CN2189249Y

CN2189249Y - Equalising valve

Info

Publication number: CN2189249Y
Application number: CN 93222807
Authority: CN
Inventors: 陶朱秋; 王书叶
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-08-26
Filing date: 1993-08-26
Publication date: 1995-02-08
Anticipated expiration: 2003-08-26

Abstract

The utility model relates to a pressure reducing control valve which is suitable for petrochemical industry. The pressure reducing control valve is composed of an inlet connection, an outlet connection, a taper valve core, an O-ring, a valve body, a valve seat, an upper bearing block, a lower bearing block, a hand wheel, a screw rod, a slide valve, and a valve core spring. Adopting the structure of an O-shaped piston valve increases the bearing ability, and provides a user having multivariant media and pressure specification with a pressure reducing control valve which can carry out adjustment and voltage stabilization for the downstream pressure of a current pressure system and is economic and easy in use and maintenance. The utility model is universal for many media, such as gas and liquid, and is a compatible pressure reducing control valve for low, medium, and high pressure. The utility model has the characteristics of simple structure, convenient operation, low cost, easy manufacture and implementation, etc.

Description

Equalising valve

The utility model belongs to a kind of pressure reduction control valve in the mechanical industry fluid-pressure system, is applicable to medium and small in the petrochemical industry, on the basic, normal, high compression experiment device and in gas, liquid transmission system.This valve is used for the rearmounted system works pressure of pressure flow system is adjusted and voltage stabilizing.

The rearmounted system works pressure of practical pressure flow system all has requirement to its force value and stability.To select the source pressure higher for use, again by the method for decompression type voltage stabilizing, the adjustment of rearmounted system works pressure and be stabilized in the required pressure value scope than working pressure for this reason.So pressure reduction control valve is the key equipment of pressure flow system proper functioning indispensability.Domestic this class reduction valve generally is the diaphragm type structure at present, is subjected to the restriction of diaphragm material performance, and delivery pressure is usually below 2MPa.External this series products is more, its structure more complicated, and the cost height, and use existing domestic, foreign standard type reduction valve, and need a large amount of spare parts, change continually, bring extremely inconvenience to the user, the while Economy is extreme difference also.

The purpose of this utility model: in order to solve the problems of the technologies described above, and develop a kind of pressure reduction control valve, this valve just can be used for gas, the multiple working medium of liquid after only need changing the minority part easily, is applicable to the working pressure standard of basic, normal, high pressure broad.Have simple in structure, applied range, easy to use, cost is low and be easy to characteristics such as processing and implementation.

In order to realize this purpose, invention scheme of the present utility model is: be the basis with Chinese patent " pressure controlled valve " basic structure (CN20872700), develop the different with it pressure reduction control valve of a kind of function, in Figure of description, Fig. 1 provides the structural representation of this valve, and it is mainly by inlet attack (1), taper valve core (2), outlet connection (4), ring washer (6), valve body (7), following pressure block (8), last pressure block (9), screw rod (10), handwheel (11), screw (12), spring shield (13), steel ball (14), pressure adjusting spring (15), guiding valve (16), top (18), valve seat (19), O RunddichtringO (3,5,17,20) and valve core spring (21), form Deng part.It is characterized in that being equipped with in following pressure block (8) center one with its guiding valve that closely contacts (16), be pressed on the guide rod of taper valve core (2) by top (18), the conical surface of taper valve core (2) is pressed in the opening of valve seat (19) by valve core spring (21).Valve seat (19) is pressed in the bottom outlet of valve body (7) by inlet attack (1).Valve core spring (21) is crushed between the inner chamber and valve seat (19) of inlet attack (1).Guiding valve (16) is sealed by ring washer (6) and O type circle (17) with the gap of valve body (7).Valve seat (19), inlet attack (1), outlet connection (4) are to seal with O type circle (3,5,20) with valve body (7) point of attachment therebetween.Its O RunddichtringO (3,5,17,20) is to make with materials such as oil resistant rubber, fluorine rubber, silicone rubber, for changing by used medium requirement choosing.Fig. 2 provides the structural representation of taper valve core (2), is made up of die (22), the conical surface (23) and the flat conical surface (24), and its conical surface (23) is to be made by the teflon plastic material.About concrete feature and the embodiment of Fig. 1 and Fig. 2, in the Figure of description explanation, be illustrated.

Advantage of the present utility model:

A kind of decompression control method has adopted band O type circle piston valve (16) structure, improved bearing capacity, for medium and the changeable user of pressure standard provide a kind of convection current pressing system downstream pressure to regulate and voltage stabilizing, the easy economy of working service, the multiple media general of gas-liquid belongs to a kind of basic, normal, high compatible pressure reduction control valve of pressing.The throttle orifice decompression that this valve forms with distinctive taper valve core (2) and opening, orifice size not only can hand adjustments but also can be subjected to passive factor automatic control; Select for use stainless steel easily to change the sealing of O shape ring to satisfy user's specific (special) requirements as base material and various material.This valve is applicable on medium and small experimental setup of petrochemical industry or the transmission device.Have simple in structure, applied range, easy to use, cost is low and be easy to characteristics such as processing and implementation.

Below in conjunction with Figure of description, concrete feature of the present utility model and embodiment are further described.

Fig. 1 provides the structural representation of this valve.

Fig. 2 provides the structural representation of taper valve core (2).

Handwheel (11) is fixed on the screw rod (10) by screw (12), and screw rod (10) is spun in the screw on spring shield (13) top.The bottom of screw rod (10) contacts with last pressure block (9) all the time by steel ball (14), and pressure adjusting spring (15) is limited to the centre of spring shield (13) inner chamber by last pressure block (9) and following pressure block (8).Spring shield (13) is fixed on the valve body (7) by screw thread.Following pressure block (8) lower central place is pressed on the umbo place on guiding valve (16) top, guiding valve (16) bottom links by screw thread and top (18), and its groove part position, centre is with back-up ring (6) and O RunddichtringO (17) and seals gap between guiding valve (16) and valve body (7).The lower end of top (18) contacts with the guide rod on taper valve core (2) top all the time.The guide rod of taper valve core (2) makes it and can slide in the center hole of valve seat (19), and the both sides of guide rod are milled with flat scarce face can flow through medium.The lower end of taper valve core (2) is pressed to valve seat (19) by valve core spring (21), and its conical surface can be sealed up the opening of valve seat (19), or forms the conical ring throttle orifice with opening.Valve seat (19) is pressed in the bottom outlet of valve body (7) by inlet attack (1), and the gap between valve seat (19) and valve seat (7) seals with O type circle (20), and the gap between valve seat (19) and inlet attack (1) is sealed by O type circle (3).

Described back-up ring (6) is made with teflon.And described O type circle (3), (5), (17), (20) can be changed the material products that oil resistant rubber, fluorine rubber, silicone rubber etc. are suitable for mutually according to working medium is different.

Described guiding valve (16) top projection is a cambered surface, to guarantee that spring reaction power acts on the central axis of guiding valve (16) all the time, guiding valve (16) is relevant with the delivery pressure that the gap and the valve of valve body (7) require, again with require voltage stabilizing sensitivity and overshoot relevant, can select different guiding valve (16) spare parts that cooperate to meet the demands.

Described valve body (19) needs fine gtinding processing with the cylndrical surface that back-up ring (6) contacts with O RunddichtringO (17), in order to the raising of pilot pressure sensitivity.

Its conical surface part (seeing accompanying drawing 2) of described spool (2) adopts teflon quasi-plastic property material, to guarantee that reliable lasting sealing is arranged.

The controlled pressure of the utility model pressure reduction control valve output is: 0.1～20MPa; Minimum sensibility reciprocal is 0.01MPa.

The utility model pressure reduction control valve is realized purpose of design---the base reason of accent, decompression and voltage stabilizing is:

When handwheel (11) revolves screw rod (10) when falling back on uppermost position in fig-ure, screw rod (10) is through steel ball (14), last pressure block (9), pressure adjusting spring (15), following pressure block (8), guiding valve (16) (should deduct each link surface friction drag until the power that top (18) this " on add riding chain " adds on taper valve core (2) guide rod, it is very little to add that the valve insertion pressure medium compares for the influences such as pressure of taper valve core (below the place of mentioning include these influences), this moment is if calm the anger, liquid medium is imported from inlet attack (1), it compares very big with the active force that valve core spring (21) adds to taper valve core (2) jointly, must ride over the inclined-plane of taper valve core (2) on the perforated wall of valve seat (19), the valve stream is stopped up and do not have medium output, Here it is zero output state.When hand wheel (11) makes screw rod (10) pressurization downwards, make when adding power that riding chain adds to taper valve core (2) guide rod and giving the taper valve core opposition jointly greater than inlet attack (1) inner chamber pressure medium and valve core spring (21), the conical surface that will taper valve core (2) is pushed open from the valve seat opening, form the conical ring hole between the conical surface and opening, export after having made piezodielectric flow into valve insertion, the minimum part of the area of this hole cross-sectional flow area in whole valve stream plays the throttle orifice effect.MEDIA FLOW is crossed throttle orifice and must be produced pressure and fall, and is depressurized back output so flow through the piezodielectric that has of conical ring hole.The size that how much depends on the conical ring pore area that is depressurized, and pore area can be adjusted with handwheel, Here it is, and the utility model pressure reduction control valve can be adjusted the principle of pressing and reducing pressure.

The utility model pressure reduction control valve also has voltage stabilizing function, because supply voltage and factors such as frequency fluctuation, changes in environmental conditions can make the source pressure of supply valve medium produce fluctuation.After having the MEDIA FLOW of pressure surge to cross to determine the area throttle orifice, the MEDIA FLOW of its output is inevitable also can to produce pressure surge.The consumption flow device that valve carried in addition, what can alter a great deal at different operating state consumption stream, and this load variations also can produce pressure surge to the medium of permanent area throttle orifice output.In order to obtain the valve output of pressure stability, the utility model pressure reduction control valve specially designs the floating type taper valve core structure of adjustable hole area.When this valve was set up a certain delivery pressure, its taper valve core (2) position of opening was relatively determined, so the conical ring hole that plays throttling action that adapts is arranged.The reason that spool is static relatively is its stress balance.At this moment as the pressure oscillation of medium source occurring, or the downstream bearing apparatus of load occurring changes, the capital changes taper valve core (2) stress of valve, destroys the state of its original stress balance, and this makes taper valve core (2) produce displacement along central shaft above-below direction stressed appearance difference power.The structure characteristic of the utility model pressure reduction control valve makes the direction of this displacement towards compensated waving influence, and reduces gradually with the suffered poor power of this displacement taper valve core (2), makes it to reappear the stress balance state on certain position and stops displacement.Displacement has only changed conical ring throttling hole and has changed the pressure drop of its medium of flowing through, and the influence of fluctuation that pressure drop is variable compensated makes the valve delivery pressure keep basicly stable.For example: when the upstream of valve pressure medium raises for some reason, taper valve core (2) below pressure medium is strengthened to its active force; Also can raise simultaneously because of the raise pressure that the throttling hole enters valve pocket of flowing through of upstream pressure medium, guiding valve (16) pressurized useful area above in the chamber, much bigger more than taper valve core (2) pressurized useful area below the chamber, on just having reduced, their comprehensive functions add the power that riding chain adds to taper valve core (2).Taper valve core (2) makes it to top offset with regard to the poor power that occurred making progress like this, and displacement has reduced conical ring throttling pore area, simultaneously because of throttle orifice little the pressure drop increasing, make to add the power transmission of riding chain institute and reduce speed and slow down, subtract until stopping.Displacement makes valve core spring (21) decrement diminish again, and it is diminished to the active force that taper valve core (2) makes progress.The taper valve core (2) that last displacement stops at new stress balance state place mainly is that conical ring throttling hole is diminished, and pressure drop strengthens, and the pressure drop increment has compensated the rising of source pressure and made valve output keep stable.Again for example: when strengthening as the apparatus of load of valve downstream bearing, just consumption stream increases, and this will influence the decline of valve delivery pressure, and the valve pocket pressure in the valve outlet port joint descends thereupon, with in like manner last, add the riding chain pressure transmission on the valve pocket step-down will increase and give taper valve core (2) active force, destroy its stressed state of equilibrium and produce downward poor power, make taper valve core (2) to bottom offset, follow displacement that the throttle orifice crack is strengthened, pressure drop reduces, and makes to add the riding chain pressure transmission and gather way and slow down, until not subtracting.Displacement strengthens the decrement of valve core spring (21), and the upward reaction force to taper valve core (2) is strengthened.This make on the taper valve core (2) of valve poor power from large to small, stop displacement until new stressed flat rare state occurring.At this moment only make the throttle orifice crack become big and the pressure drop attenuating, the pressure drop decrement has compensated the influence that load strengthens, and makes the valve delivery pressure keep basicly stable.

Promptly constitute the utility model according to above-mentioned making---a kind of pressure reduction control valve.

Claims

1, a kind of pressure reduction control valve, it is by inlet attack (1), taper valve core (2), O RunddichtringO (3,5,17,20), outlet connection (4), back-up ring (6), valve body (7), following pressure block (8), last pressure block (9), screw rod (10), handwheel (11), screw (12), spring shield (13), steel ball (14), pressure adjusting spring (15), guiding valve (16), top (18), valve seat (19) and valve core spring (21) part are formed, wherein handwheel (11) is fixed on the screw rod (10) by screw (12), screw rod (10) is to be spun in the screw on spring shield (13) top, the bottom of screw rod (10) contacts with last pressure block (9) all the time by steel ball (14), pressure adjusting spring (15) is the centre that is limited to spring shield (13) inner chamber by last pressure block (9) and following pressure block (8), spring shield (13) is to be fixed on the valve body (7) by screw thread, it is characterized in that on the guiding valve (16) of following pressure block (8) center, one top excessively (18) being housed, and be pressed on the conical surface (23) of top guide rod of taper valve core (2).

2, control valve according to claim 1, it is characterized in that the conical surface (23) of taper valve core (2) is pressed in the opening of valve seat (19) by valve core spring (21), valve seat (19) is pressed in the bottom outlet of valve body (7) by inlet attack (1), and valve core spring (21) is crushed between the inner chamber and valve seat (19) of inlet attack (1) simultaneously.