CN2564802Y

CN2564802Y - Hydraulic and air pressure self-balance stop valve

Info

Publication number: CN2564802Y
Application number: CN 02263850
Authority: CN
Inventors: 周君; 周晓
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2002-08-21
Filing date: 2002-08-21
Publication date: 2003-08-06
Anticipated expiration: 2012-08-21

Abstract

The utility model discloses a hydraulic and air pressure self-balance stop valve, which is composed of a valve body, a valve clack, a seal ring, a valve rod, a valve cap, etc. The utility model is characterized in that the valve body is provided with a passage, and the upper end surface of the passage is provided with a sealing surface; the valve clack is arranged in an inner cavity of the valve body, the lower end surface of the valve clack is provided with the sealing surface, and the valve clack is also provided with a balancing hole; the seal ring is arranged in an annular groove formed between an upper cavity of the valve body and an outer circle of the valve clack, the valve rod is penetrated through the valve cap, the lower end part of the valve rod is movably connected with the upper end part of the valve clack, and the valve cap is fixedly connected with the valve body. The utility model can realize the pressure self-balancing characteristic of the existing stop valve only via changing the inner structure of the existing stop valve without enlarging the valve body of the existing stop valve, and the utility model not only can be widely used for various pressure pipelines for petrochemical industry, oilfields, metallurgy, heat power plant, etc., but also can be used for high-temperature and high-pressure pipelines having large diameter which can not be utilized by the existing stop valve.

Description

Liquid, gas pressure self-balancing stop valve

One, affiliated technical field

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

Two, background technique

Ducted stop valves such as petrochemical industry, oil field, metallurgy and thermoelectricity plant mainly are made up of valve body, flap, valve rod and valve gap etc.When this stop valve is closed, because the pressure medium of valve body inlet acts on flap one side, and be directly delivered on the operating valve lever, operate very difficult, its degree is aggravated with the rising of pipeline medium pressure and the increase of valve latus rectum, have a strong impact on the sealability and the operability of valve, also restricted the application of stop valve on high pressure, big latus rectum pipeline.In order to address this problem, a kind of plunger type self balancing stop valve has appearred, because the seal ring of this valve is arranged in the groove between plunger and valve body, rely on the elasticity and the density of seal ring self to reach seal request, the sealing material that can satisfy this performance requirement at present is a rubber etc. only, so this valve is only applicable to the not high media environment of temperature.

Three, summary of the invention

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 stop valve valve body, make that valve operation is very light, good seal performance, the media environment that can be used for all temps, reliable operation and method for making be easy.

The technical solution that realizes the utility model purpose is: a kind of liquid, gas pressure self-balancing stop valve, it comprises valve body, flap, seal ring, valve rod and valve gap, flap is provided with the outlet that makes valve body and connects the equalizing orifice that the chamber is linked up with valve rod, it is characterized in that being provided with in the valve body passage, on the upper-end surface of passage, be provided with sealing surface, flap is arranged in the body cavity, the flap lower end surface is provided with sealing surface, also be provided with equalizing orifice on the flap, seal ring is arranged in the annular groove that is constituted between valve body epicoele and the flap cylindrical, valve rod passes valve gap, and the valve rod underpart connects with the flap upper end portion is movable, and valve gap and valve body are fixedly connected.

Principle of the present utility model is: when stop valve of the present utility model with after pressure piping connects, stop valve is in closed condition, flap is under the promotion of valve rod, on the flap lower end surface on set sealing surface and the valve channel upper-end surface set sealing surface be adjacent to, when pressure medium when valve body inlet enters, medium can't be from flowing out between the sealing surface and between flap cylindrical and the seal ring, this moment liquid, atmospheric pressure acts on the circumferential surface of flap, the radial force that flap forms is cancelled each other, axial force to flap is zero, make flap be in pressure self balancing state, when pressure medium when valve outlet enters, medium can't flow out between valve gap lower end surface and seal ring, at this moment liquid, atmospheric pressure acts on the lower end surface of flap, and is passed to the upper-end surface that valve rod connection chamber acts on flap by set equalizing orifice on the flap, form the opposite self balancing power of a pair of direction along axially going up of flap, when the utility model was in opening process, under the pulling of valve rod, flap was raised until the complete opening valve.

The utility model compared with prior art, its remarkable advantage is: 1, good operation performance, the keying moment of valve only is 1/13～1/40 of existing high-pressure stop valve, manually operated valve series, do not need by any just artificial direct control of force assistance device that adds, mortor operated valve series, required motor power (output) only are 1/tens of existing Electric Actuated Stop Valves; 2, good seal performance does not have between sealing surface in the opening-closing process of valve and rubs relatively and be difficult for weighing wounded, and the existing stop valve of the valve rod that is disposed is much thin, has alleviated the wearing and tearing of valve rod to stuffing box packing, leaks in valve is difficult for and leaks outside; 3, widened the application area of stop valve, the utility model has not only kept whole advantages of existing stop valve technology, also is specially adapted to the big latus rectum high-temperature and pressure pipeline that existing stop valve can't use; 4, good price performance.Manually operated valve cost and existing stop valve basically identical, the existing stop valve of mortor operated valve series is low approximately by 20%～30%, has strengthened interchangeability of parts and versatility simultaneously, be more convenient for maintenance and seriation large-scale production.

Four, description of drawings

Fig. 1 is a kind of structural representation of liquid of the present utility model, gas pressure self-balancing stop valve.

Fig. 2 is that liquid of the present utility model, gas pressure self-balancing stop valve a kind of is used for the not high and sealing pair schematic representation of the particular surroundings that seal request is tight especially of medium temperature.

Five, embodiment

Below in conjunction with accompanying drawing the present invention is further described.

Embodiment 1.In conjunction with the accompanying drawings 1, the utility model mainly is made up of valve body 1, flap 4, equalizing orifice 5, seal ring 6, valve rod 7, valve gap 8 etc.Be provided with passage 18 in the valve body 1, be provided with sealing surface 2 on the upper-end surface of passage 18, it is shaped as conical surface, plane or sphere; Flap 4 is arranged in valve body 1 inner chamber 13, flap 4 lower end surfaces 15 are provided with sealing surface 17, it is shaped as conical surface, plane or sphere, constitute sealing pair (another kind of sealing pair is seen accompanying drawing 2) with set sealing surface 2 on the valve body 1, flap 4 is provided with equalizing orifice 5, makes valve body 1 outlet 16 that places flap 4 lower end surfaces 15 connect chamber 9 with the valve rod that places flap 4 upper-end surfaces 10 and links up; Seal ring 6 is arranged on valve body and enters the mouth in the annular groove that is constituted between valve body 1 epicoele 12 of 3 upsides and flap 4 cylindricals 14, and compress seal ring 6 by valve gap 8 lower end surfaces 11, make obtain between flap 4 cylindricals 14 and the valve body 1 that motive sealing connects and valve gap 8 lower end surfaces 11 and valve body 1 between the acquisition static seal connect; Valve rod 7 passes valve gap 8, and valve rod 7 underparts and flap 4 upper end portions are movable to be connected, and valve rod 7 portability flaps 4 move up and down in valve body 1 inner chamber 13, the unlatching of formation stop valve or close; Valve gap 8 is fixedly connected with valve body 1.When the upper and lower unanimity of cylindrical 14 sizes of flap 4, its using effect the best.

Embodiment 2.In conjunction with the accompanying drawings 2, other are with embodiment 1, and its difference is that another kind of sealing pair of the present utility model mainly is made up of valve body 1, valve seat 22, flap 4, seal ring 19 etc.Valve seat 22 is arranged on the valve body 1, and it is shaped as the ring of projection, and valve seat 22 is provided with sealing surface 21; Seal ring 19 is arranged in the annular groove 20 of flap 4, constitutes sealing pairs with valve seat 22 sealing surfaces 21, when the cylindrical 14 of the excircle dimension of valve seat 22 and flap 4 is measure-alike, and its using effect the best.

Claims

1, a kind of liquid, gas pressure self-balancing stop valve, it comprises valve body [1], flap [4], seal ring [6], valve rod [7], valve gap [8], flap [4] is provided with the outlet [16] that makes valve body [1] and connects the equalizing orifice [5] that chamber [9] is linked up with valve rod, it is characterized in that being provided with in the valve body [1] ladder passage [18], on the upper-end surface of ladder passage [18], be provided with sealing surface [2], flap [4] is arranged in valve body [1] inner chamber [13], flap [4] lower end surface [15] is provided with sealing surface [17], also be provided with equalizing orifice [5] on the flap [4], seal ring [6] is arranged in the annular groove that is constituted between valve body [1] epicoele [12] and flap [4] cylindrical [14], valve rod [7] passes valve gap [8], valve rod [7] underpart connects with flap [4] upper end portion is movable, and valve gap [8] is fixedly connected with valve body [1].

2, liquid according to claim 1, gas pressure self-balancing stop valve, what it is characterized in that flap [4] goes up set sealing surface [17] is shaped as conical surface, plane or sphere.

3, liquid according to claim 1, gas pressure self-balancing stop valve, what it is characterized in that valve body [1] goes up set sealing surface [2] is shaped as conical surface, plane or sphere.

4, liquid according to claim 1, gas pressure self-balancing stop valve is characterized in that seal ring [19] is arranged in the annular groove [20] of flap [4] lower end surface [15].

5, liquid according to claim 4, gas pressure self-balancing stop valve is characterized in that the set passage of valve body [1] [18] upper end portion is provided with the round ring seat [22] of projection, and its upper-end surface is provided with sealing surface [21].