CN102620018A

CN102620018A - High-temperature high-pressure pneumatic control automatic pressure relief valve

Info

Publication number: CN102620018A
Application number: CN2012100959461A
Authority: CN
Inventors: 徐文娴
Original assignee: TIANZHENG VALVE CO Ltd
Current assignee: TIANZHENG VALVE CO Ltd
Priority date: 2012-03-29
Filing date: 2012-03-29
Publication date: 2012-08-01
Anticipated expiration: 2032-03-29
Also published as: CN102620018B

Abstract

The invention relates to a high-temperature high-pressure pneumatic control automatic pressure relief valve, which comprises a main valve and a pilot valve. The main valve comprises a valve body, a valve clack, a valve rod and a valve cover. The high-temperature high-pressure pneumatic control automatic pressure relief valve is characterized in that: a piston cavity is formed on the upper part of the valve body; the upper end of the valve rod penetrates through the valve body, and is fixedly connected with a piston in the piston cavity; the flat area of the upper end face of the piston is larger than that of the lower end face of the valve clack; the pilot valve adopts a pneumatic control valve which comprises a pilot valve body, a pilot valve clack and a pneumatic device; an inlet of the pilot valve body is communicated with an inlet of the valve body, and an outlet of the pilot valve body is communicated with the piston cavity on one side of the upper plane of the piston; the pilot valve clack is connected with a transmission shaft of the pneumatic device; an air source control circuit of the pneumatic device is connected in series with a pressure control switch of a pressure sensor which is arranged in an intake vent of the valve body; and a discharge orifice is formed in the pilot valve body. The opening/closing state of the pilot valve is controlled according to a pressure signal of the pressure sensor by the pneumatic device. The high-temperature high-pressure pneumatic control automatic pressure relief valve has the advantages of accurate and stable set pressure, discharge pressure equal to the set pressure, and the like, and is applied to a pressure relief protection device of a high-temperature high-pressure vessel.

Description

HTHP gas control automatic decompression valve

Technical field

The present invention relates to valve field, specifically about a kind of Decompression valves.The present invention is applicable to the decompression protection device of high temperature such as steam, nitrogen, high-pressure bottle.

Background technique

The Decompression valves that is used for pipeline, container at present generally adopts the Pilot operated safety valve structure, utilizes pilot valve control main valve.Pilot valve is a Direct spring loaded safety valve, has independently pressure release function, and when system pressure reached Set pressure, pilot valve was opened, and the medium in the main valve piston chamber of releasing, main spool spring promote flap and open.Like publication number is the built-in Pilot operated safety valve of CN102313052A, comprises main valve and pilot valve, and main valve comprises valve body, valve gap, main valve seat, main valve clack, main valve guide sleeve, main spool spring, main valve stop collar, and pilot valve is installed in the endoporus of main valve stop collar.When pressure medium surpassed setup pressure value, medium promoted pilot valve flap compression pilot valve spring and opens pilot valve, and the pressure in the main valve clack back side spring chamber of releasing makes main valve open relieving pressure, protective system safety.Its major defect is that spring is under different temperature condition; Has the different elasticity coefficient; So there is bigger fluctuation in Set pressure under the condition of high temperature; Low, the poor stability of the degree of accuracy of its Set pressure, discharge pressure and Set pressure differ bigger, are not suitable for high container of Set pressure required precision or pipe-line system and use.

Summary of the invention

The objective of the invention is the shortcoming to the existing technology existence, provide a kind of Set pressure accurate, stable, discharge pressure and Set pressure differ little HTHP gas control automatic decompression valve.

Technological scheme of the present invention comprises main valve and pilot valve, and main valve comprises valve body, flap, valve rod, valve gap, and valve body is shaped on import and outlet, and the valve rod lower end is fixedly connected with flap, and plane and valve body inlet passage side have the sealing surface that cooperatively interacts on the flap.Mainly be that valve body top is shaped on piston cavity, the valve rod upper end is passed valve body and is fixedly connected with the interior piston of piston cavity, and the area of plane of piston upper-end surface is greater than the area of plane of flap lower end surface; Pilot valve adopts Pneumatic valve; This Pneumatic valve comprises pilot valve body, pilot valve lobe and Pneumatic actuator, and the import of pilot valve body is communicated with the valve body import, and the piston cavity of plane one side is communicated with on the outlet of pilot valve body and the piston; The pilot valve lobe is connected with the transmission shaft of Pneumatic actuator; Be connected in series on the source of the gas control circuit of the Pneumatic actuator pressure control switch of pressure transducer, this pressure transducer is installed in the valve body inlet passage, is shaped on discharge orifice on the pilot valve body.

In above technological scheme; The pilot valve lobe is fitted on the sealing surface of pilot valve body suction side by pilot valve lid through a spring; This pilot valve lid is shaped on the passage that is communicated with pilot valve body import and valve body import; Have the sealing surface that cooperatively interacts between pilot valve lobe and the pilot valve body, the center fixation of pilot valve flap seal face one side have with the pilot valve body in the pilot hole guide rod that cooperatively interacts, the central lines of the center line of this guide rod and Pneumatic actuator transmission shaft; Transmission shaft is made up of one section minor diameter push rod and one section major diameter push rod; The end face of minor diameter push rod and the end face of guide rod contact each other, are shaped on the matching hole that cooperates with the motive sealing of major diameter push rod on the pilot valve body, and this matching hole is communicated with discharge orifice; The position of said discharge orifice is positioned at the minor diameter push rod position of transmission shaft when pilot valve cuts out, and pilot valve is positioned at the major diameter push rod position of transmission shaft when opening.

In above technological scheme; The valve rod upper end connects a stabilizer, and said stabilizer is made up of pull bar, stretched spring and spring seat, and the pull bar lower end is fixedly connected with the valve rod upper end; The pull bar upper end is passed valve gap and is connected spring seat, and stretched spring is installed between spring seat lower end surface and the valve gap upper-end surface.

Advantage of the present invention is that the keying state of pilot valve is controlled through Pneumatic actuator by the pressure transducer that is installed in the main valve inlet passage, makes the Set pressure of main valve accurate, stablizes, and the difference between actual discharge pressure and the theoretical Set pressure is little.

Description of drawings

Fig. 1 is a structure sectional view of the present invention.

Embodiment

HTHP gas control automatic decompression valve as shown in Figure 1; Comprise main valve and pilot valve, main valve comprises valve body 1, flap 2, valve rod 3, valve gap 8, and valve body 1 is shaped on import and outlet; Valve rod 3 lower ends are fixedly connected with flap 2; Plane and valve body 1 inlet passage side have the sealing surface that cooperatively interacts on the flap 2, and promptly flap 2 is positioned at valve body 1 inlet passage, the sealing that cooperatively interacts of the sealing surface of seat between flap 2 sealing surfaces and valve body 1 inlet passage and the outlet passage.Valve body 1 top is shaped on piston cavity 5; Valve rod 3 upper ends are passed valve body 1 and are fixedly connected with piston cavity 5 interior pistons 7, in piston cavity 5, are provided with piston cylinder 6, and this piston cylinder 6 is installed in the piston cavity 5 by valve gap 8 sealings; Piston 7 motive sealing in piston cylinder 6 cooperates; Be provided with axle sleeve 4 between valve rod 3 middle parts and the valve body 1, between this axle sleeve 4 and the valve body 1 static seal cooperate, with valve rod 3 between motive sealing cooperate, in the piston cavity 5 of piston 7 lower end surfaces, be shaped on the through hole that is communicated with atmosphere.The area of plane of piston 7 upper-end surfaces is greater than the area of plane of flap 2 lower end surfaces, and after pilot valve was opened, medium produced downward thrust greater than flap 2 lower planes are produced thrust upwards to plane on the piston 7, and main valve is opened; Pilot valve adopts Pneumatic valve; This Pneumatic valve comprises pilot valve body 17, pilot valve lobe and Pneumatic actuator 18, and the import of pilot valve body 17 is communicated with valve body 1 import, and the outlet of pilot valve body 17 is communicated with through the piston cavity 5 of plane one side on connecting tube 15 and the piston 7; The pilot valve lobe is connected with the transmission shaft of Pneumatic actuator 18; Be connected in series on the source of the gas control circuit of Pneumatic actuator 18 pressure control switch of pressure transducer, this pressure transducer is installed in valve body 1 inlet passage, is shaped on discharge orifice 20 on the pilot valve body 17.When pressure medium in valve body 1 inlet passage surpasses Set pressure; Pressure sensor signal is connected Pneumatic actuator 18 work sources of the gas; Pneumatic actuator 18 promotes the pilot valve lobes plane on valve body of main valve 1 inlet passage and the piston 7 is communicated with, and medium promotion piston 7 is with the flap 2 unlatchings medium of releasing; When pressure medium in valve body 1 inlet passage is released to when being lower than Set pressure; Pressure sensor signal breaks off Pneumatic actuator 18 work sources of the gas; The pilot valve lobe cuts off the passage between the plane on valve body of main valve 1 inlet passage and the piston 7; Simultaneously plane on the piston 7 is communicated with discharge orifice 20, the medium on the bleed piston 7 in the planar piston chamber 5 is closed flap 2 under the medium thrust.The Set pressure of main valve is through pressure transducer control pilot valve, and its Set pressure precision is high, good stability, and discharge pressure equates with Set pressure.

Pilot valve lobe 23 is fitted on the sealing surface of pilot valve body 17 imports by pilot valve lid 25 through a spring 24, i.e. top shock mount 24 between the back side of pilot valve lobe 23 sealing surfaces and the pilot valve lid 25.Pilot valve lid 25 is shaped on the passage that is communicated with pilot valve body 17 imports and valve body 1 import; Has the sealing surface that cooperatively interacts between pilot valve lobe 23 and the pilot valve body 17; When pressure medium is lower than Set pressure in valve body 1 inlet passage; Pressure sensor signal breaks off Pneumatic actuator 18 work sources of the gas; Spring 24 compresses pilot valve lobe 23 and is sealed and matched with pilot valve body 17, the center fixation of pilot valve lobe 23 sealing surfaces one side have with pilot valve body 17 in the pilot hole guide rod 22 that cooperatively interacts, said pilot hole is located at the center of pilot valve body 17 imports; 17 imports of pilot valve body are made up of the pod apertures 16 that several are evenly distributed on the pilot hole periphery, the central lines of the center line of guide rod 22 and Pneumatic actuator 18 transmission shafts.Transmission shaft is made up of one section minor diameter push rod 21 and one section major diameter push rod 19, and the end face of the end face of minor diameter push rod 21 and guide rod 22 contacts each other, promptly transmission shaft and guide rod 22 contact an end diameter less than its end that is connected with Pneumatic actuator 18.Be shaped on the matching hole that cooperates with 19 motive sealings of major diameter push rod on the pilot valve body 17; This matching hole is communicated with discharge orifice 20; The position of discharge orifice 20 is positioned at minor diameter push rod 21 positions of transmission shaft when pilot valve cuts out, and pilot valve is positioned at major diameter push rod 19 positions of transmission shaft when opening, and makes pilot valve close on the back piston 7 medium back flow in the planar piston chamber 5 and discharges from this discharge orifice 20 through pilot valve body 17 outlet backs; Main valve is closed; And pilot valve is opened rear propeller shaft with discharge orifice 20 shutoff, and main valve inlet passage medium is through 17 imports of pilot valve body, 17 outlets of pilot valve body, and plane promotion piston 7 is opened main valve on the entering main valve piston 7.

Valve rod 3 upper ends connect a stabilizer; Said stabilizer is made up of pull bar 12, stretched spring 13 and spring seat 14; Pull bar 12 lower ends are fixedly connected with valve rod 3 upper ends, and pull bar 12 upper ends are passed valve gap 8 and connected spring seat 14, and stretched spring 13 is installed between spring seat 14 lower end surfaces and valve gap 8 upper-end surfaces; Tension flap 2 and sealing surface of seat fitted seal prevent flap 2 vibrations.

Constituting motive sealing by stuffing box packing 9, Gland 11 and gland nut 10 between pull bar 12 and the valve gap 8 cooperates.

Claims

1. HTHP gas control automatic decompression valve; Comprise main valve and pilot valve; Main valve comprises valve body (1), flap (2), valve rod (3), valve gap (8), and valve body (1) is shaped on import and outlet, and valve rod (3) lower end is fixedly connected with flap (2); It is characterized in that flap (2) is gone up the plane and valve body (1) inlet passage side has the sealing surface that cooperatively interacts; Valve body (1) top is shaped on piston cavity (5), and valve rod (3) upper end is passed valve body (1) and is fixedly connected with the interior piston (7) of piston cavity (5), and the area of plane of piston (7) upper-end surface is greater than the area of plane of flap (2) lower end surface; Pilot valve adopts Pneumatic valve; This Pneumatic valve comprises pilot valve body (17), pilot valve lobe and Pneumatic actuator (18); The import of pilot valve body (17) is communicated with valve body (1) import; The piston cavity (5) that the outlet of pilot valve body (17) is gone up the plane through connecting tube (15) and piston (7) is communicated with, and the pilot valve lobe is connected with the transmission shaft of Pneumatic actuator (18), the pressure control switch of the pressure transducer that is connected in series on the source of the gas control circuit of Pneumatic actuator (18); This pressure transducer is installed in valve body (1) inlet passage, is shaped on discharge orifice (20) on the pilot valve body (17).

2. HTHP gas control automatic decompression valve according to claim 1; It is characterized in that pilot valve lobe (23) is fitted on the sealing surface of pilot valve body (17) import by pilot valve lid (25) through a spring (24); Pilot valve lid (25) is shaped on the passage that is communicated with pilot valve body (17) import and valve body (1) import; Has the sealing surface that cooperatively interacts between pilot valve lobe (23) and the pilot valve body (17); The center fixation of pilot valve lobe (23) sealing surface one side have with pilot valve body (17) in the guide rod (22) that cooperatively interacts of pilot hole; The central lines of the center line of guide rod (22) and Pneumatic actuator (18) transmission shaft, transmission shaft is made up of one section minor diameter push rod (21) and one section major diameter push rod (19), and the end face of the end face of minor diameter push rod (21) and guide rod (22) contacts each other; Be shaped on the matching hole that cooperates with major diameter push rod (19) motive sealing on the pilot valve body (17); This matching hole is communicated with discharge orifice (20), and the position of discharge orifice (20) is positioned at minor diameter push rod (21) position of transmission shaft when pilot valve cuts out, and pilot valve is positioned at major diameter push rod (19) position of transmission shaft when opening.

3. HTHP gas control automatic decompression valve according to claim 1 and 2; It is characterized in that valve rod (3) upper end connects a stabilizer; Said stabilizer is made up of pull bar (12), stretched spring (13) and spring seat (14); Pull bar (12) lower end is fixedly connected with valve rod (3) upper end, and pull bar (12) upper end is passed valve gap (8) and connected spring seat (14), and stretched spring (13) is installed between spring seat (14) lower end surface and valve gap (8) upper-end surface.