CN201262232Y - Pressure balancing type break valve - Google Patents

Abstract

The utility model provides a pressure balanced cut-off valve, which comprises a valve body, a valve base, a valve flap, a valve stem, a threaded sleeve and an upper sealing threaded sleeve. A fluid flow passage is formed on the valve body; the valve base is mounted at the middle part of the fluid flow passage in an inner cavity of the valve body through threads; the valve flap is arranged on the valve base and connected with the lower end of the valve stem; a hand wheel is mounted at the upper end of the valve stem; the inner and the outer surfaces of the threaded sleeve are respectively connected with the valve stem and the valve body through threads; the upper sealing threaded sleeve is mounted at the upper end of the threaded sleeve; small medium through holes are formed on the valve flap in the axial direction, and deviate from an axial line of the valve flap, so as to avoid a cambered raised head at the lower end of the valve stem from blocking the medium through holes, thereby ensuring the smoothness of mediums. The utility model has the advantages of simple and reasonable structure, convenient operation and reliable sealability, effectively eliminates working pressure difference between the upper end and the lower end of the valve flap, and is particularly used for high-pressure and large-caliber cut-off valves.

Description

The pressure balance type stop valve

Technical field

The utility model relates to a kind of valve, particularly a kind of pressure balance type stop valve.

Background technique

At present, stop valve has been widely used in industries such as electric power, waterpower, chemical industry, oil refining, metallurgy.Existing stop valve mainly is made up of valve body, valve seat, flap, valve rod and swivel nut, on valve body, offer medium channel, valve seat is loaded on the middle part of valve body medium passage by screw thread, flap places on the valve seat, flap links to each other with the lower end of valve rod, the handwheel of the upper end dress of valve rod, the inside and outside surface of swivel nut is connected with valve body with valve rod respectively by screw thread.Handwheel by the rotation valve rod top during work drives valve rod and rotates, and by the threaded function between valve rod and swivel nut, thereby makes on the flap of valve rod and lower end thereof/motion down, and flap is opened the passage of offering on the valve body/stops up, makes stop valve realization opened/closed.Yet because the medium channel of stop valve is generally non-equilibrium structure, its MEDIA FLOW is flowed into by the low side of sealing surface during unlatching, behind sealing surface from high-end outflow, like this, during valve closing, it is poor that very big pressure medium is being born at the two ends up and down of flap, produced very big upwards unbalanced force thus, make the valve closing difficulty, even can not seal, high pressure, heavy caliber stop valve are all the more so, and moment is big during operation, uses inconvenience.

The model utility content

For overcoming the deficiencies in the prior art part, the utility model provide a kind of rational in infrastructure, effectively eliminate the pressure balance type stop valve that flap upper and lower end working pressure is poor, sealability is reliable, easy to operate, be used in particular for high pressure, bigbore stop valve.

The technological scheme that its technical problem that solves the utility model adopts is: comprise valve body, valve seat, flap, valve rod, swivel nut and go up the sealing swivel nut, on valve body, offer the fluid passage, valve seat is loaded on the middle part of body cavity fluid passage by screw thread, flap places on the valve seat, flap links to each other with the lower end of valve rod, the handwheel of the upper end dress of valve rod, the inside and outside surface of swivel nut is connected with valve body with valve rod respectively by screw thread, be equipped with in the upper end of swivel nut and seal swivel nut, it is characterized in that: it axially offers the flap small through hole in the flap upper edge.Like this, make pressure medium enter the swivel nut inner chamber of sealing by this hole by the flap lower end, the suffered pressure medium in two ends is in a basic balance up and down thereby make flap, and the suffered axial medium active force of flap just can be cancelled out each other, steering force minimum when realizing valve opening and closing, when throttle down, external force only need provide the frictional force that overcomes flap and valve rod, and the necessary seal pressure of sealing surface, and need not overcome bigger medium active force, easy to operate, improved the sealing reliability of valve simultaneously.

Above-mentioned medium through hole departs from the axis of flap, with the arc plush copper of avoiding the valve rod lower end it is stopped up, and guarantees the unimpeded of medium.

The beneficial effects of the utility model are: it is simple and reasonable for structure, and it is poor, easy to operate to eliminate flap upper and lower end working pressure effectively, and sealability is reliable, is used in particular for high pressure, bigbore stop valve.

Description of drawings

Fig. 1 is the utility model embodiment's a structural representation.

Among the figure: 1 is valve body, and 2 is valve seat, and 3 is flap, and 4,5,8 and 9 is seal ring, and 6 is swivel nut, and 7 is valve rod, and 10 is last sealing swivel nut, and 11 is locking nut, and 12 is handwheel, and 13 is the hexagonal flange nut, and 14 is medium channel, and 15 is the flap small through hole.

Embodiment

Below in conjunction with drawings and Examples, the utility model is further specified:

The utility model comprises valve body 1, valve seat 2, flap 3, valve rod 7, swivel nut 6 and goes up sealing swivel nut 10.Offer medium channel 14 on valve body 1, valve seat 2 is loaded on the middle part of valve body 1 inner chamber medium channel 14 by screw thread, and leans on the tight contact on convex shoulder plane to realize sealing; Flap 3 places on the valve seat 2, and the external conical shape sealing surface of flap 3 and the inner conical sealing surface of valve seat 2 form sealing pair, and flap 3 links to each other with the lower end of valve rod 7, the handwheel 12 of the upper end dress of valve rod 7 and hexagonal half blue nut 13.Swivel nut 6 places on the valve rod 7 by thread bush, and flap 3 seals by seal ring 4 with the mating part of swivel nut 6, and swivel nut 6 outer surfaces and valve body 1 form to seal by threaded engagement and by seal ring 5 and prevent that medium from leaking outside.Sealing swivel nut 10 is equipped with by screw thread in the upper end of swivel nut 6, and provides sealing by seal ring 9; Last sealing swivel nut 10 then provides sealing by seal ring 8 with the mating part of valve rod 7, and is equipped with and the locking nut 11 of valve rod 7 by threaded engagement in the upper end of last sealing swivel nut 10.It axially offers the flap small through hole 15 of off-axis in flap 3 upper edges.Like this, the middle part of swivel nut 6 has just formed an airtight space, the medium through hole of pressure medium by flap 3 just enters into behind this space that the upper end to flap 3 has produced a very big downward thrust, the upwards active force that gives in order to balance flap 3 lower end media.

During operation, unclamp locking nut 11 earlier, turn handwheel 12 then and drive valve rod 7 rotations, the threaded function by valve rod 7 matches with swivel nut 6 just can realize the lifting of valve rod 7, drives flap 3 and makes lifting moving together, thereby realize the keying of valve.

Claims (2)

1, pressure balance type stop valve, comprise valve body, valve seat, flap, valve rod, swivel nut and go up the sealing swivel nut, on valve body, offer the fluid passage, valve seat is loaded on the middle part of body cavity fluid passage by screw thread, flap places on the valve seat, flap links to each other with the lower end of valve rod, the handwheel of the upper end dress of valve rod, the inside and outside surface of swivel nut is connected with valve body with valve rod respectively by screw thread, be equipped with in the upper end of swivel nut and seal swivel nut, it is characterized in that: it axially offers medium through hole in the flap upper edge.

2, pressure balance type stop valve according to claim 1, it is characterized in that: above-mentioned medium through hole departs from the axis of flap, with the arc plush copper of avoiding the valve rod lower end it is stopped up.

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