CN2602237Y - Piston type double packing stop valve - Google Patents

Abstract

The utility model belongs to an improved disconnecting valve, which is mainly arranged additionally with a hard sealing ring at the joint of the cavity of a valve body and an inlet, and the hard sealing ring is arranged with an outer scalene cone face which is inosculated with an inner scalene cone face protruded at the upper part of a piston petal. When the piston petal is moved downwards, the upper part of the piston petal is supported on the hard sealing ring, and the lower part is stuffed on a lower sealing ring, thereby avoiding the leakage because the gnawing of the lower sealing ring when the piston petal moves upwards and downwards or the medium flow washes out the lower sealing ring, and also keeping the effective double seal between the piston petal and the neck of the valve body. The utility model has the advantages of flexible opening and closing, good leak-proofness, long service life, reliable usage, etc., and can be applied to transfer pipes for the petroleum, the chemical industry, the pharmacy, the foods and so on.

Description

The piston type double-sealed stop valve

Technical field

The utility model belongs to a kind of improvement of stop valve.

Background technique

Existing stop valve exists two common faults, and the one, because sealing is not tight between plunger and the Sealing, or the generation gap of washing away, wear and tear of long-time flowing medium, cause that the race of medium is emitted or water clock, influenced the working life of stop valve; The 2nd, because the rotation of the direct armrest of valve rod wheel drives the keying of controlling plunger, therefore, close or when opening shutoff valve, it is time-consuming often to require great effort, and is difficult to start plunger when serious.

The model utility content

The purpose of the utility model is to provide a kind of good airproof performance, the piston type double-sealed stop valve that is easy to open and close.

The piston type double-sealed stop valve is by a valve body that has inner chamber and communicate with import and export, be contained in the piston lobe at body cavity center, place lower sealing ring, clamping frame, upper sealing ring between inner chamber and the piston lobe successively, be contained in above the valve body and the valve gap of roof pressure on upper sealing ring and the driving mechanism composition of driven plunger lobe keying.Upper and lower seal ring is the soft seal that elastic material is made, and is provided with a hard seal ring between clamping frame and lower sealing ring, and the identical mutually outer tilted conical surface of interior tilted conical surface that protrudes with piston lobe top is arranged on this hard seal ring; When the piston lobe moves down, top, piston lobe top is combined on the hard seal ring, the bottom plug is combined on the lower sealing ring, thereby both avoided the piston lobe to move up and down or during the washing away of MEDIA FLOW, cause lower sealing ring gnaw the circle and cause leakage problem, kept the dual effective sealing between piston lobe and the valve body eck again.

In order to make the light opening and closing cut-off valve of handwheel, driving mechanism of the present utility model is except the valve rod that comprises the lower end and be connected with the piston lobe and be contained in the handwheel on the valve gap, also on valve rod, be equipped with its spiral and nibble supporting screw-casing, and an one direction thrust bearing is housed all between valve gap and screw-casing, handwheel is fixed on screw-casing top, when rotating handwheel, screw-casing is nibbled by spiral and is made the valve rod rising open piston lobe or decline closure piston lobe, avoided between valve rod and the valve gap because of getting rusty or when boning, being difficult to the disadvantage of direct rotary opening and closing.

Easily and easily see, the utlity model has keying flexibly, good airproof performance, the life-span is long, uses advantages such as reliable, can be widely used in the industries such as oil, chemical industry, pharmacy, food.

Desired embodiment is described in further detail the utility model below in conjunction with accompanying drawing.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Embodiment

The piston type double-sealed stop valve, by a valve body that has inner chamber 1a and communicate 1, place piston lobe 4, upper sealing ring 6, clamping frame 5, hard seal ring 3, the lower sealing ring 2 at valve body 1 inner chamber 1a center and and be fixed on the valve gap 10 on the valve body 1 with bolt, nut 7 and be connected the valve rod 15 of piston lobe 4 and the driving mechanism composition of actuate valve stem 15 liftings with import and export.

Valve body 1 is shaped on the circle platform in the jointing place of inner chamber 1a and import, is equipped with lower sealing ring 2, hard seal ring 3, clamping frame 5, upper sealing ring 6 on the circle platform successively, and valve gap 10 is pressed on the upper sealing ring 6.Clamping frame 5 supports upper and lower seal ring 2,6, makes it can keep relatively-stationary distance.The soft seal that upper and lower seal ring 6,2 is made for elastic material, hard seal ring 3 adopts the metal material to make, piston lobe 13 adopts stainless steel material to make the garden column, its top is provided with bulge loop, the internally oblique conical surface between this bulge loop and the cylindrical body, hard seal ring 3 upper edges make with bulge loop in the outer tilted conical surface that coincide mutually of tilted conical surface, wherein the internal diameter suitable for reading of hard seal ring 3 is slightly less than clamping frame (5) internal diameter, the end opening internal diameter of hard seal ring 3 is slightly larger than the internal diameter of lower sealing ring 2.When piston lobe 4 moves down connector on lower sealing ring 2 and hard seal ring 3 time, piston lobe 4 soft envelope imports on the one hand, lower sealing ring 2 and fluid isolation have been avoided the invalid wearing and tearing of lower sealing ring 2; On the other hand, the sealing because the piston lobe 4 and hard seal ring 3 conical surfaces are fitted firmly, and make lower sealing ring 2 slightly expansion diametrically, thus it more is adjacent on piston lobe 4 sidewalls and valve body 1 inner chamber 1a wall, make piston lobe 4 and hard seal ring 3 and soft lower sealing ring 2 reach dual sealing effectively.Between described valve rod 15 and the valve gap 10 Sealing 8 is housed, there is clamping sleeve 9 on the top on the Sealing 8, and clamping sleeve 9 usefulness bolts 17 are fixed on valve gap 10.Piston lobe 4 is connected with valve rod 15 lower ends, and the inside and outside seal degree between valve body 1, plug lobe 4 and the upper and lower seal ring 6,2 is regulated by bolt, nut 7; Valve gap 10 has certain adjusting play with valve body 1 junction, when in the using process because of wearing and tearing cause when leaking, can adjust tight nut, nut 7 is got rid of.

Driving mechanism comprises the screw-casing 14 that is contained on the valve rod 15, with nut 16 be fixed on the handwheel 13 on the screw-casing 14 and be separately fixed at valve gap 10 and screw-casing 14 bottoms and clamping sleeve 9 between one direction thrust bearing 11.

Being shaped on the spiral that cooperatively interacts between screw-casing 14 inwalls and the valve rod 15 nibbles; When rotating handwheel 13, rotating screw cover 14 makes valve rod 15 lifting freely by helical toothing, opens and closes laborsaving, convenient purpose thereby reach piston lobe 4.

Claims (5)

1, a kind of at the piston type double-sealed stop valve, comprise a valve body (1) that has inner chamber (1a) and communicate with import and export, be contained in the piston lobe (4) at valve body (1) inner chamber (1a) center, place the lower sealing ring (2) between inner chamber (1a) and the piston lobe (4) successively, clamping frame (5) and upper sealing ring (6), be contained in above the valve body (1) and the valve gap (10) of roof pressure on upper sealing ring (6) and the valve rod (15) that is connected with piston lobe (4) and the handwheel (13) of actuate valve stem (15) lifting, it is characterized in that: on, lower sealing ring (2,6) soft seal of making for elastic material, be positioned between clamping frame (5) and the lower sealing ring (2) and be provided with hard seal ring (3), this hard seal ring (3) upper edge forms the outer tilted conical surface that coincide mutually for the interior tilted conical surface that protrudes with piston lobe (4) top.

2, according to the described piston type double-sealed stop valve of claim 1, it is characterized in that: the internal diameter suitable for reading of hard seal ring (3) is identical with clamping frame (5) internal diameter, and hard seal ring (3) end opening internal diameter is slightly larger than the internal diameter of lower sealing ring (2).

3, according to claim 1 or 2 described piston type double-sealed stop valves, it is characterized in that: screw-casing (14) is housed on the described valve rod (15), between valve gap (10) and screw-casing (14) and the valve rod (15) one direction thrust bearing (11) is housed, handwheel (13) is fixed on the screw-casing (14).

4, according to claim 1 or 2 described piston type double-sealed stop valves, it is characterized in that: between described valve rod (15) and the valve gap (10) Sealing (8) is housed, Sealing (8) is gone up the top clamping sleeve (9).

5, according to the described piston type double-sealed stop valve of claim 3, it is characterized in that: between described valve rod (15) and the valve gap (10) Sealing (8) is housed, Sealing (8) is gone up the top clamping sleeve (9).