CN205689788U - A kind of passive pressure self-balancing gate valve - Google Patents

Abstract

This utility model relates to a kind of passive pressure self-balancing gate valve, and it includes: described gate valve body offers the first valve pocket, the second valve pocket and the 3rd valve pocket being interconnected, and described 3rd valve pocket is positioned at the connectivity part of described second valve pocket and described first valve pocket；Guillotine mechanism, described guillotine mechanism is movably arranged in described 3rd valve pocket, for controlling described first valve pocket and the break-make of described second valve pocket；Described pressure balance mechanism is connected with described 3rd valve pocket and described first valve pocket respectively；Described pressure balance mechanism includes tank body, the cylinder being fixed in tank body and the piston being connected with described first valve pocket, described cylinder includes the sealing pipe that one end is connected and the hollow out pipe being connected with the described sealing pipe other end with described 3rd valve pocket, and described piston is slidably disposed in described hollow out pipe and described sealing pipe.Utilize piston self perception the first valve pocket and the pressure differential of the 3rd valve pocket, it is not necessary to measured by other measurement apparatus, it is not necessary to external force gets involved.

Description

A kind of passive pressure self-balancing gate valve

Technical field

This utility model belongs to industrial equipment field, relates to a kind of gate valve, is specifically related to a kind of passive pressure from flat Weighlock valve.

Background technology

Gate valve is applied widely in fluids industry, and most of gate valve to bear the biggest pressure in tubing By force, so the mechanical stability of gate valve is had at a relatively high requirement, also require that gate valve can be just under bigger pressure simultaneously Normally open and close.

Common gate valve is the overall maximum pressure that be should bear when only accounting for it at full medium when design, the most false If gate valve high side pressure is equal with the pressure in valve pocket.But gate valve can exist " Boiler effect " under special operation condition, the most extremely External heat source under operating mode acts on valve inner, makes the actual pressure in valve pocket more than the on high-tension side pressure of flashboard, this time gating Two sealing surfaces of plate upstream and downstream can be close to valve seat simultaneously, then needs two frictions overcoming flashboard with valve base chamber when opening gate valve Power.The valve pocket produced when " Boiler effect " reaches certain limit, the design of gate valve drive mechanism with the on high-tension side pressure differential of flashboard Open moment to will be unable to overcome flashboard and the frictional force of two valve base chambers, cause valve to open, when pressure continues to raise, The mechanical stability of valve itself and sealing will be destroyed.In actual applications, for preventing the generation of " Boiler effect ", Need timely perception valve pocket pressure differential on high-tension side with flashboard and balanced in time, but flashboard for sluice valve high-pressure side is intrinsic pressure with valve pocket Power difference is more difficult to measure, and removal pressure differential the most more difficulty the most in time after mensuration.

Summary of the invention

This utility model purpose is to provide a kind of passive pressure self-balancing lock to overcome the deficiencies in the prior art Valve.

For reaching above-mentioned purpose, the technical solution adopted in the utility model is: a kind of passive pressure self-balancing gate valve, It includes:

Gate valve body, described gate valve body offers the first valve pocket, the second valve pocket and the 3rd valve pocket being interconnected, described 3rd valve pocket is positioned at the connectivity part of described second valve pocket and described first valve pocket；

Guillotine mechanism, described guillotine mechanism is movably arranged in described 3rd valve pocket, is used for controlling described first valve Chamber and the break-make of described second valve pocket；

Pressure balance mechanism, described pressure balance mechanism is connected with described 3rd valve pocket and described first valve pocket respectively；

Described pressure balance mechanism includes the tank body being connected with described first valve pocket, the cylinder being fixed in described tank body And piston, described cylinder includes sealing pipe that one end is connected with described 3rd valve pocket and is connected with the described sealing pipe other end Logical hollow out pipe, described piston is slidably disposed in described hollow out pipe and described sealing pipe.

Optimally, described pressure balance mechanism also includes the elastic component being arranged in described sealing pipe；Described elastic component one End is connected with described piston, and the other end is fixed on described tank body.

Optimally, the connectivity part of described first valve pocket and described second valve pocket is fixed with for coordinating described guillotine mechanism Valve seat.

Owing to technique scheme is used, this utility model compared with prior art has the advantage that this utility model Passive pressure self-balancing gate valve, by installing in tank body by hollow out pipe and sealing the cylinder that pipe forms, and within it sets Put slidably piston, utilize piston self perception the first valve pocket and the pressure differential of the 3rd valve pocket, it is not necessary to measure dress by other Put mensuration, it is not necessary to external force gets involved, and any time the most all can automatic switching on and shutoff, automaticity is the highest；When exceeding setting pressure Power difference i.e. connects the first valve pocket and the 3rd valve pocket, without lag time.

Accompanying drawing explanation

Accompanying drawing 1 is the structural representation of this utility model passive pressure self-balancing gate valve；

Wherein, 1, gate valve body；11, the 3rd valve pocket；12, the first valve pocket；13, the second valve pocket；2, valve gap；3, valve seat；4、 Guillotine mechanism；41, flashboard；42, valve rod；5, pressure balance mechanism；51, tank body；52, cylinder；521, hollow out pipe；522, seal Pipe；53, piston；54, elastic component.

Detailed description of the invention

This utility model is further described by the embodiment shown in below in conjunction with the accompanying drawings.

Passive pressure self-balancing gate valve as shown in Figure 1, mainly includes that gate valve body 1, guillotine mechanism 2 and pressure are flat Weighing apparatus mechanism 5.

Wherein, gate valve body 1 and guillotine mechanism 2 can use existing structure, particularly as follows: gate valve body 1 offers phase The first intercommunicated valve pocket the 12, second valve pocket 13 and the 3rd valve pocket 11, the 3rd valve pocket 11 is positioned at the second valve pocket 13 and the first valve pocket The connectivity part of 12；First valve pocket 12 is connected with upstream line, and the second valve pocket 13 is connected with downstream line, such first valve pocket There is higher pressure, for high-pressure side in 12；Pressure in second valve pocket 13 is less, for low-pressure side；3rd valve pocket 11 upper cover sets There is the valve gap 2 being sealed against.Guillotine mechanism 2 includes flashboard 41 and the valve rod 42 being connected with its one, and it is movably disposed In the 3rd valve pocket 11, for controlling the first valve pocket 12 and break-make of the second valve pocket 13.

Pressure balance mechanism 5 is connected with the 3rd valve pocket 11 and the first valve pocket 12 respectively, and it includes and the first valve pocket 12 phase Tank body 51, the cylinder 52 being fixed in tank body 51 and the piston 53 of connection, cylinder 52 includes that one end is connected with the 3rd valve pocket 11 Seal pipe 522 and with seal the hollow out pipe 521 that is connected of pipe 522 other end, piston 53 is slidably disposed in hollow out pipe 521 and seal in pipe 522.So when the actual pressure difference of the first valve pocket 12 and the 3rd valve pocket 11 is more than set pressure differential, cylinder In-vivo medium promotes piston 53 to move to cylinder hollow part, and the first valve pocket 12 is connected with the 3rd valve pocket 11, to avoid producing " pot Stove effect ", eliminate the gate valve that thus results in and cannot open and damage etc..

In the present embodiment, the connectivity part of the first valve pocket 12 and the second valve pocket 13 is fixed with valve seat 3, is used for and guillotine mechanism The flashboard 41 of 2 coordinates, to strengthen the sealing property of the gate valve under closed mode.

Pressure balance mechanism 5 also includes being arranged at the elastic component 54 sealed in pipe 522；One end of this elastic component 54 and piston 53 are connected, and the other end is fixed on tank body 51.The elastic force of elastic component 54 and seal length (or the elastic component 54 of pipe 522 When not producing deformation, piston 53 is to sealing pipe 522 and the distance of hollow out pipe 521 junction) need to carry out preferably, to guarantee pressure Dynamic balance mechanism 5 reliability service.Specific in the present embodiment, the material of the tank body 51 used is 304 rustless steels, overall length 300mm, internal diameter 90mm, wall thickness 5mm；The material of cylinder 52 is also 304 rustless steels, overall length 285mm, internal diameter 20mm, wall thickness 3mm, The a length of 112mm of its hollow out pipe 521；The material of piston 53 is 2Cr13, diameter 20mm, thickness 10mm；Elastic component 54 is 304 Stainless steel spring, its external diameter is 10 ~ 15mm, length 100mm, and the coefficient of stiffiness is 4000N/m；The model of guillotine mechanism 4 is Z61W- The gate valve of 160P DN500, its nominal pressure 16MPa.For avoiding " Boiler effect " to make the frictional force mistake between flashboard 41 and valve seat 3 Greatly, in design allows the first valve pocket 12 and the 3rd valve pocket 11, maximum pressure differential (i.e. set pressure differential) is 1MPa.Meanwhile, tank body 51 The connection of connection, sealing pipe 522 and the 3rd valve pocket 11 with the first valve pocket 12 all uses 304 steel pipes of φ 14 × 2.5mm specification, Particularly as follows: offering two apertures on gate valve body 1 is the manhole of 14mm so that it is respectively with the first valve pocket the 12, the 3rd valve The steel pipe of above-mentioned φ 14 × 2.5mm, to correspondence, is connected on gate valve body 1 by chamber 11 in socket weld mode.

If design allows the pressure differential between the first valve pocket 12 and the 3rd valve pocket 11 to be Pmax(to the maximum and i.e. sets pressure Difference), then when Pmax puts on piston, it is Pmax/ that piston 53 pulls on spring to the first valve pocket 12 1 side shifting, displacement K, (i.e. spring elongation length, k is the coefficient of stiffiness of spring).When putting on the pressure differential reduction on piston, spring elongation length Corresponding reduction.Cylinder 52 seal section (i.e. sealing pipe 522) length is set to (Pmax/k)+a, and wherein a is relaxing of spring length (length when i.e. spring does not produces deformation).When spring elongation is to (Pmax/k)+a, cylinder 52 starts to connect with tank body 51, can Balancing the pressure differential between the first valve pocket 12 and the 3rd valve pocket 11, when pressure differential is decreased to below Pmax, then piston 53 is at bullet Being retracted under the pulling of spring in the sealing pipe 522 of cylinder 52, piston 53 media of both sides continues isolation.In the present embodiment, when When the pressure differential of one valve pocket 12 and the 3rd valve pocket 11 reaches 1MPa, spring extended length is 1 × 106 × 3.14 × 0.012/ 4000m=0.0785m=78.5mm, spring overall length 178.5mm after stretching, now piston just arrives at hollow out pipe 521, the first valve Chamber 12 is connected with the 3rd valve pocket 11.

After this utility model passive pressure self-balancing gate valve is applied in fluid line, due to tank body 51 and cylinder Body 52 is isolated the most naturally, if less without " Boiler effect " or " Boiler effect " impact itself, it is with common Gate valve effect is identical, and guillotine mechanism 4 plays choked flow effect, and the first valve pocket 12 and the 3rd valve pocket 11 cut off naturally.When gate valve is being closed During state, if it occur that " Boiler effect " causes producing between the first valve pocket 12 and the 3rd valve pocket 11 pressure differential, connect steel pipe meeting By piston 53 two ends in pressure differential conduction to cylinder 52.If pressure differential is in the range of design allows, this utility model is non- Action can not be had by dynamic formula pressure self-balancing gate valve as common gate valve, but when pressure differential reaches to design upper limit Pmax, spring Elongation is to beyond sealing pipe 522 length, and cylinder 52 is connected with tank body 51 by the space of hollow out pipe 521, now the first valve pocket 12 Turn in connecting steel pipe with the medium in the 3rd valve pocket 11 and flowed to low pressure one end by high pressure one end, thus reducing the first valve pocket 12 and the 3rd pressure differential of valve pocket 11, when pressure differential is down to below Pmax, spring drives piston 53 to retract and seals pipe 522, the Medium in one valve pocket 12 and the 3rd valve pocket 11 continues to cut off.

Above-described embodiment only for technology of the present utility model design and feature are described, its object is to allow and is familiar with technique Personage will appreciate that content of the present utility model and implement according to this, protection domain of the present utility model can not be limited with this. All according to this utility model spirit made equivalence change or modify, all should contain protection domain of the present utility model it In.

Claims (3)

1. a passive pressure self-balancing gate valve, it includes:

Gate valve body (1), described gate valve body (1) offers the first valve pocket (12), the second valve pocket (13) and being interconnected Three valve pockets (11), described 3rd valve pocket (11) is positioned at the connectivity part of described second valve pocket (13) and described first valve pocket (12)；

Guillotine mechanism (4), in described guillotine mechanism (4) is movably arranged at described 3rd valve pocket (11), is used for controlling described First valve pocket (12) and the break-make of described second valve pocket (13)；

Pressure balance mechanism (5), described pressure balance mechanism (5) respectively with described 3rd valve pocket (11) and described first valve pocket (12) it is connected；

It is characterized in that: described pressure balance mechanism (5) includes the tank body (51) being connected with described first valve pocket (12), fixes Cylinder (52) in described tank body (51) and piston (53), described cylinder (52) includes one end and described 3rd valve pocket (11) phase The sealing pipe (522) connected and the hollow out pipe (521) being connected with described sealing pipe (522) other end, described piston (53) It is slidably disposed in described hollow out pipe (521) and described sealing is managed in (522).

Passive pressure self-balancing gate valve the most according to claim 1, it is characterised in that: described pressure balance mechanism (5) also include being arranged at the described elastic component (54) sealed in pipe (522)；Described elastic component (54) one end and described piston (53) Being connected, the other end is fixed on described tank body (51).

Passive pressure self-balancing gate valve the most according to claim 1, it is characterised in that: described first valve pocket (12) and The connectivity part of described second valve pocket (13) is fixed with the valve seat (3) for coordinating described guillotine mechanism (4).