CN217951336U

CN217951336U - Lining pilot safety valve

Info

Publication number: CN217951336U
Application number: CN202222385828.6U
Authority: CN
Inventors: 林建明; 郭新帆; 魏乃岳; 谷成利; 王遵慧; 房旭; 王会勇; 郭新策; 周志有; 张雷雷
Original assignee: LUOFU VALVE GROUP CO LTD
Current assignee: LUOFU VALVE GROUP CO LTD
Priority date: 2022-09-07
Filing date: 2022-09-07
Publication date: 2022-12-02
Anticipated expiration: 2032-09-07

Abstract

The utility model discloses a lining guide formula relief valve aims at solving the main valve corrosion resistance performance of current guide formula relief valve not good, short not enough of life. The utility model comprises a main valve and a pilot valve, wherein the main valve comprises a valve body, a valve cover and a valve clack assembly, a valve cavity is arranged in the valve body, the valve clack assembly is arranged in the valve cavity, and the inner wall of the valve cavity and the surface of the valve cover are both lined with corrosion-resistant lining layers; the valve cover is tightly connected on the valve body, and the lining layer on the valve cover is arranged on the surface opposite to the valve body. The inner wall of the main valve is provided with the corrosion-resistant lining layer, so that the inner wall of the main valve is not easy to corrode, and the service life is prolonged.

Description

Lining pilot operated safety valve

Technical Field

The present invention relates to valve technology, and more particularly, to a liner-guided safety valve.

Background

The pilot safety valve is a high-end safety valve product, and comprises a main valve and a pilot valve, when the pressure of a protected system rises to a set pressure, the pilot valve is opened, the pressure above a valve clack of the main valve is reduced, the main valve is opened, and the system is decompressed. When the pressure of the protected system is reduced to a certain value, the pilot valve returns to the seat, the pressure above the valve clack of the main valve is increased, and the main valve is closed. The pilot operated safety valve has excellent performance, so that the pilot operated safety valve is widely used, but for part of working conditions of strong corrosive media, the inner wall of the main valve of the commonly used pilot operated safety valve is easy to corrode, and the service life is short.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model provides a lining guide safety valve sets up corrosion-resistant lining layer on the main valve inner wall, makes the main valve inner wall be difficult for being corroded, is favorable to increase of service life.

In order to solve the technical problem, the utility model discloses a following technical scheme: a lining pilot operated safety valve comprises a main valve and a pilot valve, wherein the main valve comprises a valve body, a valve cover and a valve clack assembly; the valve cover is tightly connected with the valve body, and the lining layer on the valve cover is arranged on the surface opposite to the valve body.

When the lining pilot operated safety valve is used for corroding media, the corrosion resistance of the lining layer is good, the inner wall of the main valve is well protected, and the service life of the main valve is prolonged. And the surface of the valve cover opposite to the main valve is also provided with a lining layer, so that the medium flowing into the main valve from the pilot valve is prevented from corroding the surface of the valve cover.

Preferably, the inner wall of the valve cavity and the surface of the valve cover are respectively provided with a dovetail groove, and the dovetail grooves are filled with the lining layer.

The dovetail groove is arranged, so that the connection between the lining layer and the inner wall of the valve cavity or the surface of the valve cover is more reliable, and the phenomenon that the lining layer falls off is prevented.

Preferably, the valve body is provided with a medium inlet, a medium outlet and a mounting opening, the lining layer in the valve cavity is provided with flanges at the positions of the medium inlet, the medium outlet and the mounting opening, the edges of the medium inlet, the medium outlet and the mounting opening on the valve body are provided with reinforcing grooves, and the reinforcing grooves are filled with the flanges.

The reinforcing groove is filled with the flanging which is connected with the lining layer into a whole, so that the connection reliability of the lining layer is improved.

Preferably, a circumferentially arranged connecting groove is formed in a position, corresponding to the edge of the lining layer, on the valve cover, and the connecting groove is filled with the lining layer on the valve cover.

The connecting groove is connected with the edge of the lining layer, so that the separation phenomenon between the edge of the lining layer and the surface of the valve cover is prevented.

Preferably, the valve body is close to the medium inlet, the medium outlet position is provided with the discharge hole respectively, the influent hole, the position that corresponds with the installing port on the valve cover is equipped with the through-flow hole, the discharge hole, the influent hole, the through-flow hole all includes big footpath section, the path section, big footpath section and path section link together and be T shape structure, form corrosion resistant cover on the lining layer extends to path section inner wall, corrosion resistant cover one end links into an organic whole structure with the lining layer, the corrosion resistant cover other end is equipped with the bulge loop, the bulge loop links together with the transition surface between big footpath section and the path section.

The large-diameter section of the outflow hole, the inflow hole and the through flow hole is connected with the joint, and the end part of the joint is abutted against the convex ring, so that a medium cannot be in contact with the surface of the valve body, and the corrosion phenomenon caused by contact is avoided. And the arrangement of the corrosion-resistant sleeve and the convex ring can improve the reliability of the connection of the lining layer and the inner wall of the valve body or the end face of the valve cover.

Preferably, the pilot valve is provided with a pressure inlet, a pressure outlet and a pressure discharge port, a pressure inlet pipe is connected between the pressure inlet and the flow outlet, a pressure connecting pipe is connected between the pressure outlet and the flow hole, and a pressure discharge pipe is connected between the pressure discharge port and the flow inlet.

The arrangement of the pressure inlet pipe, the pressure connecting pipe and the pressure discharging pipe is convenient for the medium flowing between the main valve and the pilot valve.

Preferably, the valve clack assembly comprises a guide sleeve and a piston, the piston is sleeved in the guide sleeve in a matched mode, one end of the guide sleeve is tightly installed between the valve cover and the valve body, a spring is installed between the piston and the valve cover, sealing rings are correspondingly arranged in the valve cavity and the piston, the lining layer covers the surface of each sealing ring, a convex corrosion-resistant sealing ring is arranged on the surface of the lining layer in a position corresponding to the sealing ring, a sealing convex ring is correspondingly arranged on the end face of the piston and the corrosion-resistant sealing ring, and the end face of the sealing convex ring is in sealing fit with the end face of the corrosion-resistant sealing ring.

When the medium pressure of the system is greater than the setting pressure, the piston is pushed, the spring is compressed, and the main valve is opened. When the medium pressure of the system is smaller than the setting pressure, the end face of the sealing convex ring on the piston is in sealing fit with the end face of the corrosion-resistant sealing ring on the lining layer, and the hardness difference exists between the sealing convex ring and the corrosion-resistant sealing ring, so that the sealing performance can be improved.

Preferably, the piston is connected with a height-limiting sleeve, and a height-limiting gap is arranged between the height-limiting sleeve and the valve cover.

The setting of limit for height cover limits the opening height of piston, prevents that the piston from excessively opening and damaging the spring.

Preferably, the spring surface is lined with a corrosion resistant layer. The corrosion-resistant layer plays a role in protecting the spring.

Compared with the prior art, the beneficial effects of the utility model are that: (1) The inner wall of the main valve is provided with the corrosion-resistant lining layer, so that the inner wall of the main valve is not easy to corrode, and the service life is prolonged; (2) The lining layer is reliably connected with the inner wall of the valve body and the surface of the valve cover, and the lining layer is not easy to fall off.

Drawings

FIG. 1 is a schematic view of the present invention;

in the figure: 1. the valve comprises a main valve, 2, a pilot valve, 3, a valve body, 4, a valve cover, 5, a valve cavity, 6, a lining layer, 7, a dovetail groove, 8, a medium inlet, 9, a medium outlet, 10, a mounting port, 11, a flanging, 12, a reinforcing groove, 13, an expanding groove, 14, a connecting groove, 15, an outflow hole, 16, an inflow hole, 17, a through flow hole, 18, a corrosion-resistant sleeve, 19, a convex ring, 20, an inflow pipe, 21, a through pressure pipe, 22, a pressure discharge pipe, 23, a joint, 24, a guide sleeve, 25, a piston, 26, a spring, 27, a sealing ring, 28, a corrosion-resistant sealing ring, 29, a sealing convex ring, 30, a height limiting sleeve, 31 and a flange.

Detailed Description

The technical solution of the present invention is further described in detail by the following specific embodiments in combination with the accompanying drawings:

the embodiment is as follows: a lining pilot operated safety valve (refer to figure 1), including the main valve 1, pilot valve 2, the main valve includes the valve block 3, valve bonnet 4, valve flap assembly, there are valve chambers 5 in the valve block, the valve flap assembly is installed in valve chamber, the valve chamber inner wall and valve bonnet surface are lined with the corrosion-resistant lining layer 6; the valve cover is tightly connected on the valve body, and the lining layer on the valve cover is arranged on the surface opposite to the valve body.

Dovetail grooves 7 are formed in the inner wall of the valve cavity and the surface of the valve cover, and the dovetail grooves are filled in the lining layer. The valve body is provided with a medium inlet 8, a medium outlet 9 and a mounting port 10, the lining layer in the valve cavity is provided with flanges 11 at the positions of the medium inlet, the medium outlet and the mounting port, the edges of the medium inlet, the medium outlet and the mounting port on the valve body are provided with reinforcing grooves 12, and the reinforcing grooves are filled with the flanges. The opening widths of the reinforcing grooves at the positions of the medium inlet and the medium outlet are smaller than the width of the bottom surface, and the cross sections of the reinforcing grooves are in a trapezoidal structure; the installation opening is provided with an expanding groove 13, and the reinforcing groove is arranged at the outer edge of the bottom surface of the expanding groove. The connecting groove 14 that circumference set up is equipped with to the corresponding position of lining layer edge on the valve gap, and the lining layer on the valve gap is filled up the connecting groove.

Be close to the medium import on the valve body, the medium exit position is provided with discharge orifice 15 respectively, inflow orifice 16, the position is equipped with through-flow orifice 17 with the installing port correspondence on the valve bonnet, the discharge orifice, the inflow orifice, through-flow orifice all includes big footpath section, the path section, big footpath section and path section link together and are T shape structure, the backing layer extends to and forms corrosion resistant cover 18 on the path section inner wall, corrosion resistant cover one end links into an integrated entity structure with the backing layer, the corrosion resistant cover other end is equipped with bulge loop 19, the bulge loop links together with the changeover surface between big footpath section and the path section. The inner wall of the large-diameter section is provided with internal threads. The pilot valve is provided with a pressure inlet, a pressure outlet and a pressure discharge port, wherein a pressure inlet pipe 20 is connected between the pressure inlet and the flow outlet, a pressure through pipe 21 is connected between the pressure outlet and the flow hole, and a pressure discharge pipe 22 is connected between the pressure discharge port and the flow inlet. The ends of the pressure inlet pipe, the pressure through pipe and the pressure discharge pipe are connected with connectors 23, and the connectors are in threaded connection with the large-diameter section.

The valve clack assembly comprises a guide sleeve 24 and a piston 25, the piston is sleeved in the guide sleeve in an adaptive mode, one end of the guide sleeve is tightly installed between a valve cover and a valve body, a spring 26 is installed between the piston and the valve cover, a sealing ring 27 is correspondingly arranged in a valve cavity and the piston, a lining layer covers the surface of the sealing ring, a convex corrosion-resistant sealing ring 28 is arranged at the position, corresponding to the sealing ring, on the surface of the lining layer, a sealing convex ring 29 is correspondingly arranged on the end face of the piston and corresponds to the corrosion-resistant sealing ring, and the end face of the sealing convex ring is in sealing fit with the end face of the corrosion-resistant sealing ring. The piston is connected with a height-limiting sleeve 30, and a height-limiting clearance is arranged between the height-limiting sleeve and the valve cover. The spring surface is lined with a corrosion resistant layer. The lower part of the spring is arranged in the height-limiting sleeve, the end part of the guide sleeve is provided with a flange 31, the flange is arranged in an expanding groove at the position of the mounting opening, and the flange is abutted between the bottom surface of the expanding groove and the valve cover.

The valve body and the valve cover are made of carbon steel castings, and the lining layer is made of F46 material or PFA material. The guide sleeve, the piston, the guide valve and the joint are made of special materials, and the special materials comprise one of Hardgrove alloy B, hardgrove alloy C and Monel alloy.

When the lining pilot operated safety valve is used for corroding media, the corrosion resistance of the lining layer is good, the inner wall of the main valve is well protected, and the service life of the main valve is prolonged. And a lining layer is arranged on the surface of the valve cover opposite to the main valve, so that the medium flowing into the main valve from the pilot valve is prevented from corroding the surface of the valve cover.

The above-described embodiments are intended to be illustrative, and not restrictive, and other modifications and variations may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A lining pilot operated safety valve comprises a main valve and a pilot valve, and is characterized in that the main valve comprises a valve body, a valve cover and a valve flap assembly, a valve cavity is arranged in the valve body, the valve flap assembly is arranged in the valve cavity, and the inner wall of the valve cavity and the surface of the valve cover are both lined with corrosion-resistant lining layers; the valve cover is tightly connected with the valve body, and the lining layer on the valve cover is arranged on the surface opposite to the valve body.

2. The liner-piloted safety valve of claim 1, wherein dovetail slots are formed in the inner wall of the valve cavity and the surface of the valve cap, and the liner layer fills the dovetail slots.

3. The liner pilot operated relief valve according to claim 1, wherein the valve body is provided with a medium inlet, a medium outlet and a mounting port, the liner layer in the valve cavity is provided with flanges at the positions of the medium inlet, the medium outlet and the mounting port, the edges of the medium inlet, the medium outlet and the mounting port on the valve body are provided with reinforcing grooves, and the flanges fill the reinforcing grooves.

4. The liner-guided safety valve of claim 1, wherein the valve bonnet has circumferentially disposed attachment slots formed in the valve bonnet at locations corresponding to the edges of the liner layer, the liner layer on the valve bonnet filling the attachment slots.

5. The liner-guided safety valve as claimed in claim 3, wherein the valve body is provided with an outlet hole and an inlet hole at positions close to the medium inlet and the medium outlet, respectively, the valve cover is provided with an outlet hole at a position corresponding to the mounting hole, the outlet hole, the inlet hole and the outlet hole each comprise a large diameter section and a small diameter section, the large diameter section and the small diameter section are connected together to form a T-shaped structure, the liner layer extends to the inner wall of the small diameter section to form a corrosion-resistant sleeve, one end of the corrosion-resistant sleeve is connected with the liner layer to form an integral structure, the other end of the corrosion-resistant sleeve is provided with a convex ring, and the convex ring is connected with a transition surface between the large diameter section and the small diameter section.

6. The liner-guided safety valve of claim 5, wherein the pilot valve has a pressure inlet, a pressure outlet, and a pressure outlet, wherein the pressure inlet is connected to the flow outlet via a pressure pipe, the pressure outlet is connected to the flow port via a pressure pipe, and the flow inlet is connected to the flow port via a pressure pipe.

7. The liner-guided safety valve as claimed in any one of claims 1 to 6, wherein the valve flap assembly comprises a guide sleeve, a piston, the piston is fitted in the guide sleeve, one end of the guide sleeve is tightly fitted between the valve cover and the valve body, a spring is fitted between the piston and the valve cover, a sealing ring is provided in the valve cavity corresponding to the piston, the lining layer covers the surface of the sealing ring, a convex corrosion-resistant sealing ring is provided on the surface of the lining layer at a position corresponding to the sealing ring, a sealing convex ring is provided on the end surface of the piston corresponding to the corrosion-resistant sealing ring, and the end surface of the sealing convex ring is in sealing fit with the end surface of the corrosion-resistant sealing ring.

8. The pilot operated safety valve in liner according to claim 7, wherein the piston is connected to a height-limiting sleeve, and a height-limiting gap is provided between the height-limiting sleeve and the valve cap.

9. The liner-piloted safety valve of claim 7 wherein the spring surface is lined with a corrosion resistant layer.