JPH02266405A - Remote control system for set pressure of pressure control valve - Google Patents

Abstract

PURPOSE:To set up the pressure of pressure fluid to a required value by applying the elastic force of an adjusting spring to a diaphragm to set up the pressure of the pressure fluid and varying pressure in a pressure detecting room by an operation unit. CONSTITUTION:A valve port 8 is formed on a diaphragm 7 for dividing the inside of a valve box 2 into a primary pressure room 5 and a secondary pressure room 6, a valve body 26 for opening/closing the valve port 8 is fixed to the lower part of a valve shaft 25, the diaphragm 15 fixed to the upper part of the valve shaft 25 is divided into a control pressure room 11 and a pressure detecting room 16 through the upper part of the valve boxy 2 and a protection cylinder 14 and the pressure room 11 is connected to the primary or secondary pressure room 5 or 6 through a flowing route 12. On the other hand, the adjusting spring 23 for exciting the diaphragm 15 is arranged in the pressure detecting room 16 and the room 16 is connected to the operation unit 18. In the case of setting and changing the pressure of pressed fluid to a required value, the pressure in the pressure detecting room 16 is varied by the operation unit 18 to set up the required pressure of the pressed fluid.

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention provides remote control of the set pressure of a pressure control valve, which remotely controls the set pressure of a pressure control valve such as a pressure reducing valve or a pressure regulating valve. It's about systems.

Traditionally, in pressure control valves such as pressure reducing valves and pressure regulating valves, when changing the set pressure, the amount of compression of the adjusting spring is adjusted by rotating the adjusting screw back and forth to adjust the amount of compression of the adjusting spring, which acts on the diaphragm. The pressure of the pressure fluid was set by varying the elastic force and displacing the diaphragm up and down.

However, when such a pressure control valve is installed in a high place, a narrow place, etc., in order to adjust the set pressure,
It is difficult for workers to go and it takes time and effort to make adjustments.
In addition, especially in high places, such adjustment becomes a dangerous operation, and there is a risk of falling accidents.

The present invention relates to pressure control valves such as pressure reducing valves and pressure regulating valves.
When changing the pressure of a pressure fluid, we would like to provide a remote control system for the set pressure of a pressure control valve that can easily change the desired set pressure by varying the pressure applied to the diaphragm using a remote H operation. It is something to do.

[Structure of the Invention] In view of the above points, the present invention for the purpose of The valve body is attached to the lower part of the valve stem, and the diaphragm attached to the upper part of the cough valve stem is interposed between the upper part of the valve box and the protective cylinder to divide the control pressure chamber and the pressure detection chamber into a control pressure chamber and a pressure detection chamber. Pressure control is performed by communicating the pressure chamber 5 or the secondary pressure chamber through a flow path, and disposing an adjustment spring for biasing the diaphragm in the pressure detection chamber, and connecting the pressure detection chamber and the operation unit. The present invention aims to solve the above-mentioned drawbacks by providing a remote control system for valve setting pressure.

Moreover, the present invention sets the pressure of the pressure fluid by applying the elastic force of the adjustment spring to the diaphragm by adjusting the amount of compression of the adjustment spring, and when changing the pressure of the pressure fluid to a desired value, a remote By varying the pressure inside the pressure detection chamber using the operation unit, the desired pressure of the pressure fluid is set.

! An embodiment of the present invention will be described below based on the drawings. 1 is a main body of a pressure reducing valve which is a pressure control valve, and a primary side flow path 3 and a secondary side flow path 4 are provided on both sides of the valve N2. In addition to forming an opening, the inside of the valve box 2 is divided into a primary pressure chamber 5 and a secondary pressure chamber 6.
A valve port 8 is formed in the partition wall 7 that divides the cough valve port 8 into a secondary pressure chamber 6, and a valve seat 9 is provided around the secondary pressure chamber 6 side of the cough valve port 8. The control pressure chamber 1 is divided from the side pressure chamber 5 to form a control pressure chamber 1, and the control pressure chamber 11 and the secondary pressure chamber 6 are communicated through a flow passage 12. The numeral 14 to which 13 is screwed is a protection tube fixed to the upper part of the valve body 2 with a diaphragm 15 interposed therebetween.The inside of the protection tube 14 forms a pressure detection chamber 16. is connected to an operating unit 18 that controls pressure, such as a pressure reducing valve, which communicates with an inlet 17 formed in the side of the protective cylinder 14 and is connected to an air line.
The pressure inside the pressure detection chamber 16 is varied by the operation of the pressure detection chamber 16.

Reference numeral 19 denotes an adjusting screw screwed through the upper part of the protective cylinder 14 so as to be adjustable with a lock nut 20, and between an upper spring receiver 21 attached to the lower end of the adjusting screw 19 and a lower spring receiver 22 on the diaphragm 15. An adjustment spring 23 is compressed and interposed, and the upper part of the protective cylinder 14 is sealed with a cap 24.

Reference numeral 25 denotes a vertically slidable valve shaft inserted through the primary pressure chamber 5, secondary pressure chamber 6, and pressure detection chamber 16 of the valve box 2. A valve disk 27 is attached to and detached from the valve seat 9 of the valve port 8 through a valve disk 26 which is bulged opposite the port 8, and the valve disk 2G and the valve disk 27 are held by a disk retainer 28 and a naphof 29. The retainer guide 10 was inserted into the upper part of the valve shaft 25. A retainer 30 is fitted onto the outside, a diaphragm I5 is sandwiched in the upper part of the retainer 30, and the lower spring receiver 22 is fixed with a nand 31.

32.32a is the control pressure chamber 1 provided on the upper side of valve N2
1 is an air vent plug, 33 is an air vent valve provided on the top of the protective tube 14, 34 is an insertion hole drilled in the lid body 13, 35 is an O-ring attached to the retainer guide 10, and 36 is a retainer 3
3 is an O ring attached to the cover body; 38 is a cover gasket interposed between the protective tube 14 and the cap 24;

Next, another embodiment will be explained, omitting the parts that overlap with the previous embodiment. 6 to form a control pressure chamber 11, and the control pressure chamber 1
j and the primary side pressure chamber 5 are communicated through a flow path 12.

Further, a valve disc 27 is attached to the middle part of the valve shaft 25 and is attached to and detached from the valve seat 9 of the valve port 8 via a valve body 26 which is formed in a bulging manner to face the valve port 8. The valve disc 27 is fixed with a disc holder 28 and a NAND 29.

Next, the operation of the set pressure remote control system for a pressure control valve according to the present invention will be explained. The elastic force of the adjustment spring 23 acts on the upper surface of the diaphragm 15, and the pressure fluid flowing into the control pressure chamber 11 acts on the lower surface. As a result, the diaphragm 15 is displaced to balance both blades, and the valve body 26 adjusts the flow rate of the fluid. Adjust the pressure of spring 2
In this way, the pressure of the pressure fluid is set in advance by adjusting the compression amount of the adjustment spring 23 by moving the adjustment screw 19 back and forth in the axial direction, and the pressure of the pressure fluid is maintained at a value corresponding to the elastic force of 3. When changing the setting to a desired value, the desired pressure of the pressure fluid is set by remotely varying the pressure inside the pressure detection chamber 16 using the operating unit 8.

〔Effect of the invention〕

In short, the present invention forms the valve port 8 in the partition wall 7 that divides the inside of the valve box 2 into the primary pressure chamber 5 and the secondary pressure chamber 6, and connects the valve body 26 that opens and closes the valve port 8 to the valve shaft 25. A diaphragm 15 mounted below and above the valve shaft 25 is interposed between the upper part of the valve box 2 and the protection cylinder 14 to divide the control pressure chamber into a control pressure chamber and a pressure detection chamber. 11 and the primary pressure chamber 5 or the secondary pressure chamber 6 through the flow passage 2, and the adjustment spring 23 that biases the diaphragm 15 is connected to the pressure detection chamber 16.
Since the pressure detection chamber 16 and the operation unit 18 are connected to each other, when changing the pressure of the pressure fluid to a desired value, the operation unit 18 can be used remotely to change the pressure inside the pressure detection chamber 16. By varying the pressure, the desired pressure of the pressure fluid can be set, so even if the pressure control valve is installed in a high place or in a narrow place, the desired set pressure can be easily changed remotely. It is possible to do so.

Also, when changing the set pressure, diaphragm 1
Since the set pressure can be changed by combining the elastic force of the adjustment spring 23 applied to the control spring 5 and the pressure control of the operation unit 18, the air pressure of the operation unit 8 can be kept at a low pressure, exceeding the setting range of the adjustment spring 23. It also has great practical effects, such as being able to set the pressure.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a diagram showing a set pressure remote control system for a pressure control valve according to the present invention, and FIG. 2 is a diagram showing another embodiment. 2 Valve box 5 - Outlet pressure chamber 6 Outlet pressure chamber 7 Interval 9
8 Valve port 11 Control pressure chamber 12 Flow path 14
Protection points 15 diaphragm 16 pressure detection chamber 18 operation unit 23 adjustment spring 25 valve shaft 26 valve bodies or more Applicant Yoshitake Seisakusho Co., Ltd.

Claims (1)

[Claims] A valve port is formed in the partition wall that divides the inside of the valve box into a primary pressure chamber and a secondary pressure chamber, and a valve body for opening and closing the valve port is installed below the valve shaft, and is mounted above the valve shaft. The diaphragm is interposed between the upper part of the valve box and the protective cylinder to divide it into a control pressure chamber and a pressure detection chamber, and the control pressure chamber and the primary pressure chamber or the secondary pressure chamber are communicated through a flow path, or A set pressure remote control system for a pressure control valve, characterized in that an adjustment spring for biasing a diaphragm is disposed within a pressure detection chamber, and the pressure detection chamber is connected to an operation unit.