CN2403953Y - Liquid, air pressure self-balance stop valve - Google Patents

Abstract

The utility model discloses a liquid and gas pressure self-balancing stop valve which is composed of a valve flap, a valve base, a valve body, a valve cap, a valve rod, a sealing ring, a spring, etc. The utility model is characterized in that the valve flap is divided into an upper valve flap and a lower valve flap, the valve rod is divided into an upper valve rod and a lower valve rod, the upper valve flap, the lower valve flap and the lower valve rod are arranged in the inner chamber of the valve body, and under the pressure of an inlet of the valve body, the inner chamber of the valve body seals and balances by self. The utility model does not enlarge the valve body of the existing stop valve, and only changes the structure and the start and stop part of the existing stop valve, and the pressure self-balancing characteristic of the stop valve can be realized. Therefore, the utility model is suitable for middle and high pressure liquid and gas pipeline under various temperature conditions in petrochemical industry, oil field industry, metallurgy industry, thermal power plants, etc.

Description

Liquid-gas pressure self-balancing stop valve

The utility model relates to a kind of stop valve, particularly a kind of liquid-gas pressure self-balancing stop valve.

Now be used for ducted stop valves such as petrochemical industry, oil field, metallurgy and thermoelectricity plant, mainly form by flap, valve seat, valve body and valve rod etc.During this stop valve throttle down, because flap is subjected to the influence of valve body inlet pressure, cause the valve closing difficulty, its degree is aggravated with the increase of liquid, gas inlet pressure in the pipeline, has a strong impact on the quality of closing of its working efficiency and valve.In order to address this problem, Chinese patent application (91220092.8) discloses a kind of stop valve self balancing device.This stop valve is provided with the internal bypass hole on flap, play the pressure release effect during valve opening, but because after this stop valve was in closed condition, the valve inlet pressure medium acted directly in the stem packing all the time, very easily produces external leakage.How to solve the existing in prior technology problem, become the highly difficult scientific research task that needs to be resolved hurrily in the current stop valve technical field.

The purpose of this utility model is to provide a kind of liquid, gas pressure self-balancing stop valve, its realizes liquid, the pneumatic self-balance characteristic of flap under the condition that is not increasing existing existing stop valve valve body, make that valve opening and closing is very light, good seal performance, reliable operation and method for making be easy.

Realize that the purpose of this utility model technical solution is: a kind of liquid, gas pressure self-balancing stop valve, it comprises flap, valve seat, valve body, valve gap and valve rod, it is characterized in that flap is divided into flap and lower Disc, valve rod is divided into upper valve rod and lower valve rod, last flap, lower Disc and lower valve rod are arranged in the valve body, lower Disc and lower valve rod are fixedly connected, forming motive sealing by seal ring between last flap and the valve body surface of contact connects, lower valve rod passes the pilot hole of flap, its top connects with the bottom of upper valve rod is movable, between the step surface of the upper end of last flap top end face and lower valve rod, form sealing surface, spring is arranged between the shoulder and valve body of flap.

Principle of the present utility model is: when stop valve of the present utility model with after liquid, atmospheric pressure pipeline connect, stop valve is not in closed condition as yet, and valve body inlet liquid, atmospheric pressure act on and make sealing surface that is arranged on the flap top and the sealing surface that is arranged on the lower valve rod upper-end surface be adjacent to the formation selfsealings on the flap inner side surface at this moment; Act on that pressure on the upper and lower flap inner side surface constitutes a pair of equal and opposite in direction, direction is opposite and have the self balancing power that increases simultaneously and reduce with the valve body inlet pressure, because the designed sealing surface in lower valve rod upper-end surface stops, make flap can not on move, the pressure that is born on the last flap inner side surface all is passed to lower valve rod, lower valve rod is formed thrust upwards, simultaneously, the pressure that is born on the lower Disc inner side surface forms downward thrust to lower valve rod, therefore, make lower valve rod be in pressure self balancing state fully.When the utility model is in opening process, under the effect of upper valve rod, lower valve rod just has been raised very little distance, liquid, atmospheric pressure are all let out certainly from lower Disc in the valve inlet, the upper side of flap is stopped no longer with moving on the lower valve rod by the valve gap lower end surface on this moment, and lower valve rod moves on not having under the valve inlet pressure to continue together with lower Disc, until the complete opening valve.When the utility model is in the pass closed procedure, under the effect of upper valve rod, lower valve rod moves down distance until lower Disc and valve base chamber when very little along the pilot hole of last flap is stable, be arranged on flap shoulder and spring between the valve body and the sealing surface on flap top contacted form selfsealings and take one with the sealing surface of lower valve rod upper-end surface and rise and move down, until complete throttle down.

The utility model compared with prior art, its remarkable advantage is: 1, stop valve has the valve body inlet pressure from letting out in opening-closing process, after stop valve is closed, suffered liquid, atmospheric pressure equal and opposite in direction on the upper and lower flap inner side surface, guarantee that lower valve rod is in pressure self balancing state, make stop valve in various liquid, feed channel, open and close moment in the particularly middle and high pressure pipe road and only be the influence that quality is good, not changed by medium temperature of closing of 1/tens valves of existing stop valve; 2, the utility model does not need to increase the valve body of existing stop valve, need only change the structure of the keying parts of existing stop valve, just can realize the pressure self-equilibrium characteristic of stop valve, the consumption of stem material is saved at double, therefore have simple in structure, with low cost and implement characteristics very easily; 3, this reality is done novelly can make the stop valve series product that are applicable to different pipeline drift diameter, pressure, medium, temperature according to different applications, guarantees stable and reliable for performance.The utility model is not only applicable to general liquid, atmospheric pressure pipeline, more is applicable to middle and high pressure pipe road, uses mainly as switch valve and Flow valve.

Concrete structure of the present utility model is provided by drawings and Examples.

Accompanying drawing is a kind of structural representation of liquid of the present utility model, gas pressure self-balancing stop valve.

Below in conjunction with accompanying drawing the utility model is further described.

In conjunction with the accompanying drawings, the utility model mainly is made up of flap 7, lower Disc 2, valve seat 1, valve body 20, valve gap 10, upper valve rod 11, lower valve rod 13, seal ring 17 and spring 8 etc.Lower Disc 2 is arranged in the valve body 20, and lower Disc 2 is fixedly connected with lower valve rod 13, and lower Disc 2 can move up and down in valve body 20 with lower valve rod 13, forms the unlatching of stop valve or closes; Lower valve rod 13 passes the pilot hole 18 of flap 7, lower valve rod 13 upper end step faces 14, it is shaped as conical surface, plane or sphere, can be before valve closing form sealing surface 22 contacting with the end face that is shaped as conical surface, plane or sphere 16 that is arranged on flap 7 tops under the effect of spring 8, and carry flap 7 and move down, also be provided with through hole 19 on the lower valve rod 13, make the outlet 21 of valve body 20 connect chamber 12 communications with valve rod; Last flap 7 is arranged on inlet 3 upsides of valve body 20, and connects by seal ring 17 formation motive sealings with valve body 20 inner chambers 6; Valve gap 10 is fixedly connected with valve body 20, the lower end surface 15 of valve gap 10 can in the valve opening process, limit flap 7 on move; When last flap 7 equate with the excircle dimension of lower Disc 2 or go up that flap 7 inner side surfaces 5 equate with the lifting surface area of lower Disc 2 inner side surfaces 4 and valve closing after on the distance of 15 of lower end surfaces of the upper side 9 of flap 7 and valve gap 10 when generally being not less than 1mm, its using effect the best.

Be example with liquid, the gas pressure self-balancing stop valve of making Ф 100mm now, it is as follows to disclose its main design parameters:

1, upward the external diameter of flap 7 and lower Disc 2 equates, spring 8 adopts the butterfly springs;

2, behind the valve closing, the distance between the upper side 9 of last flap 7 and the lower end surface 15 of valve gap 10 is 2.5mm.

The utility model has been obtained satisfied effect through validation trial.

Claims (3)

1, a kind of liquid, gas pressure self-balancing stop valve, it comprises flap, valve seat [1], valve body [20], valve gap [10] and valve rod, it is characterized in that flap is divided into flap [7] and lower Disc [2], valve rod is divided into upper valve rod [11] and lower valve rod [13], last flap [7], lower Disc [2] and lower valve rod [13] are arranged in the valve body [20], lower Disc [2] is fixedly connected with lower valve rod [13], forming motive sealing by seal ring [17] between last flap [7] and valve body [20] surface of contact [6] connects, lower valve rod [13] passes the pilot hole [18] of flap [7], its top connects with the bottom of upper valve rod [11] is movable, between the step surface [14] of the upper end of last flap [7] top end face [16] and lower valve rod [13], form sealing surface [22], spring [8] is arranged between the shoulder and valve body [20] of flap [7].

2, liquid according to claim 1, gas pressure self-balancing stop valve, it is characterized in that between end face [16] and the lower valve rod upper end step face [14] sealing surface be shaped as conical surface, plane or sphere.

3, liquid according to claim 1 and 2, gas pressure self-balancing stop valve is characterized in that spring [8] is the ring butterfly spring.