JPH05240361A - Pressure regulating valve - Google Patents

Abstract

PURPOSE:To provide self-sealing effect by carrying out maintenance of a rubber sleeve type pressure requlating valve, easily in a short period of time. CONSTITUTION:Slits 11, 12 are provided separately in the vertical axial direction on a tapered circumferential wall 9 of a basket 8 which is reduced in the diameter as it goes upward, and a primary side of a fluid is connected to the upper slit 11 and a secondary side is connected to the lower slit 12 in a separated manner in the basket 8, and a rubber sleeve 13, which is formed into an inner shape slightly smaller than an external shape of the basket 8, and which is tapered with the upper end closed, is externally installed in the outside of the basket 8, while a pilot pressure chamber 16 surrounding the outer periphery of the rubber sleeve 13 is formed on the inside of a cover 14 coating the outside of the basket 8. When the secondary side pressure is high, the rubber sleeve 13 is adhered to the outer periphery of the basket 8, and a closed valve condition is provided where the communication of the upper and lower slits 11 and 12 is cut. When the secondary side pressure is reduced, the rubber sleeve 13 is pressed open by the primary side pressure, and a valve open condition is provided, where both of the slits 11 and 12 are communicated together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber sleeve type pressure regulating valve which opens and closes in response to fluctuations in secondary side pressure, and more specifically, has a large fluid passage area and which is capable of controlling the inflow and outflow directions of fluid. The present invention relates to a pressure control valve that can be taken in the same direction and can be maintained without removing it from a pipeline.

[0002]

2. Description of the Related Art As a pressure adjusting valve for opening and closing in response to fluctuations in the secondary pressure of a fluid to adjust the secondary pressure, a rubber sleeve type as shown in Japanese Patent Publication No. 49-35295 or a special pressure adjusting valve is used. The diaphragm type shown in Kaisho 61-175376 has been proposed.

[0003]

By the way, the former rubber sleeve type pressure regulating valve has a relative axial direction of inflow and outflow of fluid, and is of a wafer type which is directly installed in a pipeline. It is necessary to remove all the pressure control valves from the pipeline at times such as when doing so, the work is complicated and burdens the entire piping system. There is a problem of calling.

The latter diaphragm type pressure regulating valve has the advantage that maintenance can be performed without removing the valve body from the pipeline, but on the other hand, it has a smaller fluid passage capacity than the rubber sleeve type and has a better sealing performance. However, there is a problem that the self-sealing effect cannot be expected because the shrinkability of rubber itself cannot be used.

Therefore, according to the present invention, although the rubber sleeve type is used, the entire maintenance can be carried out without removing it from the pipeline, the fluid passage capacity is large, the self-sealing effect is provided, and the characteristics of the rubber sleeve type can be utilized. The challenge is to provide a regulating valve.

[0006]

In order to solve the above problems, the present invention provides slits axially separated on a tapered peripheral wall of a basket surrounded by pilot pressure chambers. In which the primary side of the fluid is connected to one of the slits axially separated from each other and the secondary side of the fluid is connected to the other side, and an inflatable tapered rubber sleeve, one of which is closed, is attached to the outside of the basket. Is adopted.

[0007]

[Function] When the pressure in the pilot pressure chamber is equal to the pressure of the primary side fluid, the rubber sleeve is in close contact with the outer peripheral surface of the basket and closes the slits separated in the axial direction, and the primary side fluid flows out to the secondary side. Not closed The valve is closed.

When the pressure in the pilot pressure chamber decreases due to the decrease in the secondary side pressure, the rubber sleeve is pushed open by the pressure of the primary side fluid, and both slits communicate with each other in the rubber sleeve. When the fluid flows out to the secondary side through both slits and the pressure in the pilot pressure chamber rises to the primary side pressure due to the increase in the secondary side pressure, the rubber sleeve is in a valve closed state in which it is in close contact with the basket.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the valve body 1 is formed in a double structure in which a primary side inlet pipe 3 using a 90 ° elbow is incorporated in a secondary side outlet pipe 2 using a T-shaped pipe. The lower portion of the outflow pipe 2 serves as an outflow port 4 and the side portion serves as an inflow port 5, and the outflow port 4 and the inflow port 5 are connected to a pipeline by flanges 6 and 7, respectively.

A basket 8 installed on the valve body 1
The cylindrical peripheral wall 9 is formed in a tapered shape with a small diameter at the upper end, the upper end is closed, and a flange 10 is provided around the lower outer periphery, and the peripheral wall 9 is vertically arranged with a central portion in the vertical direction as a boundary. Separated slits 11 and 12 are provided.

The slits 11 and 12 are formed in the basket 8
It is long along the up-down axis direction and is provided over the entire circumferential surface at regular intervals in the circumferential direction of the peripheral wall 9 as shown in FIG.

The rubber sleeve 13 which is fitted on the outside of the basket 8 has a structure in which a protrusion 13a for retaining is provided around the lower end of a tapered peripheral wall whose upper end is closed in a folded manner. The inner shape of the basket 8 is slightly smaller than the outer shape of the basket 8.
The self-sealing effect with respect to the slits 11 and 12 is exhibited.

A cover 14 covering the outside of the basket 8.
Is provided with a flange 15 on the outer circumference of the lower part, and an inner peripheral wall forms a pilot pressure chamber 16 between the peripheral wall of the rubber sleeve 13 and a pilot pressure inlet 17 communicating with the pilot pressure chamber 16 in the middle of the peripheral wall. There is.

The cover 14 is fixed to the upper end of the secondary side outflow pipe 2 by the flanges 15 and 18 by connecting a bolt 19 so that the flange 10 of the basket 8 and the projection 13a of the rubber sleeve 13 overlap each other. It is clamped between 18 and 18.

An upper end extension portion 3a extending above the primary side inflow pipe 3 is provided at a substantially central portion of the basket 8 and has a vertical slit 1a.
The outer periphery of the upper end is fitted and fixed in a watertight manner at the position of the boundary between 1 and 12. Therefore, the upper slit 11 communicates with the primary side and the lower slit 12 communicates with the secondary side.

The pressure regulating valve of the present invention has the above-mentioned structure, and its operation will be described with reference to FIGS. 2 and 3.

As shown in FIG. 2, the primary side 21 and the secondary side 22 of the pipeline are connected to the inflow port 5 and the outflow port 4, and the primary side 2
A pilot governor 24 and an orifice 25 are provided in the middle of a control path 23 connecting the primary side 22 and the secondary side 22, and the pilot governor 24 and the orifice 25 of the control path 23 are connected to the pilot pressure inlet 17.

FIG. 2 shows the state when the valve is closed. The pilot governor 24 is closed due to the pressure increase on the secondary side 22, the pressure fluid on the primary side 21 flows into the pilot pressure chamber 16 through the orifice 25, and the rubber Due to the differential pressure between the pressure acting on the outer peripheral wall of the sleeve 13 and the secondary pressure acting on the inner circumference of the rubber sleeve 13 from the lower slit 12, the rubber sleeve 13 contracts to press the outer surface of the basket 8. , The slits 11 and 12 are closed. Therefore, there is no outflow of the primary side fluid to the secondary side, and the left half of FIG. 1 shows this valve closed state.

Next, when the pressure on the secondary side 22 decreases, the pilot governor 24 opens and the pilot pressure chamber 16
When the working pressure in the inner side flows out to the secondary side 22 and the pressure in the pilot pressure chamber 16 decreases, the rubber sleeve 13 is covered by the primary side pressure acting on the inside of the rubber sleeve 13 at the upper slit 11 side. As a result, the rubber sleeve 13 is opened from the outer surface of the basket 8 as shown in FIG. 3, and the primary side fluid flows from the upper slit 11 to the lower slit 12 through the inside of the rubber sleeve 13. The right half of FIG. 1 shows the valve open state, and the primary side fluid flows out to the secondary side 22.

When the pressure on the secondary side 22 rises, the pilot governor 24 closes, the primary side pressure is supplied from the orifice 25 into the pilot pressure chamber 16, and the rubber sleeve 13 contracts by the primary side pressure and itself to the outer surface of the basket 8. Is pressed against the valve to close the valve and stop the outflow of the primary side fluid.

In the embodiment, the upper slit 11 is on the primary side and the lower slit 12 is on the secondary side, but the inflow and outflow directions of the fluid may be reversed.

[0023]

As described above, according to the present invention, the inflow and outflow directions of the fluid can be made the same direction, and the rubber sleeve can be replaced by simply removing the cover at the time of maintenance, so that maintenance can be performed easily and in a short time. Become.

Further, maintenance can be performed without removing the valve main body from the pipeline, and there is no leakage from the piping section.
High safety.

Further, since the tapered rubber sleeve is adopted, the passage capacity of the fluid is increased and at the same time, there is a self-sealing effect by utilizing the contractibility of the rubber itself.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a pressure regulating valve of the present invention.

FIG. 2 is an operation explanatory diagram showing a valve closed state of the above.

FIG. 3 is an operation explanatory view showing a valve open state in the same manner.

FIG. 4 is a transverse plan view of the basket.

[Explanation of symbols]

 1 Valve Main Body 2 Secondary Side Outflow Pipe 3 Primary Side Inflow Pipe 8 Basket 9 Circumferential Walls 11, 12 Slit 13 Rubber Sleeve 14 Cover 16 Pilot Pressure Chamber

Claims (1)

[Claims] 1. A slit is axially separated on a tapered peripheral wall of a basket surrounded by a pilot pressure chamber, and one of the slits axially separated in the basket has the primary side of the fluid on the other side. A pressure regulating valve in which a secondary side of the fluid is connected to the inside of the basket, and an inflatable tapered rubber sleeve, one of which is closed, is attached to the outside of the basket.