CN85204171U - Self-pressing combined unit of principal-auxilliary valve clack of stop valve - Google Patents

Abstract

The utility model discloses an assembly of a main and auxiliary valve flaps of a self-pressuring stop valve, in particular to being used for a stop valve with high-temperature, high-pressure and large caliber. The utility model is suitable for being used in pipe lines with media of hydrogen gas, air, steam and liquids with high-temperature, normal temperature, high pressure and medium pressure, comprising a main valve flap [1], an auxiliary valve flap [2], a pressure bearing sleeve [3], a supporting sleeve [4], a folio whorl [11], a butterfly spring [6] and a valve flap cover [8]. Compared with general stop valves, the utility model has the advantages of good tightness, high safety, light weight, long service life, small volume and material saving, and the caliber manufacturing stop valves with high-pressure and high-temperature can reach 1000 mm.

Description

Self-pressing combined unit of principal-auxilliary valve clack of stop valve

The utility model is applicable to high temperature, normal temperature, height, middle pressure, large and medium-sized latus rectum stop valve.This valve is useful in and makes path and closed circuit device usefulness in high temperature, normal temperature, high pressure, middle pressure hydrogen, air, steam, the liquid and other medium pipeline.

Present stop valve has only a flap and valve body sealing surface to form sealing configuration.Medium is to flow into from the flap below, and the open and close of valve rely on very big valve rod power, and the valve rod masterpiece is used in and makes sealing pay forced seal on the flap.Therefore, valve rod has born very large medium active force and valve seal power, has limited high pressure, the development of latus rectum stop valve greatly.

By retrieval, the application of domestic 82 years of the Soviet Union, 84 years patent granteds number are that the major and minor flap action principle of 3505854/25-08 cut-off valve and the utility model are basic identical, but the structure difference.

The secondary flap of Soviet Union's formula cut-off valve is by guiding core location, and the guiding core cooperates with relief hole, and relieving characteristics is relatively poor, and the relief hole size is big.

Soviet Union's formula cut-off valve does not have the supporting sleeve structure, and valve rod power all acts on the secondary flap.

The belleville spring of Soviet Union's formula cut-off valve is contained in the outside of valve rod head, and when the valve open and close, spring force exists all the time, and secondary valve pressure release is not thorough.

The purpose of this utility model is to reduce valve rod power, so that the high temperature of development China industrial urgent need, normal temperature, height, middle pressure, big latus rectum stop valve improve the valve seal performance, prolongs valve working life.

The utility model is achieved in that the medium of general stop valve flows into from the flap below, and valve seal relies on the forced seal of valve rod power.This structural change MEDIA FLOW flows into from the flap top to, medium, and it is self-pressure-sealed that valve seal is become, and for middle and high piezodielectric, its sealing does not need valve rod active force, good seal performance.

But during Open valve, the medium power that acts on the flap is very big, needs very large valve rod power to open.In order greatly to reduce valve rod power, this structure is transformed into the major and minor flap that has pressure relief to the flap of general stop valve and seals the formula of making paper moulds.Secondary flap is very little, only just can open secondary flap with very little valve rod power.The pressure P h of major and minor flap epicoele is released by the relief hole on the main valve clack, make major and minor flap assembly parts upper cavity pressure Ph equal valve export pressure P C.Therefore, only need very little valve rod power just can make whole major and minor flap structure be accompanied by the unlatching of secondary flap and unlatching smoothly automatically.

When valve closing, under very little valve rod power effect, the main valve clack sealing surface contacts and guarantees low pressure seal with valve body sealing surface; Secondary flap sealing surface and auxiliary-seat sealing surface rely on the given pretightening force of butterfly spring of design, guarantee low pressure seal.The throttling groove that the import medium puts by pressure-bearing enters the epicoele of major and minor flap assembly parts.The entrance pressure hole that covers by flap enters the inner chamber of major and minor flap assembly parts again.The pressure medium Ph of major and minor flap assembly parts epicoele equals valve inlet pressure medium Pg, and the high-pressure medium power that acts on the major and minor flap assembly parts makes valve reach self-pressure-sealed.The big more sealability of its pressure is good more.2～4 butterfly springs are equipped with on secondary flap seat top, and bigger valve rod power or the mistake load that produces are suddenly born by the supporting sleeve that is installed in the valve rod head, guarantee that its initial tension of spring maintenance under any circumstance of secondary flap is constant.Protect secondary flap not to be damaged, and can guarantee main valve clack sealing pair sealing force required when low pressure again.

When valve opening, at first use very little valve rod power open auxiliary flap, the import high-pressure medium is by the matching gap between valve body and the major and minor flap assembly parts,, released by the main valve clack relief hole through after the throttling repeatedly at the throttling groove place on pressure-bearing cover top.At this moment, the upper cavity pressure Ph of major and minor flap assembly parts and valve export pressure P C balance each other.Because pressure-bearing cover external diameter is greater than footpath in the main valve clack sealing surface, under the effect of medium differential pressure, the whole sealing configuration of major and minor flap assembly parts is successfully opened automatically along with the unlatching of secondary flap.

The utility model is owing to adopted self-pressure-sealed principle and from pressure relief, greatly reduced valve rod power, adopt the valve rod power of the self-pressure type stop valve of this major and minor flap assembling unit structure, have only 1/16～1/90 of the general stop valve valve rod of inside nominal diameter 80mm～400mm power.Therefore, the structure of valve has outstanding volume little, in light weight, and processing ease is installed the characteristics such as convenient of overhauling.Adopt the high pressure of this major and minor flap assembling unit structure, big latus rectum self-pressure type stop valve, also do not need to install additional energizing driver structure.

The self-pressure type stop valve of this major and minor flap assembling unit structure, when valve opening, secondary flap sealing surface freely aligns, and relief hole is horn-like, and the pressure release fluid is unblocked, and relieving characteristics is good.

Because the supporting sleeve structure has been installed, for the big latus rectum self-pressure type stop valve that adopts this major and minor flap assembling unit structure, the physical dimension of its secondary flap still can be very little, makes valve mechanism compact more.

When valve opening, the butterfly spring power of secondary flap top is eliminated automatically, and secondary flap is opened non-resistance, and pressure release is thorough.Therefore, main valve clack need not valve rod power and just can open automatically.Vibration and water hammer in the time of simultaneously also can avoiding out valve.

Owing to adopt self-pressure-sealed principle, so the valve seal performance is good.

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is the sectional drawing according to the major and minor flap assembly parts of self-pressure type stop valve of the present utility model proposition.

Describe details in detail below in conjunction with Fig. 1 according to the concrete device that the utility model proposes.

This device comprises main valve clack (1), above behind the pile-up welding hard alloy, through the main valve clack sealing surface (23) and the auxiliary-seat sealing surface (19) of machining, and be processed with horn-like relief hole (10).Main valve clack (1) welds together with pressure-bearing cover (3), and pressure-bearing puts and has throttling groove (17).Pressure-bearing cover (3) is threaded with the flap lid (8) that has entrance pressure hole (9), and fastening by screw (7).Valve rod (15) head is processed a circular hole (20), and butterfly spring (6) is embedded in valve rod (15) the head circular hole (20), then secondary flap seat (14) is placed on the butterfly spring below.The secondary flap (2) that has sealing surface (21) relies on to be split volution (11) and is fixed in valve rod (15) the head circular hole (20), splits volution (11) and is connected with valve rod (15) head threads, locatees with locking pad (12).The supporting sleeve (4) that has hole (13) is threaded with valve rod head (15), and is fixing with screw (5).In the scope between angle △ α=15 '～1 between main valve clack sealing surface (23) and the valve body sealing surface (22) ° (seeing accompanying drawing 3).

Fig. 2 is the sectional drawing of most preferred embodiment of the present utility model.

The working condition of the concrete device that foundation the utility model proposes is described below in conjunction with Fig. 2.

When clockwise rotating handwheel (24), valve rod (15) is being with major and minor flap assembly parts to move downward, when moving to the valve closing position, apply very little valve rod power, make the sealing surface (21) and the pre-tightening seal of the auxiliary-seat sealing surface (19) on main valve clack (1) top of secondary flap (2).At secondary flap (2) with have under supporting sleeve (4) effect of hole (13), main valve clack sealing surface (23) contacts with the sealing surface (22) of valve body (18).At this moment, the import medium through the laggard epicoele of going into major and minor flap assembly parts of throttling repeatedly, enters the inner chamber of major and minor flap assembly parts through the throttling groove (17) on pressure-bearing cover (3) top again through the entrance pressure hole (9) on the flap lid (8).Epicoele and chamber pressure Ph equal medium inlet pressure Pg, and under the effect of high-pressure medium power, whole major and minor flap sealing is paid self-pressure-sealed.

When rotating counterclockwise handwheel (24), valve rod (15) at first is being with secondary flap (2) to move upward and is being opened secondary flap (2).The high-pressure medium of import is through the matching gap between valve body (18) and the major and minor flap assembly parts, locates to be released by the relief hole (10) on the main valve clack (1) through after the throttling repeatedly at the throttling groove (17) on pressure-bearing cover (3) top.At this moment, the upper cavity pressure Ph of major and minor flap assembly parts and valve export pressure P C balance each other.Because pressure-bearing cover (3) external diameter is greater than the middle footpath of main valve clack (1) sealing surface, under the medium differential pressure effect, the whole sealing configuration of major and minor flap assembly parts is opened automatically smoothly along with the unlatching of secondary flap (2).

Fig. 2 is the most preferred embodiment that adopts the self-pressure type stop valve of major and minor flap assembly parts.Except that major and minor flap assembly parts, the selection of other component, manufacturing are all identical with general stop valve.

Material is decided according to medium.The seal face materials of this major and minor flap assembly parts is a cemented carbide, its main valve clack (1), secondary flap (2), pressure-bearing cover (3), supporting sleeve (4), split volution (11), flap lid (8), secondary flap seat (14) after the machining moulding, details by accompanying drawing 1 explanation is assembled, and can produce the self-pressure type stop valve.

Claims (5)

1, the major and minor flap assembly parts of a kind of self-pressure type stop valve, it is characterized in that by main valve clack [1], secondary flap [2], pressure-bearing cover [3], supporting sleeve [4], split volution [11], belleville spring [6], secondary flap seat [14], flap lid [8] is formed, pressure-bearing cover [3] can be processed into integral body with main valve clack [1] or decompose after processing integrally welded.

2, the main valve clack (1) in the major and minor flap assembly parts according to claim 1, it is characterized in that in the scope between angle △ α=β-α=15 '～1 ° between main valve clack sealing surface (23) and the valve body sealing surface (22), the sealing surface (23) of main valve clack (1) can be the plane or the conical surface with valve body sealing surface (22) simultaneously, relief hole (10) on the main valve clack (1) can be a different shape, but is good with straight-through bellmouth orifice.

3, the pressure-bearing cover (3) in the major and minor flap assembly parts according to claim 1, it is characterized in that the throttling groove (17) on the pressure-bearing cover (3) can increase and decrease according to operating conditions, generally between 2～6, the outer surface of throttling groove (17) can surfacing one deck cemented carbide, according to the material difference of pressure-bearing cover (3), can not spray yet.

4, the secondary flap (2) in the major and minor flap assembly parts according to claim 1, it is characterized in that the sealing surface (21) of secondary flap (2) and the auxiliary-seat sealing surface (19) of main valve clack (1) can be the plane or the conical surface simultaneously, between valve rod (15) head circular hole (20) and the secondary flap seat (14) 2-4 belleville spring (6) is housed, according to the operating conditions difference, also shock mount not, directly putting into secondary flap seat (14) flexibly connects valve rod (15) and secondary flap (2) by splitting volution (11), nature centering, fixing by locking pad (12).

5, the supporting sleeve (4) in the major and minor flap assembly parts according to claim 1, it is characterized in that being drilled with hole (13) on the supporting sleeve (4), treat that secondary flap (2) installs after, supporting sleeve (4) is contained in valve rod (15) head, after mixing up size, fastening with screw (5).

Images