CN2225583Y

CN2225583Y - Spring isolation safety valve

Info

Publication number: CN2225583Y
Application number: CN 95243061
Authority: CN
Inventors: 余汉成
Original assignee: EXPLORATION AND DESIGN INST SICHUAN PETROLEUM ADMINISTRATION
Current assignee: EXPLORATION AND DESIGN INST SICHUAN PETROLEUM ADMINISTRATION
Priority date: 1995-04-17
Filing date: 1995-04-17
Publication date: 1996-04-24
Anticipated expiration: 2005-04-17

Abstract

The utility model relates to a spring isolation safety valve, belonging to the technical field of a spring type safety valve. The spring isolation safety valve is composed of a valve body, a holder type check valve, a spring, a valve clack valve rod, and a sealing member. A fully enclosed spring type safety valve is usually adopted in the prior art. A sealing isolation device is additionally arranged between the spring and a cavity chamber by the spring isolation safety valve. The spring isolation safety valve is composed of two low resistance sealing rings, an oil storage cavity, and an oil filling nozzle. The spring and a discharge medium inside the oil storage cavity can be isolated. The spring can not be contacted with the medium at any time, and the corrosion function of the medium to the spring is avoided. A reverse locking screw bolt is arranged on the holder type check valve. When the spring isolation safety valve is maintained, the holder type check valve can still normally work. The spring isolation safety valve is especially suitable for the technology that the medium needs to be prevented from generating brittle fracture to the spring. The utility model has the advantages of convenient processing, easy material selection, and easy production.

Description

A kind of spring isolation safe valve

The utility model relates to a kind of technical field of Direct spring loaded safety valve.

In the prior art, the safety valve that is used for aggressive medium, usually the Direct spring loaded safety valve that adopts is a totally enclosed type, for making safety valve outer the rushing down of discharge medium in when work, environment is not polluted, but this class safety valve can't solve the corrosion of medium to spring, and diaphragm type safety valve or corrugated safety valve have adopted barrier film or bellows that aggressive medium is implemented isolation in valve pocket, the shortcoming of its door is: the diaphragm type safety valve is provided with barrier film between spring and chamber, solved the etching problem of aggressive medium to spring, but because the area of the tension force of barrier film itself and barrier film is bigger, being discharged back pressure influences factors such as big, and barrier film has bigger influence to the safety valve service behaviour; Though and the bellows safety valve can head it off, the manufacturing of bellows, processing and selection are difficult.

The purpose of this utility model is to design a kind of safety valve that has the seal isolation structure that can make spring and chamber isolation.

The utility model is achieved in that the utility model comprises spring isolation safe valve body, Wafer Check Valves, spring, flap valve rod and seal ring, sliding position on flap valve rod top is provided with the lubrication and seal circle, this lubrication and seal circle is made up of the seal ring of twice low-frictional force, a lubrication and seal fat shoe cream room is arranged between the two seals circle, safety valve is when work, aggressive medium in the valve pocket is under the sealing of lubricating and sealing device, can not pass the slip surface of valve rod and rush down drain to spring lead the letter in spring is caused corrosion, can not enter atmosphere pollutes environment, on Wafer Check Valves, be provided with and lock bolt, so that be used for the multichannel blowdown system at this valve, do not influence the proper functioning of safety check when overhauling, blowdown system does not influence the maintenance to safety valve yet when back pressure is arranged, and the internal diameter of outlet(discharge) flange is enlarged, to increase the circulation area of safety check.

The utility model has the advantages that: injection seal grease and two road friction coefficients are low owing to having adopted, the Sealing that slide area is little, safety valve is in the aggressive medium in when work befouling environment that can not leak, can not corrode spring, owing to be provided with and lock bolt, easier during maintenance, can be used for the various occasions that aggressive medium is arranged.

Accompanying drawing is a structural drawing of the present utility model.

Provide embodiment of the present utility model below in conjunction with accompanying drawing:

Sliding position on the top of flap valve rod of the present utility model (6) is provided with two road friction coefficients low lubrication and seal circle (1) and (5), between lubrication and seal circle (1) and (5), be provided with shoe cream room (2), shoe cream room (2) is connected with outside pump nozzle (4) by oil hole (3), by pump nozzle (4) to shoe cream room (2) filling lubrication and seal grease, to reduce the friction factor between flap valve rod (6) and seal ring (1) and (5), when aggressive medium when the safety valve nozzle entrance enters the valve pocket of this spring isolation safe valve, because under the sealing of the lubrication and seal grease of top in seal ring (1) and (5) and shoe cream room (2) of flap valve rod (6), can not upwards enter the spring guide corrosion spring and the befouling environment that leaks, for preventing that the spring in the spring guide is corroded, on the outer cover of spring guide, open transom window (7); In order when back pressure is arranged, not influence service work to safety valve yet, on Wafer Check Valves (10), be provided with and lock bolt (8), by locking bolt (8) Wafer Check Valves (10) and outlet(discharge) flange (9) are fixed together, during maintenance, only pulling down double end fixing screw (11) can overhaul safety valve, because locking bolt (8) is fixed together Wafer Check Valves (10) and outlet(discharge) flange (9), Wafer Check Valves (10) is still in running order, therefore, even when the multichannel blowdown system has back pressure, do not influence maintenance to safety valve yet.

Claims

1. a spring isolation safe valve is made up of valve body, Wafer Check Valves, spring, flap valve rod and Sealing, it is characterized in that:

A. the top sliding position at described flap valve rod (6) is provided with lubrication and seal circle (1) and (5);

B. between lubrication and seal circle (1) and (5), be provided with shoe cream room (2);

C. be provided with on described Wafer Check Valves (10) and lock bolt (8), Wafer Check Valves (10) is fixed together by locking bolt (8) with outlet(discharge) flange (9).

2. a kind of spring isolation safe valve according to claim 1 is characterized in that: described shoe cream room (2) is connected with pump nozzle (4) by oil hole (3).