JPS5840066B2 - Open/close valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an on-off valve device that opens and closes a valve body using the pressure of a fluid whose opening and closing are to be controlled.

Generally, in this type of on-off valve device, a pressure receiving body is attached to the valve shaft of the valve body, and this pressure receiving body is slidably housed in a pressure receiving body housing chamber in a fluid-tight manner, and a fluid flows into the pressure body housing chamber to control opening and closing. It is configured to introduce pressure from the side and apply this pressure to the pressure receiving body to open and close the valve body.

Various specific configurations of such on-off valve devices have been developed depending on the application and the like.

For example, in an on-off valve device for water supply, an inflow chamber on the inflow side and an outflow chamber on the outflow side are formed in the valve body, and the valve body is connected from the inflow chamber side to the valve port that communicates the inflow chamber and the outflow chamber. There is one in which a person is seated.

A pressure-receiving body is provided on the valve shaft of this valve body, and a pressure-receiving body chamber is formed to accommodate the pressure-receiving body. A pressure-dropping orifice is provided in the second pressure-dropping passage, which communicates with the inlet chamber through the first pressure-pulling passage and the second pressure-pulling passage, and which communicates with the other chamber. A pressure passage is formed, and this pressure relief passage is configured to communicate with the outflow chamber side via a small control valve.

In such a device, when the control on-off valve is closed, the pressure in the inflow chamber is introduced into both chambers of the pressure receiving body chamber through the first pressure impulse passage and the second pressure impulse passage, and the pressure is introduced into both chambers of the pressure receiving body chamber. The pressure acting on the valve body becomes the same pressure and is balanced, and the pressure of the inflow chamber acting on the back side of the valve body causes the valve body to sit on the valve port and become in a closed state.

When the control valve is opened, the water in the inflow chamber flows to the outflow chamber through the pressure drop orifice of the second pressure impulse passage and the pressure release passage, and the pressure is lowered by this pressure drop orifice, causing the pressure to drop to the pressure receiving body. The pressure in the other chamber of the storage chamber becomes low, and a difference occurs in the pressures acting on both sides of the pressure receiving body.

This differential pressure causes the pressure receiving body to move, pulling the valve body away from the valve port and opening the valve.

In such a valve, the valve body is seated from the inflow chamber side, so the valve stem naturally protrudes toward the inflow chamber side, and the pressure receiving body chamber that accommodates the pressure receiving body attached to this valve stem is also located on the inflow chamber side. be done.

Therefore, the first
The configurations of the pressure guiding passage and the second pressure guiding passage are also simplified.

Furthermore, since both chambers of this pressure receiving body chamber are communicated with the inflow chamber, the valve shaft insertion portion is inserted between the pressure receiving body and the circumferential surface of the pressure receiving body chamber and through the pressure receiving body chamber. It has the advantage that there is no problem at all even if there is some leakage in the sliding parts.

However, in such a valve, the valve body opens and closes depending on the balance between the water pressure acting on the pressure receiving body and the valve body, and therefore, the valve body may suddenly become seated, resulting in water hammer.

In order to prevent this, a flow control orifice is provided in the second pressure passage downstream of the branching part of the pressure relief passage, and the flow from the second pressure passage to the other chamber of the pressure receiving chamber is It has been considered to prevent the valve body from suddenly seating by restricting the flow rate of outflowing water and regulating the moving speed of the pressure receiving body.

However, if this is done, for example, the O-ring attached to the outer periphery of the pressure receiving body wears out due to long-term use, and if leakage between the pressure receiving body and the inside of the pressure receiving body chamber increases, the control A problem occurs in which the valve body does not open even when the on-off valve is opened.

That is, since the flow rate control orifice described above controls the flow rate of a small amount of water pushed out from the other chamber of the pressure receiving body storage chamber, its diameter is extremely small.

Therefore, if leakage occurs between the outer periphery of the pressure receiving body and the inside of the pressure receiving body chamber, when the control on-off valve is opened and the pressure in the second pressure passage becomes low, one of the chambers of the pressure receiving body chamber will leak. A significant amount of leakage occurs in the other chamber, and this leaked water flows through the flow control orifice and into the pressure relief passage.

When a considerable amount of water flows through such a small-diameter flow rate control orifice, a large pressure difference is generated between the upstream and downstream sides, so the control valve is opened to reduce the pressure inside the second pressure passage. Even if the pressure becomes low, the pressure on the upstream side of this flow rate control orifice, that is, the pressure in the other chamber of the pressure receiving body chamber, does not decrease, and therefore the pressure difference acting on both sides of the pressure receiving body cannot be obtained enough, and the valve body is forced to close to the valve seat. It was something that could not be separated from him.

The present invention has been made based on the above-mentioned circumstances, and its purpose is to accommodate a pressure receiving body for accommodating a valve body seated at a valve port from the inflow chamber side and a pressure receiving body attached to the valve shaft of this valve body. To obtain an opening/closing valve device in which the pressure of an inflow chamber is introduced into chambers on both sides of the chamber, in which the opening/closing operation of a valve body is not hindered even if some leakage occurs in the sliding part of a pressure receiving body. It is in.

That is, the configuration of the present invention includes a valve body, an inflow chamber and an outflow chamber on the fluid inflow side formed in the valve body, a valve port that communicates the inflow chamber and the outflow chamber, and the above-described valve port. A valve body that is seated from the inflow chamber side, a pressure receiving body attached to the valve shaft of this valve body, a pressure receiving body housing chamber that slidably accommodates this pressure receiving body in a liquid-tight or airtight manner, and the pressure receiving body A first pressure guiding passage communicates one chamber of the pressure receiving body storage chamber divided into two chambers with the inflow chamber, and a pressure reducing orifice connects the other chamber of the pressure receiving body storage chamber and the inflow chamber. a second pressure impulse passage that communicates with the other chamber of the pressure-reducing orifice and the other chamber of the pressure-receiving body chamber; and a pressure relief passage communicating with the outflow chamber side, wherein the pressure relief passage is provided in the second pressure passage between a branch part of the pressure relief passage and the other chamber of the pressure receiving body storage chamber. It is equipped with a flow rate control orifice and a check valve that is provided in parallel with the flow rate control orifice and allows flow only in the direction from the other chamber of the pressure receiving body chamber toward the pressure relief passage.

Therefore, this flow rate control orifice regulates the amount of flow toward the other chamber in the pressure-receiving body chamber, prevents the valve body from suddenly seating, and prevents the occurrence of water hammer or the like.

In addition, when the valve is opened, even if a leak occurs between the pressure receiving body and the pressure receiving body housing chamber and leakage occurs in the other chamber, the check valve will open and the leaked fluid will be transferred to the second passage. Since the pressure in the other chamber does not increase, the valve body can be opened reliably.

Next, an embodiment of the present invention will be described with reference to the drawings.

In the figure, 1 is the valve box body.

The valve box main body 1 is formed with an inflow chamber 2 on the side where water flows in and an outflow chamber 3 on the side where water flows out. ing.

A valve body 5 is configured to be seated on this valve port 4 from the inflow chamber 2 side.

Further, a circular threaded portion 6 is formed on the upper surface of the valve body body 1 on the inflow chamber 2 side, and this threaded portion 6 communicates with the inflow chamber 2 and has a threaded thread 7 on its inner peripheral surface. is formed.

A top cover 8 is screwed onto this threaded portion 6.

This upper lid is formed with a cylindrical main body part 9 whose lower surface is open, and a threaded collar part 10 that protrudes integrally from the lower edge of this main body part, and this threaded collar part 10 is screwed into the threaded part 6. ing.

A shallow dish-shaped inner lid 11 is screwed into the lower end opening of the main body portion 9 of the upper lid 80.

A cylindrical pressure receiving body housing chamber 12 is formed by the main body portion 9 of the upper lid and this inner lid 11.

The inner lid 11 is formed to have a smaller diameter than the inner diameter of the threaded portion 6, and therefore a gap 13 is formed between the outer periphery of the inner lid 11 and the inner periphery of the threaded portion 6.

A valve shaft insertion hole 14 is formed in the center of the inner lid 11, and the valve shaft 15 of the valve body 5 slidably passes through the valve shaft insertion hole 14 and enters the pressure receiving body chamber 12. It has been inserted.

A disk-shaped pressure receiving body 16 is provided at the tip of the valve shaft 15.
is attached, and this pressure receiving body 16 is installed in the pressure receiving body storage chamber 1.
This pressure receiving body 1 is slidably fitted into the inner circumferential surface of
An OIJ song 7 is provided on the outer periphery of the pressure receiving body chamber 12 to ensure liquid tightness between the pressure receiving body chamber 12 and the inner circumferential surface of the pressure receiving body chamber 12 .

The lower surface of the inner lid 11 has first pressure holes 1B and 18.
are formed, and the inflow chamber 2 and one chamber 12a of the pressure receiving body housing chamber 12 divided into two chambers by the pressure receiving body 16, that is, the chamber on the valve body 5 side, communicate with each other through the first pressure guiding holes is and is. ing.

One-way throttle valves 19, 19 are screwed into these first pressure guiding holes 18, 18, respectively.

These one-way throttle valves 19, 19 have a valve body 2 that functions as a check valve.
A small-diameter orifice hole 21.21 is formed in the holes 0 and 20, and the flow from the inflow chamber 2 toward one chamber 12a of the pressure receiving chamber 12 is freely allowed, and the flow in the opposite direction is allowed to flow through the orifice hole 21. .21 and its flow rate is restricted.

Further, a second pressure guiding passage 22 is formed in the upper lid 8 .

One end of this second pressure passage 22 opens between the inner circumferential surface of the threaded part 6 on the lower surface of the upper cover 8 and the outer circumferential surface of the inner cover 11 via a pressure-dropping orifice 23 and communicates with the inflow chamber 2. ing.

Further, the other end of the second pressure guiding passage 22 communicates with the other chamber 12b of the pressure-receiving body chamber 12, that is, the chamber on the opposite side to the valve body 5 side, via a small-diameter flow rate control orifice 24.

A check valve 25 is provided bypassing this flow rate control orifice 24, that is, in parallel with it, and this check valve 25 is directed from the other chamber 12b of the pressure receiving body chamber 12 to the second pressure guiding passage 22. It is configured to allow only directional flow.

Further, a pressure relief passage 26 is formed by branching from an intermediate portion of the second pressure guiding passage 22, that is, a portion between the pressure drop orifice 23 and the flow rate control orifice 24.

This pressure relief passage 26 is connected to a pipe 28 connected to the outflow chamber 3 side, for example, the outflow chamber 3 side, via a small control valve 27.

Further, a small-diameter communication orifice 29 is formed in the pressure receiving body 16, and one chamber 12a and the other chamber 12b of the pressure receiving body storage chamber 12 are communicated with each other through this communication orifice 29.

In one embodiment of the present invention configured as described above, when the control on-off valve 27 is closed, the pressure in the inflow chamber 12 is transmitted through the first pressure-pulling holes 18, 18 and the second pressure-pulling passage 22. It is introduced into both chambers 12a, 12b of the pressure receiving body storage chamber 12, and both chambers 12a.

The pressure inside 12b becomes the same pressure, and the pressures acting on both sides of the pressure receiving body 16 are balanced, and the inflow chamber 2 acting on the back side of the valve body 5
The pressure causes the valve body 5 to sit on the valve port 4, and the valve is in a closed state.

Then, when the control on-off valve 27 is opened, water in the inflow chamber 2 flows to the outflow chamber 3 side through the pressure-reducing orifice 23, the second pressure guiding passage 22, and the pressure relief passage 26.

Therefore, when the water flows through the pressure drop orifice 23, a pressure drop occurs, and the downstream side of the pressure drop orifice 23 has a lower pressure.

Therefore, a difference occurs in the pressure acting on both sides of the pressure receiving body 16, and this pressure difference pushes up the pressure receiving body 16, and the valve body 5
is pulled away from the valve port 4 to open the valve.

When the valve is opened, water from the inflow chamber 12 pushes up the valve bodies 20 and 20 of the one-way throttle valves 19, 19, flows into one chamber 12a of the pressure receiving chamber 12, and also flows into the pressure receiving chamber 12a. The water in the other chamber 12b of 12 flows through the flow rate control orifice 2.
4 from the second pressure passage 22 to the pressure relief passage 26.

Further, during or after opening the valve, water flows from one chamber 12a of the pressure receiving body storage chamber 12 to the other chamber 12b through the communication orifice 29 of the pressure receiving body 16, and water flows through the communication orifice 29 of the pressure receiving body 16.
If the 01J ring 17 of No. 6 is worn out and leakage occurs, this leakage causes the leakage to occur from one chamber 12a to the other chamber 12a.
Water flows to b.

The water flowing from one chamber 12a to the other chamber 12b passes through the flow rate control orifice 24 and enters the second pressure passage 22.
from there to the pressure relief passage 26.

When water flows through this flow rate control orifice 24, a pressure drop occurs, and the pressure decreases in the other chamber 12 of the pressure receiving chamber 12.
The pressure in b becomes higher than the pressure in the second pressure passage 22.

However, since a check valve 25 is provided in parallel with this flow rate control orifice 24, when the pressure in the other chamber 12b of the pressure receiving chamber 12 becomes high, this check valve 25 opens.
Water in this other chamber 12b flows into the second pressure passage 22.

Therefore, even if a large amount of water leaks from one chamber 12a to the other chamber 12b, the pressure in the other chamber does not increase, and the valve body 5 can be reliably opened and closed.

Further, the pressure receiving body 16 is provided with a communication orifice 29, and even when there is no leakage from the 01J ring 17 of the pressure receiving body 16, a certain amount of water flows from one chamber 12a to the other chamber 12b. The effect of the amount of leakage from the ring 17 etc. on the operation of the valve body 5 is small.

In other words, when such a communication orifice 29 is not formed, the amount of water leaking from one chamber 12a to the other chamber 12b is zero when there is no wear on the 01J ring 1T, and the amount of water leaking from one chamber 12a to the other chamber 12b is zero. If this occurs, a certain amount of water will leak from one chamber 12a to the other chamber 12b, so that the ratio between the minimum and maximum leakage amounts will be very large.

Therefore, it is difficult to set the flow rate of the flow rate control orifice 24 and the check valve 25 in response to such a large leakage amount with a large minimum to maximum ratio. A large difference occurs in valve opening speed, etc.

However, if the communication orifice 29 is provided like this, 0
A certain amount of water always flows from one chamber 12a of the pressure receiving chamber 12 to the other chamber 12 regardless of whether or not there is a leak in the 1J ring 17.
Since it flows to b, the operating speed of the valve body 5 is stabilized.

Then, when the control on-off valve 27 is closed, the second pressure guiding passage 22
The water flowing from the inflow chamber 2 through the pressure relief passage 26 to the outflow chamber 3 side stops, and the pressure in the inflow chamber 2 increases to the first pressure guiding holes 18, 1B and the second
Through the pressure guiding passage 22, the pressure receiving body storage chamber 120 and both chambers 12
a, 12b.

Therefore, the pressure acting on both sides of the pressure receiving body 16 is
The pressure in the inflow chamber 2 acting on the back surface of the valve body 5 causes the valve body 5 to sit on the valve port 4 and become closed.

When the valve body 5 is seated, the water in one chamber 12a of the pressure body storage chamber 12 is pushed out into the inflow chamber 2 through the one-way throttle valve 19, 19 by the lowering of the pressure body 16.

In this case, the valve bodies 20, 20 of the one-way throttle valves 19, 19 are seated, and water flows through the orifices 21, 21 of these valve bodies 20, 20,
21, the downward speed of the pressure receiving body 16 is regulated.

Further, as the pressure receiving body 16 descends, water in the inflow chamber 2 flows into the other chamber 12b of the pressure receiving body storage chamber 12 through the second pressure guiding passage 22, but at this time, the check valve 25 closes, so that the water flows at a flow rate. The flow rate is regulated through the control orifice 24, and the downward speed of the pressure receiving body 16 is regulated.

Therefore, the valve body 5 is prevented from suddenly seating and causing water hammer or the like.

Note that the present invention is not limited to the above embodiment.

For example, it is not always necessary to provide a one-way throttle valve in the first pressure guiding hole, and simply providing a flow rate control orifice in the second pressure guiding passage can sufficiently prevent the valve body from suddenly seating.

Further, the pressure receiving body does not necessarily need to be provided with a communication orifice.

Furthermore, the configurations of the valve box body and the pressure receiving body chamber are not necessarily limited to those described above.

Furthermore, the present invention is applicable not only to on-off valve devices for water supply but also to other on-off valve devices.

As described above, the present invention provides a valve body, an inflow chamber and an outflow chamber on the fluid inflow side formed in the valve body, a valve port that communicates the inflow chamber and the outflow chamber, and a valve port that communicates the inflow and outflow chambers. A valve body seated from the chamber side, a pressure receiving body attached to the valve stem of this valve body, a pressure receiving body housing chamber that slidably accommodates this pressure receiving body in a liquid-tight or airtight manner, and the pressure receiving body 2
A first pressure guiding passage communicates one chamber of the pressure receiving body storage chamber divided into chambers with the inflow chamber, and the other chamber of the pressure receiving body storage chamber and the inflow chamber are connected through a pressure-reducing orifice. and a second pressure impulse passage communicating with the other pressure receiving chamber, and a control opening/closing valve provided branching from the second pressure impulse passage between the pressure drop orifice and the other chamber of the pressure receiving body storage chamber. and a pressure relief passage communicating with the outflow chamber side, the flow rate control provided in the second pressure passage between the branch part of the pressure relief passage and the other chamber of the pressure receiving body storage chamber. and a check valve that is provided in parallel with the flow rate control orifice and allows flow only in the direction from the other chamber of the pressure receiving chamber to the pressure relief passage.

Therefore, the flow rate of the fluid flowing into the other chamber of the pressure receiving body chamber is regulated by this flow rate control orifice, and it is possible to prevent the valve body from suddenly seating and water hammer etc. Even if a leak occurs between the pressure receiving body and the inside of the pressure receiving body housing chamber and fluid flows from one chamber to the other, the above-mentioned check valve opens and allows this fluid to flow into the second pressure passage. The effect of this is that the pressure in the chamber does not rise and the valve body can be opened and closed reliably.

[Brief explanation of the drawing]

The drawing is a longitudinal sectional view of an embodiment of the present invention. 1...Valve box body, 2...Inflow chamber, 3.
...Outflow chamber, 4...Valve port, 5...
・Valve body, 6...Threaded part, 8...Top lid,
11... Inner lid, 12... Pressure receiving body housing chamber, 15... Valve stem, 16... Pressure receiving body, 1
8...First pressure hole (first pressure path), 22...
...Second pressure impulse passage, 23...Orifice for pressure drop, 24...Orifice for flow rate control, 2
5... Check valve, 26... Pressure relief passage, 2
7... Control valve.

Claims (1)

[Claims] 1. A valve box main body, an inflow chamber and an outflow chamber on the fluid inflow side formed in the valve box main body, a valve port that communicates these inflow chambers and the outflow chamber, and a valve seat that is seated on this valve port from the inflow chamber side. A valve body, a pressure receiving body attached to the valve stem of the valve body, a pressure receiving body housing chamber that slidably accommodates this pressure receiving body in a liquid-tight or airtight manner, and a pressure receiving body divided into two chambers by the pressure receiving body. a first pressure guiding passage that communicates one of the pressure receiving chambers with the inflow chamber; and a first pressure passage that communicates the other chamber of the pressure receiving chamber with the inflow chamber via a pressure-reducing orifice. a second pressure impulse passage, and a second pressure impulse passage branched from the second pressure impulse passage between the pressure drop orifice and the other chamber of the pressure receiving body storage chamber, and connected to the outflow chamber side via a control on-off valve. a flow rate control orifice provided in the second pressure passage between a branch of the pressure relief passage and the other chamber of the pressure receiving body storage chamber; An on-off valve device comprising: a check valve that is provided in parallel with the flow rate control orifice and allows flow only in a direction from the other chamber of the pressure receiving body chamber toward the pressure relief passage.