CN212407743U

CN212407743U - Pneumatic regulating valve

Info

Publication number: CN212407743U
Application number: CN202021229094.7U
Authority: CN
Inventors: 范忠祥
Original assignee: Shanghai Fanshi Automation Control Equipment Co ltd
Current assignee: SHANGHAI MOSO VALVE Co.,Ltd.
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2021-01-26
Anticipated expiration: 2030-06-29

Abstract

The utility model discloses a pneumatic regulating valve, which comprises a valve body, a lower valve cover, an upper valve cover and a valve core component, wherein a valve seat is arranged in the valve body, the lower valve cover is arranged at the upper end of the valve body, the upper valve cover is fixedly covered on the lower valve cover, the valve core component comprises a membrane, a valve rod, a valve clack and a pressure spring, the membrane vertically divides a hollow cavity between the upper valve cover and the lower valve cover into an upper control cavity and a lower control cavity, the middle area of the membrane is connected with a membrane seat, the valve rod passes through the lower valve cover, the upper end of the valve rod is connected with the membrane seat, the valve clack is connected with the lower end of the valve rod, the pressure spring is sleeved on the valve rod and supported between the lower valve cover and the membrane seat, the upper part of the lower valve cover is provided with an upper air inlet and an upper air outlet, the lower exhaust port is connected with a pressure relief valve. The utility model discloses a leakproofness is good, can fundamentally stop liquid leakage.

Description

Pneumatic regulating valve

Technical Field

The utility model relates to a chemical industry valve technical field, concretely relates to pneumatic control valve.

Background

The pneumatic regulating valve uses compressed gas as a power source, uses a cylinder as an actuator, drives a valve by means of accessories such as a valve positioner, a converter, an electromagnetic valve, a position-retaining valve, a gas storage tank, a gas filter and the like, realizes switching value or proportional regulation, and receives a control signal of an industrial automatic control system to regulate various technological process parameters such as flow, pressure, temperature, liquid level and the like of a pipeline medium.

In petrochemical industry, the leakproofness requirement of the valve to the valve that is used for poisonous and harmful liquid is very high, and current pneumatic control valve generally includes valve body, upper valve cap and cylinder, and the valve rod is worn out from upper valve cap in the valve body, and the cylinder links to each other with the valve rod to be used for driving valve switch, and it is sealed through the filler between upper valve cap and the valve rod, and the above-mentioned structure can't realize the full-seal of valve, takes place liquid leakage easily between upper valve cap and the valve rod.

SUMMERY OF THE UTILITY MODEL

To the defect among the prior art, the utility model provides a pneumatic control valve that the leakproofness is good, can fundamentally stop liquid leakage.

The utility model provides a pneumatic control valve, include: the valve comprises a valve body, a valve rod cavity and a medium outflow channel, wherein the valve body is internally provided with the medium inflow channel, the valve rod cavity and the medium outflow channel; the lower valve cover is arranged at the upper end of the valve rod cavity and fixedly connected with the valve body, and a guide hole is formed in the center of the lower valve cover; the upper valve cover is fixedly covered on the lower valve cover, and a hollow cavity is formed between the upper valve cover and the lower valve cover; the valve core assembly comprises a diaphragm, a valve rod, a valve clack and a pressure spring, the edge of the diaphragm is clamped between the upper valve cover and the lower valve cover, a hollow cavity between the upper valve cover and the lower valve cover is vertically divided into an upper control cavity and a lower control cavity by the diaphragm, the middle area of the diaphragm is connected with a diaphragm seat, the valve rod penetrates through the guide hole, the upper end of the valve rod is connected with the diaphragm seat, the valve clack is matched with the valve seat, the valve clack is connected to the lower end of the valve rod, and the pressure spring is sleeved on the valve rod and supported between the lower valve cover and the diaphragm seat; the upper portion of lower valve gap is equipped with last inlet and last inlet, the lower part of lower valve gap is equipped with air inlet and lower outlet down, go up the inlet and link to each other with the air supply, go up the inlet and link to each other through the bypass line between the air inlet down, it has the bypass valve to establish ties on the bypass line, the air outlet is connected with the relief valve down.

Furthermore, an annular groove is formed in the side wall of the guide hole, a packing cavity is formed between the annular groove and the valve rod, and sealing packing is filled in the packing cavity.

Furthermore, the upper end of the annular groove penetrates through the upper surface of the lower valve cover, and a gland pressed on the upper side of the sealing packing is fixed on the upper side of the lower valve cover through screws.

Further, the diaphragm seat includes punch holder and lower plate, punch holder and lower plate clamp are in the both sides of diaphragm, the upper end of valve rod is equipped with the connector, go up the connector and pass lower plate, diaphragm and punch holder in proper order, and it has the nut to screw up the upper end of connector, punch holder, diaphragm and lower plate press from both sides tightly between the upper end of valve rod and the nut.

Further, the lower valve cover and the valve body are fixed through bolts.

Further, the upper valve cover and the lower valve cover are fixed through bolts.

Further, the air source is an air pump.

Further, the bypass valve is a ball valve.

Further, a sealing ring is arranged at the bottom of the valve clack, and the valve clack can be in sealing connection with the valve seat through the sealing ring.

Further, the bottom of valve clack is equipped with the annular groove, the sealing washer install in the annular groove, the bottom of valve clack still is fixed with the clamping ring through the screw, the sealing washer passes through the clamping ring is fixed in the annular groove.

The beneficial effects of the utility model are embodied in: when the pneumatic regulating valve is closed, the bypass valve is firstly closed, compressed air is introduced into the upper control cavity through the upper air inlet, the compressed air pushes the diaphragm seat, the valve rod and the valve clack to move downwards until the valve clack is tightly abutted against the valve seat, and air in the lower control cavity is extruded in the process that the diaphragm seat moves downwards. When the pneumatic regulating valve is opened, firstly, the air source is closed, the bypass valve is opened, the upper control cavity is communicated with the lower control cavity, the diaphragm seat is driven by the pressure spring to move upwards, so that the pneumatic regulating valve is opened, in the process of opening the pneumatic regulating valve, the air flow in the upper control cavity flows to the lower control cavity, the pressure relief valve relieves the pressure of the lower control cavity, and the air pressure of the upper control cavity and the air pressure of the lower control cavity reach a set value. Therefore, in the operation process of the pneumatic regulating valve, the set air pressure is always kept in the lower control cavity, the pressure value in the lower control cavity and the pressure value of the liquid passing through the valve body are dynamically balanced, the effect of preventing the liquid from flowing into the lower control cavity from the space between the valve rod and the lower valve cover is achieved, the whole valve body is in a fully-closed state, the sealing performance is good, and liquid leakage can be fundamentally avoided.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural view of a pneumatic control valve according to an embodiment of the present invention when closed;

fig. 2 is a schematic structural diagram of the pneumatic control valve according to the embodiment of the present invention when opened.

In the drawings: 10-a valve body; 11-medium inflow channel; 12-a valve stem cavity; 13-a medium outflow channel; 14-a valve seat; 20-lower valve cover; 21-a pilot hole; 22-an annular groove; 23-lower air inlet; 24-lower exhaust ports;

30-upper valve cover; 31-an upper inlet; 32-upper vent; 40-a valve core assembly; 41-a membrane; 411-a diaphragm seat; 412-upper splint; 413-lower splint; 42-a valve stem; 421-a connector; 422-screw cap; 43-valve flap; 431-sealing ring; 432-an annular groove; 433-pressing ring; 44-pressure spring; 51-an upper control chamber; 52-lower control chamber; 53-gas source; 54-a bypass conduit; 55-a bypass valve; 56-pressure relief valve; 61-sealing packing;

62-pressing cover.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the present invention belongs.

As shown in fig. 1 and 2, the present invention provides a pneumatic control valve, which comprises a valve body 10, a lower valve cover 20, an upper valve cover 30 and a valve core assembly 40.

A medium inflow channel 11, a valve rod cavity 12 and a medium outflow channel 13 are arranged in the valve body 10, the valve rod cavity 12 is arranged above the medium inflow channel 11, a valve seat 14 is arranged between the medium inflow channel 11 and the valve rod cavity 12, and the medium outflow channel 13 is communicated with the side part of the valve rod cavity 12.

The lower valve cover 20 is covered on the upper end of the valve rod cavity 12 and is fixedly connected with the valve body 10, the lower valve cover 20 and the valve body 10 can be fixed through bolts, and a guide hole 21 is formed in the center of the lower valve cover 20. The upper valve cover 30 is fixedly covered on the lower valve cover 20, the upper valve cover 30 and the lower valve cover 20 can be fixed through bolts, and a hollow cavity is formed between the upper valve cover 30 and the lower valve cover 20.

The valve core assembly 40 comprises a diaphragm 41, a valve rod 42, a valve clack 43 and a pressure spring 44, wherein the edge of the diaphragm 41 is clamped between the upper valve cover 30 and the lower valve cover 20, the diaphragm 41 vertically divides a hollow cavity between the upper valve cover 30 and the lower valve cover 20 into an upper control cavity 51 and a lower control cavity 52, the middle area of the diaphragm 41 is connected with a diaphragm seat 411, the valve rod 42 penetrates through the guide hole 21, the upper end of the valve rod 42 is connected with the diaphragm seat 411, the valve clack 43 is matched with the valve seat 14, the valve clack 43 is connected with the lower end of the valve rod 42, and the pressure spring 44 is sleeved on the valve rod 42 and supported between.

The upper portion of lower valve cover 20 is equipped with upper air inlet 31 and upper vent 32, and the lower portion of lower valve cover 20 is equipped with lower air inlet 23 and lower vent 24, and upper air inlet 31 links to each other with air supply 53, and air supply 53 here specifically can adopt the air pump, links to each other through bypass pipeline 54 between upper vent 32 and the lower air inlet 23, and bypass pipeline 54 is last to establish ties and is equipped with bypass valve 55, and bypass valve 55 here specifically can be the ball valve, and lower vent 24 is connected with relief valve 56.

As shown in fig. 1, when the pneumatic control valve is closed, the bypass valve 55 is first closed, compressed air is introduced into the upper control chamber 51 through the upper air inlet 31, the compressed air pushes the diaphragm seat 411, the valve rod 42 and the valve flap 43 to move downward until the valve flap 43 abuts against the valve seat 14, the air in the lower control chamber 52 is squeezed in the process that the diaphragm seat 411 moves downward, and because the lower control chamber 52 is connected with the relief valve 56, when the lower control chamber 52 is compressed, redundant air in the lower control chamber 52 is discharged from the relief valve 56, so that the air pressure in the lower control chamber 52 is always kept at a set value.

As shown in fig. 2, when the pneumatic control valve is opened, firstly, the air supply 53 is closed, the bypass valve 55 is opened, the upper control chamber 51 is communicated with the lower control chamber 52, the diaphragm seat 411 is driven by the compression spring 44 to move upwards, so that the pneumatic control valve is opened, in the process of opening the pneumatic control valve, air in the upper control chamber 51 flows towards the lower control chamber 52, and the pressure relief valve 56 relieves the pressure in the lower control chamber 52, so that the air pressures of the upper control chamber 51 and the lower control chamber 52 reach set values.

Therefore, in the operation process of the pneumatic control valve, the set air pressure is always kept in the lower control cavity 52, and the pressure value in the lower control cavity 52 and the pressure value of the liquid passing through the valve body 10 reach dynamic balance, so that the effect of preventing the liquid from flowing into the lower control cavity 52 from the space between the valve rod 42 and the lower valve cover 20 is achieved, the whole valve body 10 is in a fully closed state, the sealing performance is good, and the liquid leakage can be fundamentally avoided.

In this embodiment, the annular groove 22 is formed on the side wall of the guide hole 21, the packing cavity is formed between the annular groove 22 and the valve rod 42, the packing cavity is filled with the sealing packing 61, and by arranging the sealing packing 61, the gap between the valve rod 42 and the lower bonnet 20 can be reduced, and the effect of preventing liquid from flowing into the lower control cavity 52 from the valve body 10 is improved. Preferably, the upper end of the annular groove 22 penetrates through the upper surface of the lower bonnet 20, the upper side of the lower bonnet 20 is fixed with a gland 62 pressed on the upper side of the sealing packing 61 through screws, and the sealing packing 61 is fixed through the gland 62, so that the installation and the disassembly are convenient.

In this embodiment, the diaphragm seat 411 includes an upper clamp plate 412 and a lower clamp plate 413, the upper clamp plate 412 and the lower clamp plate 413 are clamped on two sides of the diaphragm 41, an upper connector 421 is arranged at the upper end of the valve rod 42, the upper connector 421 sequentially penetrates through the lower clamp plate 413, the diaphragm 41 and the upper clamp plate 412, a nut 422 is screwed on the upper end of the upper connector 421, and the upper clamp plate 412, the diaphragm 41 and the lower clamp plate 413 are clamped between the upper end of the valve rod 42 and the nut 422, so that the connection and assembly among the diaphragm seat 411, the diaphragm 41 and the valve rod 42 are conveniently realized.

In the present embodiment, the bottom of the valve flap 43 is provided with a sealing ring 431, and the valve flap 43 can be connected with the valve seat 14 in a sealing manner through the sealing ring 431, so that the sealing performance between the valve flap 43 and the valve seat 14 is improved when the valve is closed. Preferably, the bottom of the valve flap 43 is provided with an annular groove 432, the sealing ring 431 is installed in the annular groove 432, the bottom of the valve flap 43 is further fixed with a pressing ring 433 through screws, and the sealing ring 431 is fixed in the annular groove 432 through the pressing ring 433, so that the sealing ring 431 is convenient to install and detach.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the scope of the embodiments of the present invention, and are intended to be covered by the claims and the specification.

Claims

1. A pneumatic regulator valve, comprising:

the valve comprises a valve body, a valve rod cavity and a medium outflow channel, wherein the valve body is internally provided with the medium inflow channel, the valve rod cavity and the medium outflow channel;

the lower valve cover is arranged at the upper end of the valve rod cavity and fixedly connected with the valve body, and a guide hole is formed in the center of the lower valve cover;

the upper valve cover is fixedly covered on the lower valve cover, and a hollow cavity is formed between the upper valve cover and the lower valve cover;

the valve core assembly comprises a diaphragm, a valve rod, a valve clack and a pressure spring, the edge of the diaphragm is clamped between the upper valve cover and the lower valve cover, a hollow cavity between the upper valve cover and the lower valve cover is vertically divided into an upper control cavity and a lower control cavity by the diaphragm, the middle area of the diaphragm is connected with a diaphragm seat, the valve rod penetrates through the guide hole, the upper end of the valve rod is connected with the diaphragm seat, the valve clack is matched with the valve seat, the valve clack is connected to the lower end of the valve rod, and the pressure spring is sleeved on the valve rod and supported between the lower valve cover and the diaphragm seat;

the upper portion of lower valve gap is equipped with last inlet and last inlet, the lower part of lower valve gap is equipped with air inlet and lower outlet down, go up the inlet and link to each other with the air supply, go up the inlet and link to each other through the bypass line between the air inlet down, it has the bypass valve to establish ties on the bypass line, the air outlet is connected with the relief valve down.

2. The pneumatic regulating valve according to claim 1, wherein an annular groove is formed in a side wall of the guide hole, a packing cavity is formed between the annular groove and the valve rod, and sealing packing is filled in the packing cavity.

3. The pneumatic regulator valve according to claim 2, wherein the upper end of the annular groove penetrates through the upper surface of the lower bonnet, and a gland pressed against the upper side of the packing is fixed to the upper side of the lower bonnet by screws.

4. The pneumatic regulating valve according to claim 1, wherein the diaphragm seat comprises an upper clamping plate and a lower clamping plate, the upper clamping plate and the lower clamping plate are clamped at two sides of the diaphragm, the upper end of the valve rod is provided with an upper connector, the upper connector sequentially penetrates through the lower clamping plate, the diaphragm and the upper clamping plate, a nut is screwed at the upper end of the upper connector, and the upper clamping plate, the diaphragm and the lower clamping plate are clamped between the upper end of the valve rod and the nut.

5. The pneumatic regulating valve according to claim 1, wherein the lower bonnet is fixed to the valve body by bolts.

6. The pneumatic regulating valve according to claim 1, wherein the upper valve cover and the lower valve cover are fixed by bolts.

7. The pneumatic regulator valve according to claim 1, wherein the air source is an air pump.

8. A pneumatic regulator valve as defined in claim 1, wherein the bypass valve is a ball valve.

9. The pneumatic regulating valve according to claim 1, wherein the bottom of the valve flap is provided with a sealing ring, and the valve flap can be connected with the valve seat in a sealing mode through the sealing ring.

10. The pneumatic regulating valve according to claim 9, wherein an annular groove is formed in the bottom of the valve flap, the sealing ring is mounted in the annular groove, a pressing ring is further fixed to the bottom of the valve flap through screws, and the sealing ring is fixed in the annular groove through the pressing ring.