JP2000088133A - Water level differential ball tap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent primary side pressure from increasing from a set value due to generation of water hammer and to prevent generation of a valve closing defective by providing a pressure relief valve on a primary side of a water level differential ball tap and performing a pressure adjustment when primary side pressure is increased from the set value. SOLUTION: At the time of a full water level, a float 46 is located at an ascending location, a cylinder 20 is sealed by a seal member 26 of a piston 24 and a water discharge valve 22 is in a closing state. When water hammer is generated in a primary side channel 14 and primary side pressure is increased from a set value in this state, increased pressure is discharged from a pressure relief valve 2 to the outside. Next, when a water level is lowered, an operating rod 42 is oscillated downward by lowering of the float 46 via a lever rod 44 and a link 45 and the water discharge valve 22 is opened. When seal of the seal member 26 for the cylinder 20 is released while this valve 20 is opened, the primary side channel 14 and a pressure chamber 27 are communicated and the water discharge valve 22 is fully opened at once.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a water level differential ball tap.

[0002]

2. Description of the Related Art Conventionally, as a ball tap of this kind,
There is a type in which a water discharge valve and a piston are connected by a valve rod, and a pressure receiving area of the piston that receives water supply pressure (primary pressure) in a valve closing direction in a valve closing direction is larger than a water receiving pressure in a valve closing direction. In this ball tap, since the valve closing force acting on the piston is larger than the valve opening force acting on the water discharge valve at the primary pressure, the closed state of the water discharge valve at the valve closing water level in the water receiving tank is maintained,
When the water level of the water receiving tank reaches the valve opening water level, the weight of the float acts on the water discharge valve, so that the valve opening is opened and the water is discharged by increasing the valve opening force from the valve closing force, This eliminates inconveniences such as the float opening and closing repeatedly opening and closing the valve unnecessarily in response to a slight change in the water level.

[0003]

However, on the primary side to which the ball tap is connected, for some reason (for example, when the stoppage of the water supply pipe is stopped by a stopcock for replacing a water meter, the stopcock is stopped). Backflow prevention function)
Water hammer may occur. As a result, the primary side pressure is increased from the normal set value, so that even if the weight of the float acts on the water discharge valve, the valve does not open as described above and the water level in the water receiving tank cannot be maintained at the predetermined water level. Had.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a pressure relief valve on the primary side of a water level differential ball tap to adjust the pressure when the primary side pressure exceeds a set value.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a main body of a water level differential type ball tap. The main body 1 is provided with a pressure relief valve 2 on the primary side of the main body 1, that is, integrally with the water supply port 3 of the main body 1 or in the vicinity of the water supply port 3. . In the pressure relief valve 2, a communication port 5 with the primary side and a pressure adjusting chamber 6 having a larger diameter than the primary side are continuously formed inside a cylindrical casing 4 via a large-diameter stepped portion 7. A valve 8 for opening and closing the communication port 5 is provided in the large-diameter step portion 7 so as to be able to freely contact and separate, and an adjusting spring 10 is compressed between the valve 8 and an adjusting screw 9 screwed into the upper part of the pressure adjusting chamber 6. The valve body 8 is urged in the valve closing direction. Further, the adjusting screw 9 is provided with a drain port 11 for communicating the pressure adjusting chamber 6 with the outside, and the adjusting screw 9 adjusts the urging force of the valve body 8 by the adjusting spring 10 so that the primary pressure becomes higher than the set pressure. At times, the valve body 8 is set so as to open the communication port 5.

The main body 1 is provided with an angle-shaped valve box 13 in which the flow path between the water supply port 3 and the water discharge port 12 is at a right angle.
A partition 16 is formed at the boundary between the primary flow path 14 and the secondary flow path 15, and a valve port 17 is formed at the center of the partition 16.
A valve seat 18 is protrudingly provided on the periphery of the secondary passage 15 toward the secondary flow path 15.

A cylindrical cylinder 20 is inserted into the upper opening 19 of the valve box 13 in a watertight manner, and a lid 21 is covered on the upper part of the cylinder 20 in a watertight manner. In the valve box 13, a disc-shaped water discharge valve 22 that receives the primary pressure in the valve opening direction in the secondary flow path 15 is provided so as to be able to freely contact and separate from the valve seat 18, and a secondary side is formed on the lower peripheral edge of the water discharge valve 22. Guide vanes 23 that slide on the wall surface of the flow path 15 project outward. A substantially cylindrical piston 24 for receiving the primary pressure in the valve closing direction is provided in the cylinder 20, and the pressure receiving area of the piston 24 is provided to be larger than that of the water discharge valve 22. The water discharge valve 22 and the piston 24 are connected by a valve rod 25 to form a valve mechanism.

The piston 24 has a sealing member 26 such as U-packing mounted in a groove formed around the piston 24, and a lip 26a protrudes outward below the sealing member 26. The seal member 26 is set so as to perform a sealing function when the water discharge valve 22 is closed, and to release the sealing function when the water discharge valve 22 is opened. That is, the cylinder
In FIG. 20, the part where the piston 24 moves between immediately before the water discharge valve 22 is closed and the valve is closed is the lip 26 of the seal member 26.
a has a diameter that slides on the cylinder 20, and in the cylinder 20, the part where the piston 24 moves from the initial opening of the water discharge valve 22 (the same immediately before closing) to the full opening is a sealing member 26. Lip 26a has a diameter that does not contact the cylinder 20.

In the cylinder 20, a pressure chamber 27 is provided on the back side of the piston 24. The pressure chamber 27 is shut off from the primary flow path 14 by the sealing member 26 in a watertight manner during the sealing function.
The pressure chamber 27 and the primary side flow path 14 communicate with each other when the seal is released. Further, the pressure chamber 27 is provided with a pressure discharge mechanism 28 that allows a slight leakage of pressure during the sealing function.

The pressure discharge mechanism 28 is provided with a discharge port 29 communicating with the outside in the ceiling (lid 21) of the pressure chamber 27, and connects the discharge valve 30 for opening and closing the discharge port 29 with the discharge valve 30. It comprises a valve guide section 32 connected at the upper part of the piston 24 via a rod 31 and a spring 33 for urging the discharge valve 30 from the back side of the piston 24 in the valve closing direction. The discharge valve 30 is formed in a disk shape slightly smaller in diameter than the pressure chamber 27, and is configured to provide a minute gap with the ceiling of the pressure chamber 27 in a closed state to seal the discharge port 29. The valve guide portion 32 is formed in a substantially hollow cylindrical shape slightly smaller in diameter than the pressure chamber 27, and has a lower end portion fixed to an upper portion of the piston 24. In the pressure chamber 27, the discharge valve 30 and the valve guide
A flow path 34 is provided around 32. The connecting rod 31 has an upper end fixed to the discharge valve 30, a lower part of which is inserted into an insertion hole 35 in the upper center of the valve guide part 32, and a retaining part provided at the lower end with a diameter larger than the insertion hole 35. The valve 36 is disposed in the hollow portion 37 of the valve guide 32, and is provided so as to be extendable and contractible from the valve guide 32. The spring 33 is interposed between the discharge valve 30 and the valve guide portion 32, and is supported by the valve guide portion 32 by the connecting rod 31.
30 is pressed to close the valve.

During the opening of the communication between the pressure chamber 27 and the primary flow path 14, at least the water discharge valve 22 is in a fully open state.
The length of the connecting rod 31 is set so that the discharge port 29 is opened by the movement of the piston 24. Further, a discharge passage 29 of the pressure chamber 27 and a through hole 38 provided in the secondary passage 15 are connected by a bypass passage 39. Note that the water discharge valve 22 and the through hole 38 are originally provided on the side of the valve box 13, but these parts are provided in front of the valve box 13 in the drawing to illustrate them.

Numeral 40 is a lever guide member vertically suspended at the center of the lower part of the water discharge valve 22. The lever guide member 40 penetrates a lateral hole 41 in the front-rear direction, and an operation rod 42 is inserted and held in the lateral hole 41. are doing. The operating rod 42 has its base end pivotally attached to the rear lower part of the valve box 13 and has its distal end inserted through an opening 43 formed in the lower front part of the valve box 13. On the other hand, the base end of the lever rod 44 is pivotally connected to the front upper part of the valve box 13, and the base lower part of the lever rod 44 and the distal end of the operation rod 42 are pivotally connected to each other by a link 45. A float 46 is provided at the tip of the lever 44. The lower surface in the lateral hole 41 has a predetermined gap S with the operating rod 42 at the upper limit position of the float 46. In the figure, 47 is a strainer, 48, 48a ... are O-rings.

Next, the operation of the water level differential ball tap according to the present invention will be described. FIG. 2 shows a valve-closed state when the water level is full. In this state, since the cylinder 20 is sealed by the seal member 26 of the piston 24, the water discharge valve 22
The primary pressure is acting on the piston 24 and the piston 24
Has a larger pressure receiving area than the water discharge valve 22, the closing force acting on the piston 24 is larger than the valve opening force acting on the water discharge valve 22 at the primary pressure, and the water discharge valve 22 maintains the closed state. I have.

Here, when a water hammer is generated in the primary side flow path 14 and the primary side pressure increases from a set value, the increased pressure is discharged to the outside by the pressure relief valve 2 and
The downstream pressure is adjusted and maintained at the set value.

When the water level drops, the operating rod 42 swings downward through the lever rod 44 and the link 45 due to the drop of the float 46. A slight difference in the water level, that is, the movement of the operating rod 42 within the gap S between the lateral holes 41 does not open the valve because no load acts on the lever guide member 40 below the water discharge valve 22. Then, when the valve opening water level is reached, the weight of the float 46 (excluding the buoyancy at the valve opening water level) acts on the lower surface of the lever guide member 40, and this is added to the valve opening force acting on the water discharge valve 22. Thus, the valve closing force acting on the piston 24 is greater than the valve closing force, and as shown in FIG. 3, the water discharge valve 22 is opened to discharge water.

When the seal of the seal member 26 with respect to the cylinder 20 is released during valve opening, the primary flow path 14 communicates with the pressure chamber 27, and the valve closing force to the piston 24 due to the primary pressure is completely reduced. , And all at once are fully opened as shown in FIG.
Immediately before or in the fully opened state, the discharge valve 30 is separated from the ceiling of the pressure chamber 27 to open the discharge port 29 by the movement of the piston 24 in the valve opening direction, and the pressure fluid flows from the pressure chamber 27 to the bypass flow path 39. After that, it is discharged to the secondary channel 15.

Next, when the water level rises due to the water discharge, the float 46
Rises, the water discharge valve 22 starts closing. Then, as shown in FIG. 3, when the seal member 26 seals the cylinder 20 at the position immediately before closing the valve, the pressure chamber 27 is substantially sealed.
At this time, the discharge valve 30 is already closed, but the pressure chamber
Since the pressure fluid in the pressure chamber 27 slightly leaks to the secondary flow path 15 from a minute gap provided between the pressure chamber 27 and the ceiling of the pressure chamber 27, the pressure in the pressure chamber 27 is the displacement amount of the water discharge valve 22 in the valve closing direction. And the water discharge valve 22 is gradually displaced in the valve closing direction to reach the valve closing.

[0018]

In short, the present invention connects a water discharge valve 22 for receiving the primary pressure in the valve opening direction and a piston 24 for receiving the primary pressure in the valve closing direction with a valve rod 25, and also receives a pressure receiving area of the piston 24 from the water discharge valve 22. The valve mechanism is provided in the main body 1 and the valve mechanism is connected to the float 46 interlocking with the water level, so that the valve closing force acting on the piston 24 at the primary pressure is applied to the water discharging valve 22. Increase the valve opening force from the valve closing force by maintaining the closed state of the water discharge valve 22 at the valve closing water level, and by applying the weight of the float 46 to the valve mechanism at the valve opening water level, There is a certain difference in the operation water level between the water level at the time of the valve closing operation and the water level at the time of the valve opening operation, and the opening and closing operation of the inorganic valve port 17 due to the water level displacement can be eliminated. Further, by providing the pressure adjusting means 2 on the primary side of the main body 1, the pressure adjusting means 2 prevents the primary pressure from increasing from a set value due to the occurrence of a water hammer, and eliminates a conventional valve opening defect. However, the main body 1 can be operated normally, and the water level in the water receiving tank can be maintained at the predetermined water level.

Further, since the pressure adjusting means 2 is provided integrally with the main body 1, the efficiency of the mounting work of the main body 1 can be improved.

The sealing member 26 provided between the piston 24 and the cylinder 20 releases the sealing function during the opening of the water discharge valve 22, thereby releasing the valve closing force acting on the piston 24. The fluid can be quickly and fully opened, and the pressure fluid can flow into the pressure chamber 27 by the communication between the pressure chamber 27 and the primary flow path 14. The sealing function of the sealing member 26 during the closing of the water discharge valve 22 allows the valve closing force due to the primary pressure to be applied, but the pressure fluid is sealed in the pressure chamber 27, Since the pressure is slightly leaked by the pressure discharge mechanism 28, the valve closing operation is gently displaced in accordance with the displacement of the piston 24 in the valve closing direction, and a water hammer due to the quick valve closing can be prevented.

The pressure discharge mechanism 28 is provided with a small gap by maintaining the stable closed state of the discharge valve 30 by means for urging the discharge valve 30 from the back side of the piston 24 in the valve closing direction. Thus, the speed of minute leakage of pressure by the discharge valve 30 sealing the discharge port 29 can be stabilized. Further, at the time of communication between the pressure chamber 27 and the primary side flow path 14, by means for opening the discharge port 29 with at least the water discharge valve 22 fully opened,
When the valve is opened or at the time of full opening, the discharge port 29 is opened, so that water scale and foreign matter attached to the piston 24, the discharge port 29, the discharge valve 30, and the like are forcibly discharged to the outside from the pressure chamber 27 together with the pressure fluid, Malfunctions due to adhesion of water scale and the like, particularly clogging of the discharge port 29 can be eliminated, and a minute leak of pressure by the discharge valve 30 can be maintained.

Further, since the pressure fluid flowing out of the pressure chamber 27 is discharged to the secondary side flow path 15, the scale in the pressure chamber 27 does not stop inside the discharge port 29 but is completely discharged to the outside. Its practical effect is extremely large, for example, it can be discharged to the public.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a water level differential ball tap.

FIG. 2 is a sectional view showing a fully closed state of a ball tap main body.

FIG. 3 is a cross-sectional view showing a state in which a ball tap main body is initially opened or immediately before closing a valve.

FIG. 4 is a sectional view showing a fully opened state of a ball tap main body.

[Explanation of symbols]

 1 Body 2 Pressure relief valve 14 Primary flow path 15 Secondary flow path 20 Cylinder 22 Water discharge valve 24 Piston 25 Valve rod 26 Seal member 27 Pressure chamber 28 Pressure discharge mechanism 29 Discharge port 30 Discharge valve 31 Connecting rod 32 valve Guide part 33 Spring 46 Float

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H059 AA05 BB05 BB14 CA05 CD05 EE01 FF02 3H066 AA01 BA05 BA18 EA01 EA08 3H068 AA01 BB22 BB32 BB43 BB53 BB73 BB81 EE16 EE20 FF20 GG02

Claims (5)

[Claims] 1. A main body having a water discharge valve receiving primary pressure in a valve opening direction, and a piston receiving a piston in a valve closing direction connected by a valve rod, and having a larger pressure receiving area of the piston than the water discharge valve. A water level differential type ball tap characterized in that said valve mechanism is connected to a float interlocking with the water level, and pressure adjusting means is provided on the primary side of the main body. 2. The water level differential type ball tap according to claim 1, wherein the pressure adjusting means is provided integrally with the main body. 3. A seal member is provided between the piston and its cylinder, and the seal member functions as a seal when the water discharge valve is closed and cancels the seal function when the water discharge valve is opened. The pressure chamber is provided on the side, and the pressure chamber is provided with a pressure discharge mechanism for allowing a slight leak of pressure during the sealing function, and the pressure chamber communicates with the primary side flow path when the seal is released. The water level differential type ball tap according to claim 1 or 2, wherein: 4. A pressure discharge mechanism includes a discharge port provided in the pressure chamber, a discharge valve for providing a small gap in a closed state to seal the discharge port, and moving the discharge valve in a valve closing direction from the back side of the piston. 4. The water level differential system according to claim 3, further comprising: a biasing means; and a means for opening a discharge port at least when the water discharge valve is fully opened when the pressure chamber communicates with the primary flow path. Ball tap. 5. The water level differential ball tap according to claim 3, wherein the pressure fluid flowing out of the pressure chamber is discharged to the secondary flow path.