document 1, since the handle portion and the cylindrical portion of the valve body are integrally molded, the manufacturing cost can be suppressed, but a higher airtightness is provided between the valve box and the valve body. There is still room for improvement in terms of ensuring stability. For example, when the air valve for the septic tank is used to supply air to the aerobic treatment tank of the septic tank, there is no problem, but when used to supply air when backwashing the anaerobic treatment tank, If air leaks from the air valve for the septic tank when the backwashing process is not performed, the air will flow into the anaerobic processing tank, adversely affect the microorganisms in the anaerobic processing tank, and reduce the processing efficiency. There is a risk.

Further, according to the flow control valve of Patent Document 2, since the valve seat made of a flexible material such as rubber is provided, high airtightness can be secured between the valve box and the valve body. However, since the valve seat has a special shape, there is a problem that the manufacturing cost is large.

It is an object of the present invention to provide a septic tank valve that has a simple structure that does not cause a large increase in manufacturing cost, but that ensures high airtightness.

A septic tank valve according to the present invention includes a valve body having a cylindrical portion and a handle portion, and a valve box having a fluid inflow passage, a fluid outflow passage, and a valve body mounting hole, and an opening portion is provided at an end portion of the cylindrical portion. And a cutout portion communicating with the opening is provided on a side surface of the cylindrical portion, and the valve body rotates about an axis of the cylindrical portion with respect to a valve body mounting hole of the valve box. It is mounted freely, and the opening of the cylindrical portion is always open to the fluid outflow passage, and the cutout portion of the cylindrical portion is moved to the fluid inflow passage by rotating the handle portion. Is configured to be switched to a communication state or a non-communication state,
The cylindrical portion of the valve body includes a proximal end portion on the handle portion side and a distal end portion having the opening and the cutout portion, and the proximal end portion and the distal end portion are separably connected to each other. And
A peripheral groove is formed in a mating portion of the base end portion and the distal end portion, and a seal member that is in close contact with the inner peripheral surface of the valve body mounting hole is fitted in the peripheral groove.

According to this configuration, in the cylindrical portion of the valve body, the circumferential groove is formed in the mating portion of the base end portion and the tip end portion that are separably connected, and the inner circumferential surface of the valve body mounting hole of the valve box is formed. Since the seal member that is in close contact with is fitted in the circumferential groove, the airtightness between the valve box and the valve body can be further enhanced, as compared with the conventional septic tank valve that does not include the seal member. Further, the seal member does not have to have a special shape, and for example, a conventionally known annular elastic member can be used, so that the manufacturing cost does not increase significantly.

In the present invention, in the sealing member fitted in the circumferential groove of the cylindrical portion of the valve body, the portion of the sealing member located on the side of the cutout portion is the axial center of the cylindrical portion. A portion of the seal member located above the upper end of the passage port of the fluid inflow passage and located on the opposite side of the notch portion from the lower end of the passage port of the fluid inflow passage in the axial direction of the cylindrical portion. It is preferably located on the lower side.

According to this configuration, the portion of the seal member located on the side of the notch is located above the upper end of the passage port of the fluid inflow passage in the axial direction of the cylindrical portion, so that the handle portion is axially centered on the cylindrical portion. When the notch portion of the cylindrical portion is directed to the passage opening of the fluid inflow passage by rotating around, the fluid from the passage opening is located above the seal member, that is, on the side of the base end portion of the cylindrical portion. Be sure to prevent leakage. Further, since the portion of the seal member located on the opposite side of the cutout portion is located below the lower end of the passage port of the fluid inflow passage in the axial direction of the cylindrical portion, the handle portion is rotated around the axial center of the cylindrical portion. When the cutout portion of the cylindrical portion is directed toward the opposite side of the passage opening of the fluid inflow path by rotating, the fluid from the passage opening is below the seal member, that is, the tip portion side of the cylindrical portion and Be sure to prevent leakage to the fluid outflow passage.

In the present invention, it is preferable that the circumferential groove be inclined with respect to the axial direction of the cylindrical portion.

According to this configuration, since the circumferential groove for fitting the seal member is inclined, the circumferential length of the seal member can be kept to a necessary minimum, and the manufacturing cost can be further reduced. ..

In the present invention, it is preferable to include a rotation stopping mechanism that prevents relative rotation of the base end portion of the cylindrical portion with respect to the tip end portion of the cylindrical portion when the handle portion is rotated.

According to this configuration, the rotation preventing mechanism reliably transmits the rotational operation of the handle portion to the tip portion of the cylindrical portion, so that the fluid flow can be switched quickly.

In the present invention, it is preferable that the inner peripheral surface of the valve body mounting hole of the valve housing is provided with a small-diameter portion of the inner peripheral surface against which the tip portion of the valve body abuts.

According to this configuration, when the cylindrical portion of the valve body is fitted into the valve body mounting hole, the tip of the cylindrical portion of the valve body collides with the small diameter portion of the inner peripheral surface, so that the valve body of the valve body of the valve body The tip portion of the valve body is positioned in the mounting hole. Therefore, the valve body is arranged at a predetermined position in the valve body mounting hole of the plate box without using a means (for example, an adhesive or the like) for fixing the connection between the base end portion and the tip end portion of the cylindrical portion. As a result, the seal member can be easily replaced.

In the present invention, it is preferable that a pressing portion that comes into contact with the inner peripheral surface of the valve body mounting hole of the valve box is provided on the side surface of the tip end portion of the cylindrical portion on the side of the cutout portion.

According to this configuration, since the pressing portion is provided on the side surface of the distal end portion of the cylindrical portion on the side of the cutout portion, the cutout portion of the cylindrical portion is switched to the non-communication state with respect to the fluid inflow path. In this case, the close contact between the inner peripheral surface of the valve body mounting hole and the seal member is enhanced, and higher airtightness is secured.

In the present invention, the seal member is preferably an O-ring member.

According to this configuration, a commercially available O-ring member can be used as the seal member, so that the seal member is easily available, and since the quality is stable, the problem of securing airtightness hardly occurs.

In the present invention, it is preferable that the width of the circumferential groove in the axial direction of the cylindrical portion becomes narrower toward the outer side of the cylindrical portion.

According to this configuration, the seal member is less likely to come off from the circumferential groove, so that higher airtightness is secured.

It is an exploded perspective view of the valve for a septic tank. It is a side view of a valve body. It is a vertical side view of a valve box. It is a vertical side view of the septic tank valve in a communicating state (arrows indicate the flow of fluid). It is a vertical side view of a septic tank valve in a non-communication state (arrows indicate the flow of fluid). It is a vertical side view showing another embodiment of a septic tank valve. It is a side view which shows another embodiment of the peripheral groove in the cylindrical part of a valve body. It is a front view of a passage opening showing another embodiment of a passage opening of a fluid inflow passage. It is a front view of a passage opening showing another embodiment of a passage opening of a fluid inflow passage. It is a vertical side view showing another embodiment of a peripheral groove.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The septic tank valve 1 of the present invention can be applied to a septic tank including an anaerobic treatment tank, an aerobic treatment tank, an air diffuser, and the like. For example, when the septic tank valve 1 of the present invention is used as an air valve, the septic tank valve 1 of the present invention is provided in a pipe that connects an air pump installed outside the septic tank and an air diffuser in the septic tank, It can be used when supplying air to the aerobic treatment tank or performing backwashing treatment in the anaerobic treatment tank. The fluid applicable to the septic tank valve 1 of the present invention is not limited to gas such as air but may be liquid such as water.

As shown in FIGS. 1 and 2, a septic tank valve 1 according to the present embodiment has a valve body 2 having a cylindrical portion 3 and a handle portion 7, a fluid inflow portion 9, a fluid outflow portion 10, and a valve body mounting portion 11. A valve box 8 having a first seal member S1 and a second seal member S2.

The cylindrical portion 3 of the valve body 2 includes a proximal end portion 4 on the side of the handle portion 7 and a distal end portion 5 having an opening 51 and a notch 55, and the proximal end portion 4 and the distal end portion 5 are It is separably connected.

The base end portion 4 of the cylindrical portion 3 is provided at a substantially central portion of the disk-shaped handle portion 7, and has an annular inclined end surface 41 that is inclined with respect to the axial direction of the base end portion 4. Further, on the inner peripheral surface of the base end portion 4, there is provided a protruding piece portion 40 standing upright along the axial direction of the cylindrical portion 3.

The tip portion 5 of the cylindrical portion 3 includes a small diameter portion 50 and a large diameter portion 53. A recess 52 is formed at the edge of the opening 51 of the small diameter portion 50. The large-diameter portion 53 is provided with an opening 54 and an upper-center semicircular arch-shaped notch 55 communicating with the opening 54 on the side surface, and the opening 54 of the large-diameter portion 53 is connected to the fluid outflow passage 100. Always open to. An annular inclined surface 56 that is inclined with respect to the axial direction of the tip portion 5 is formed at the boundary between the small diameter portion 50 and the large diameter portion 53.

The small diameter portion 50 of the distal end portion 5 is configured to be fitted into the proximal end portion 4 when the proximal end portion 4 and the distal end portion 5 are connected. At this time, the protruding piece portion 40 of the base end portion 4 is fitted into and abuts against the recess 52 of the tip end portion 5 so that the tip end portion 5 is positioned relative to the base end portion 4 and the circle of the base end portion 4 is formed. The annular groove 6 is formed by the annular inclined end surface 41, the annular inclined surface 56 of the tip portion 5, and a part of the outer peripheral surface of the small diameter portion 50 of the tip portion 5. That is, a circumferential groove 6 that is inclined with respect to the axial direction of the cylindrical portion 3 is formed at the mating portion of the base end portion 4 and the tip end portion 5, and the annular first seal member S1 is It is fitted in the groove 6. A known O-ring member may be used as the first seal member S1.

A retaining portion 70 that engages with the flange portion 113 of the valve box 8 is provided around the base end portion 4 of the cylindrical portion 3 of the handle portion 7 of the valve body 2, and the retaining portion 70 of the handle portion 7 is provided. The valve body 2 is prevented from coming off from the valve box 8 by locking the valve body 2 to the flange portion 113 of the valve box 8. Further, the handle portion 7 of the valve body 2 is formed with an arcuate groove 71 penetrating in the thickness direction and extending in the circumferential direction, and the arcuate groove 71 has a plate-like stopper member for the valve box 8. 91 is configured to be inserted.

As shown in FIG. 3, the valve box 8 in the present embodiment is a so-called two-way valve that includes a cylindrical fluid inflow portion 9, a cylindrical fluid outflow portion 10, and a cylindrical valve body mounting portion 11. Make up. A fluid inflow passage 90, a fluid outflow passage 100, and a valve body mounting hole 110 are formed inside the fluid inflow portion 9, the fluid outflow portion 10, and the valve body mounting portion 11, respectively, and these communicate with each other. There is. A plate-shaped stopper member 91 is erected on the upper surface of the fluid inflow portion 9. An O-ring circumferential groove 101 is formed on the outer peripheral surface of the fluid outflow portion 10, and an O-ring member S3 is fitted in the O-ring circumferential groove 101. A flange portion 113 is formed on the outer peripheral surface of the valve body mounting portion 11.

In the present embodiment, the valve body 2 is rotatably attached to the valve body mounting hole 110 of the valve box 8 about the axis of the cylindrical portion 3, and the handle portion 7 is rotated to rotate the cylindrical portion. It is possible to switch the three notches 55 so that they are in a communication state or a non-communication state with respect to the fluid inflow passage 90. That is, as shown in FIG. 4, by rotating the handle portion 7 around the axis of the cylindrical portion 3 and directing the cutout portion 55 of the cylindrical portion 3 toward the passage port 92 of the fluid inflow path 90, the fluid inflow is obtained. Fluid can flow from the passage 90 to the fluid outlet passage 100 (see arrow in FIG. 4). On the other hand, as shown in FIG. 5, the handle portion 7 is again rotated around the axis of the cylindrical portion 3 to direct the cutout portion 55 of the cylindrical portion 3 to the opposite side of the passage port 92 of the fluid inflow passage 90. As a result, the passage port 92 of the fluid inflow passage 90 is closed by the side surface of the cylindrical portion 3, so that the advection of the fluid from the fluid inflow passage 90 to the fluid outflow passage 100 can be blocked (see the arrow in FIG. 5). ..

In the present embodiment, the protruding piece portion 40 of the base end portion 4 of the cylindrical portion 3 is fitted into the recess 52 of the tip end portion 5, so that the base end portion relative to the tip end portion 5 when the handle portion 7 is rotated. 4 relative rotation is prevented. That is, the protrusion 40 of the proximal end portion 4 of the cylindrical portion 3 and the recess 52 of the distal end portion 5 of the cylindrical portion 3 prevent the relative rotation of the proximal end portion 4 with respect to the distal end portion 5 of the cylindrical portion 3. Configure the mechanism. By this rotation stopping mechanism, the rotation operation of the handle portion 7 is surely transmitted to the distal end portion 5 of the cylindrical portion 3, so that the fluid flow can be switched quickly.

In this embodiment, the stopper member 91 of the valve box 8 is inserted into the arc-shaped groove 71 of the handle portion 7, and the handle member is within a range in which the stopper member 91 contacts both ends of the arc-shaped groove 71 in the longitudinal direction. It is configured so that the part 7 can be rotated. That is, when the stopper member 91 comes into contact with one end of the arcuate groove 71, the notch 55 of the cylindrical portion 3 is brought into communication with the fluid inflow passage 90, and the stopper member 91 comes into contact with the other end of the arcuate groove 71. At this time, the cutout portion 55 of the cylindrical portion 3 is not in communication with the fluid inflow passage 90.

As shown in FIGS. 4 and 5, the first seal member S1 is in close contact with the inner peripheral surface of the valve body mounting hole 110 of the valve box 8, whereby the cylindrical portion 3 of the valve body 2 and the valve box 8 are connected. Airtightness with the valve body mounting hole 110 is maintained. At this time, the portion of the first seal member S1 located on the side of the cutout portion 55 of the cylindrical portion 3 is located above the upper end of the passage port 92 of the fluid inflow passage 90 in the axial direction of the cylindrical portion 3, The portion of the first seal member S1 located on the opposite side of the cutout portion 55 of the portion 3 is below the lower end of the passage port 92 of the fluid inflow passage 90 in the axial direction of the cylindrical portion 3.

Since the portion of the first seal member S1 located on the side of the cutout portion 55 is located above the upper end of the passage port 92 of the fluid inflow passage 90 in the axial direction of the cylindrical portion 3, as shown in FIG. When the handle portion 7 is rotated around the axis of the cylindrical portion 3 to direct the cutout portion 55 of the cylindrical portion 3 toward the passage port 92 of the fluid inflow passage 90, the fluid from the passage port 92 is Leakage above the seal member S1, that is, toward the base end portion 4 side of the cylindrical portion 3 is reliably prevented. Further, since the portion of the first seal member S1 located on the opposite side of the cutout portion 55 is located below the lower end of the passage port 92 of the fluid inflow passage 90 in the axial direction of the cylindrical portion 3, as shown in FIG. As shown, when the handle portion 7 is rotated around the axis of the cylindrical portion 3 to direct the cutout portion 55 of the cylindrical portion 3 to the opposite side of the passage opening 92 of the fluid inflow passage 90, the passage opening 92 is formed. It is possible to reliably prevent the fluid from flowing out below the first seal member S1, that is, on the side of the distal end portion 5 of the cylindrical portion 3 and to the fluid outflow passage 100.

On the inner peripheral surface of the upper end of the valve body mounting hole 110, an annular step portion 111 for providing the second seal member S2 is provided. By providing the second seal member S2, the airtightness between the cylindrical portion 3 of the valve body 2 and the valve body mounting hole 110 of the valve box 8 is further improved. May be provided. A known O-ring member may be used for the second seal member S2.

On the inner peripheral surface at the lower end of the valve body mounting hole 110, an annular inner peripheral surface small diameter portion 112 (see FIG. 3) with which the tip portion 5 of the valve body 2 abuts is provided. The inner peripheral surface small-diameter portion 112 in the present embodiment is formed of a surface that is inclined with respect to the fitting direction of the cylindrical portion 3 of the valve body 2 so as to match the shape of the tip portion 5 of the valve body 2. However, the structure is not limited to this, and may be, for example, a surface facing the fitting direction of the cylindrical portion 3 of the valve body 2, that is, an annular step portion.

When the cylindrical portion 3 of the valve body 2 is fitted into the valve body mounting hole 110, the tip portion 5 of the valve body 2 abuts on the inner peripheral surface small diameter portion 112, so that the valve body mounting of the valve body 8 of the valve body 2 is performed. The tip portion 5 of the valve body 2 is positioned in the hole 110. Therefore, even if a means (for example, an adhesive agent) for fixing the connection between the base end portion 4 and the tip end portion 5 of the cylindrical portion 3 is not used, the valve body is placed at a predetermined position in the valve body mounting hole 110 of the plate box. As a result, the first seal member S1 can be easily replaced.

The septic tank valve 1 according to the present embodiment can be manufactured by a known injection molding method using a thermoplastic resin such as ABS resin.

[Another embodiment]
1. In the above-described embodiment, the valve box 8 is composed of a two-way valve, but the invention is not limited to this structure. For example, as shown in FIG. 6, the second fluid inflow part 12 (second fluid) may be used. The valve box 8 may be a three-way valve including the inflow passage 120).

2. In the above-described embodiment, the circumferential groove 6 that is inclined with respect to the axial direction of the cylindrical portion 3 is formed at the mating portion of the base end portion 4 and the tip end portion 5. Is not limited to this, and the portion of the first seal member S1 located on the side of the cutout portion 55 of the cylindrical portion 3 is formed in the passage port 92 of the fluid inflow passage 90 in the axial direction of the cylindrical portion 3. The portion of the first seal member S1 located above the upper end and on the side opposite to the cutout portion 55 of the cylindrical portion 3 is located below the lower end of the passage port 92 of the fluid inflow passage 90 in the axial direction of the cylindrical portion 3. If the structure is on the lower side, for example, as shown in FIG. 7, the circumferential groove 6 may have a wavy shape.

3. In the above-described embodiment, the configuration is shown in which the shape of the passage port 92 of the fluid inflow passage 90 is circular, but the shape of the passage port 92 of the fluid inflow passage 90 is not limited to this, and other configurations are possible. Also, for example, a rectangle (square, rectangle) as shown in FIG. 8 or a right triangle as shown in FIG. 9 may be used.

4. In the above-described embodiment, the configuration whose main function is to switch to one of the two states, that is, to put the fluid in a circulating state or to shut it off, is not limited to this configuration. Alternatively, the flow rate of the fluid may be adjusted. In this case, although not shown, for example, the shape of the cutout portion 55 of the cylindrical portion 3 described above may be a shape in which one leg having an upper semicircular arch shape is cut out obliquely to the opening portion 51, or As shown in FIG. 9, the shape of the passage port 92 of the fluid inflow path 90 may be a right triangle so that the septic tank valve 1 of the present invention may be provided with a flow rate adjusting function.

5. Although not shown, in the above-described embodiment, the side surface of the distal end portion 5 of the cylindrical portion 3 on the side of the notch 55 is slightly raised so as to contact the inner peripheral surface of the valve body mounting hole 110 of the valve box 8. A pad may be provided. According to this configuration, the pressing portion is provided on the side surface of the tip end portion 5 of the cylindrical portion 3 on the side of the notch portion 55, so that the notch portion 55 of the cylindrical portion 3 with respect to the fluid inflow path 90. When the state is switched to the non-communication state, the close contact between the inner peripheral surface of the valve body mounting hole 110 and the first seal member S1 increases, and higher airtightness is secured.

6. In the above-described embodiment, the width of the circumferential groove 6 in the axial direction of the cylindrical portion 3 becomes narrower toward the outer side of the cylindrical portion 3, for example, the sectional shape of the circumferential groove 6 as shown in FIG. It may have a trapezoidal configuration. In the septic tank valve 1 according to the present invention, the cylindrical portion 3 of the valve body 2 is configured such that the proximal end portion 4 and the distal end portion 5 are separable, so that the circumferential groove 6 has a width in the axial direction of the cylindrical portion 3. Can be easily formed into a shape that becomes narrower toward the outside of the cylindrical portion 3, for example, a substantially trapezoidal shape as shown in FIG. Further, in this case, it is usually very difficult to fit the first seal member S1 such as an O-ring member into the circumferential groove 6 from the outside of the narrow circumferential groove 6, but the cylindrical portion 3 of the valve body 2 is usually difficult. Since the base end portion 4 and the tip end portion 5 are separable from each other, it is possible to fit the first seal member S1 such as an O-ring member into the circumferential groove 6. According to this configuration, the first seal member S1 is less likely to come off from the circumferential groove 6, so that the effect of preventing the first seal member S1 from falling off is enhanced, and the first seal member S1 is connected to the base end portion 4 of the cylindrical portion 3. By sandwiching the tip portion 5 from above and below, the pressing pressure of the first seal member S1 against the inner peripheral surface of the valve body mounting hole 110 is increased, so that higher airtightness is secured.

The present invention can be applied to septic tanks, wastewater treatment facilities, and the like.

1: Valve for septic tank 2: Valve body 3: Cylindrical part 4: Base end part 40: Convex piece part 41: Inclined end face 5: Tip part 50: Small diameter part 51: Opening part 52: Recessed part 53: Large diameter part 54: Opening Portion 55: Notch 56: Inclined surface 6: Circumferential groove 7: Handle portion 70: Lockout portion 71: Arc groove 8: Valve box 9: Fluid inflow portion 90: Fluid inflow passage 91: Stopper member 92: Passage port 10: Fluid outflow portion 100: Fluid outflow passage 101: O-ring peripheral groove 11: Valve body mounting portion 110: Valve body mounting hole 111: Step portion 112: Inner peripheral surface small diameter portion 113: Flange portion 12: Second fluid inflow Part 120: second fluid inflow passage S1: first seal member S2: second seal member S3: O-ring member

Claims (8)

A valve body having a cylindrical portion and a handle portion, and a valve box having a fluid inflow passage, a fluid outflow passage, and a valve body mounting hole are provided, and an opening portion is provided at an end portion of the cylindrical portion. Is provided on the side surface of the cylindrical portion, the valve body is rotatably mounted around the axis of the cylindrical portion with respect to the valve body mounting hole of the valve box, The opening of the cylindrical portion is always open to the fluid outflow passage, and the cutout portion of the cylindrical portion is in communication with or not connected to the fluid inflow passage by rotating the handle portion. In the septic tank valve configured to be switched to the communication state,
The cylindrical portion of the valve body includes a proximal end portion on the handle portion side and a distal end portion having the opening and the cutout portion, and the proximal end portion and the distal end portion are separably connected to each other. And
A peripheral groove is formed in a mating portion of the base end portion and the distal end portion, and a seal member that is in close contact with an inner peripheral surface of the valve body mounting hole is fitted in the peripheral groove. Valve for septic tank. In the seal member fitted in the circumferential groove of the cylindrical portion of the valve body,
The portion of the seal member located on the side of the cutout is located above the upper end of the passage opening of the fluid inflow path in the axial direction of the cylindrical portion, and is located on the opposite side of the cutout. The septic tank valve according to claim 1, wherein a portion of the seal member is located below a lower end of a passage port of the fluid inflow path in an axial direction of the cylindrical portion. The septic tank valve according to claim 2, wherein the circumferential groove is inclined with respect to the axial direction of the cylindrical portion. The septic tank according to claim 2 or 3, further comprising a rotation preventing mechanism that prevents relative rotation of the base end portion of the cylindrical portion with respect to the tip end portion of the cylindrical portion when the handle portion is rotated. valve. The inner peripheral surface small diameter part which the front-end|tip part of the said valve body abuts is provided in the inner peripheral surface of the valve body mounting hole of the said valve box, The any one of Claims 2-4 characterized by the above-mentioned. Valve for septic tank. The pressing portion that comes into contact with the inner peripheral surface of the valve body mounting hole of the valve box is provided on a side surface of the tip end portion of the cylindrical portion on the side of the notch portion. The septic tank valve according to any one of items. The septic tank valve according to any one of claims 2 to 6, wherein the seal member is an O-ring member. The septic tank valve according to any one of claims 2 to 7, wherein a width of the circumferential groove in the axial direction of the cylindrical portion becomes narrower toward the outer side of the cylindrical portion.

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