CN2170417Y - Liquid gas pressure self-equilibrating stop valve - Google Patents

Abstract

The utility model relates to a stop valve, particularly a liquid and gas pressure self-equilibrating stop valve. The utility model is composed of a valve flap, a valve base, a valve body, a valve cap and a valve rod. 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 rod, the lower valve rod and a lower valve body are arranged in an 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 equilibrates by self. The utility model does not enlarge the valve body of the existing stop valve, and only changes the structure of a start and stop part of the existing stop valve, and the pressure self-balancing characteristic of the stop valve is reached. The utility model is suitable for middle and high pressure liquid and gas pipelines in oil, chemical industry, etc.

Description

Liquid gas pressure self-equilibrating 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 oil, chemical industry, pharmacy and tap water, mainly form by flap, valve seat, valve body and valve rod etc.This stop valve because flap is subjected to the influence of valve body inlet pressure, causes the valve closing difficulty when throttle down, 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 be situated between solves the existing in prior technology problem, has become the higher scientific research task of difficulty that needs to be resolved hurrily in the current stop valve technical field.

Order of the present utility model is to provide a kind of novel liquid, gas pressure self-balancing stop valve for the shortcoming that overcomes prior art.It has not only kept the advantage of prior art, but also has under the condition that does not increase existing stop valve valve body liquid, the pneumatic self-balance characteristic that realizes flap, makes that valve opening and closing is very light, reliable operation and method for making be easy.The utility model is particluarly suitable for using in middle and high hydraulic fluid, the feed channel.

Liquid, gas pressure self-balancing stop valve according to the utility model making, it mainly is made up of 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 body cavity, lower Disc and lower valve rod are fixedly connected, last flap forms motive sealing with body cavity by seal ring and connects, lower valve rod passes the pilot hole of flap, living with the bottom of upper valve rod and connect in its top, is respectively equipped with sealing surface at the top of last flap top and lower valve rod.Working principle of the present utility model is: when stop valve of the present utility model with after liquid, atmospheric pressure pipeline connect, stop valve still is in closed condition, and valve body inlet liquid, gas 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 top be adjacent to the formation selfsealings on the flap inner side surface at this moment; Act on, pressure on the lower Disc inner side surface constitutes a pair of equal and opposite in direction, direction is opposite and have the self balancing power that increases and reduce characteristics with the valve body inlet pressure simultaneously, because the set sealing surface in lower valve rod top 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 in the valve inlet, atmospheric pressure is almost all let out from lower Disc certainly, 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 almost not having to continue under the valve inlet pressure 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 is along the stable distance that is displaced downwardly to lower Disc and valve base chamber of the pilot hole of last flap when very little, the sealing surface that is arranged on the lower valve rod top contacts with the sealing surface that is arranged on the flap top and forms selfsealings and take one and rise and move down, until complete throttle down.

The utility model compared with prior art, its remarkable advantage is: (one) stop valve in opening-closing process, have the valve body inlet pressure from let out, after stop valve closes, suffered liquid, pneumatic self-balance on the upper and lower flap inner side surface, guarantee that lower valve rod is in pressure self balancing state, make stop valve at various liquid, atmospheric pressure pipeline, open and close in the particularly middle and high pressure pipe road very light and valve to close quality good etc.(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, therefore have simple in structure, with low cost with implement characteristics very easily.(3) the utility model can be made 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.

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

Accompanying drawing is according to the liquid that the utility model proposes, the structural representation of gas pressure self-balancing stop valve.

Below in conjunction with drawings and Examples the utility model is done further to say in detail description.

In conjunction with the accompanying drawings, the utility model mainly is made up of last flap 7, lower Disc 2, valve seat 1, valve body 17, valve gap 9 and upper valve rod 10, lower valve rod 12.Lower Disc 2 is arranged in the valve body 17, and lower Disc 2 is fixedly connected with lower valve rod 12, and lower Disc 2 can move up and down in valve body 17 with lower valve rod 12, forms the unlatching of stop valve or closes; Lower valve rod 12 passes the pilot hole 15 of flap 7, lower valve rod 12 tops are provided with the sealing surface 13 that is shaped as circular cone or plane and can be before valve closing contact with the sealing surface that is shaped as circular cone or plane 20 that is arranged on flap 7 tops and form selfsealings, and carry flap 7 and move down, also be provided with outlet 18 that through hole 16 makes valve body 17 on the lower valve rod 12 and connect chamber 11 with valve rod and link up; Last flap 7 is arranged on inlet 3 upsides of valve body 17, and connects by seal ring 19 formation motive sealings with valve body 17 inner chambers 6; Valve gap 9 is fixedly connected with valve body 17, the lower end surface 14 of valve gap 9 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 14 of lower end surfaces of the upper side 8 of flap 7 and valve gap 9 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 φ 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.

2, behind the valve closing, the distance between the upper side 8 of last flap 7 and the lower end surface 14 of valve gap 9 is 3mm.

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 is mainly by flap, valve seat 1, valve body 17, valve gap 9 and valve rod are formed, it is characterized in that flap is divided into flap 7 and lower Disc 2, valve rod is divided into upper valve rod 10 and lower valve rod 12, last flap 7, lower Disc 2 and lower valve rod 12 are arranged in valve body 17 inner chambers 6, lower Disc 2 is fixedly connected with lower valve rod 12, last flap 7 forms motive sealing with valve body 17 inner chambers 6 by seal ring 19 and connects, lower valve rod 12 passes the pilot hole 15 of flap 7, living with the bottom of upper valve rod 10 and connect in its top, is respectively equipped with sealing surface 20 at the top of last flap 7 tops and lower valve rod 12,13.

2, stop valve according to claim 1, what it is characterized in that flap 7 end sealing faces 20 is shaped as conical surface or plane.

3, stop valve according to claim 1 and 2, what it is characterized in that lower valve rod 12 top seal faces 13 is shaped as conical surface or plane.