CN2058707U

CN2058707U - Shutoff valve

Info

Publication number: CN2058707U
Application number: CN 89205255
Authority: CN
Inventors: 华洪良; 张宝珍
Original assignee: Individual
Current assignee: Individual
Priority date: 1989-07-22
Filing date: 1989-07-22
Publication date: 1990-06-27

Abstract

The utility model relates to a stop valve. The three-ball seal stop valve is composed of a combination valve body, a channel open and closed device, a valve rod compensation type sealing device. The spherical contact seal is adopted by an inlet passage, an outlet passage, and a valve rod. The combination and compensation type seal is carried out by the valve rod adopting a spherical sealing ring and plane sealing ring under the function of a compensation spring. The structural form provides a guarantee for eradicating disadvantages of the traditional stop valve, such as serious leakage phenomenon, short service life, and large amount of repair.

Description

Shutoff valve

The utility model relates to a kind of stop valve.

Present stop valve, to the medium of the passage of flowing through is to end with the sealing that contacts of the spool of the plane or the conical surface and valve seat, valve stem part adopts packing seal, moves up and down the implementation closure or openness thereby drive spool by valve rod, and accompanying drawing 1 is the sectional view of plane sealing stop valve.The 1-valve body, 2-valve seat, 3-spool, 4-valve rod, 5-seal arrangement shell, 6-filler, 7-packing press ring, 8-pressure ring nut, 9-handwheel.This stop valve leakage phenomenon is serious, and its main cause is as follows: 1, the wearing and tearing of start-stop device.Stop valve in the course of the work, especially when closing, because the valve rod end is to the active force of spool, make the surface of contact moving linearly of the seal spool plane or the conical surface and valve seat, if the frictional force of valve rod end and spool is during greater than the frictional force of the spool and the contact surface of valve seat, plane or conical surface spool will be done rotation motion with respect to valve seat, at this moment, because the effect of friction will make the contact faying surface produce wearing and tearing, seal failure is produced leak.2, the wearing and tearing of filler.Desire to make valve stem part not produce leakage, the seal clearance of filler and valve rod must be reasonable, yet the seal clearance under the perfect condition is difficult to reach.When filler during to the sealing tension of valve rod, filler wearing and tearing aggravation, when crossing pine, seal clearance is too big again, do not have sealing effect, in addition because the defective of this filler device itself, often make filler be in " tightening down pine " state, cause the wearing and tearing of top filler to be accelerated equally, because the outlet of stop valve is general and device joins, pressure at the outlet port medium is identical with the device internal pressure, and under this situation, the gap after medium will wear and tear along filler by the matching gap of threaded stem produces leaks.In sum, existing stop valve is owing to the defective of structure itself, and in actual use, it is serious to exist leakage phenomenon, and working life is short, the big many defectives of amount of maintenance.

The purpose of this utility model is to solving the deficiency that above-mentioned stop valve brings owing to the defective of structure itself, a kind of three ball sealed stop valves are provided, this stop valve, not only inlet passage and outlet passage and valve rod are sealed respectively, and adopted the higher sphere contact seal of leakage efficiency, provide assurance for eradicating to leak.

The utility model three ball sealed stop valves are by combinaing valve body, passage start-stop device, and the valve rod compensating type sealing device is formed.Inlet passage and outlet passage and valve rod adopt sphere contact seal respectively, the revolution of valve rod moves up and down nut slider, and then the promotion spool slides in level orientation, valve is opened and closed, and the sealing of valve rod adopts spherical seal ring and plane sealing ring to carry out the sealing of combined compensation formula under the effect of counterbalance spring.

Below in conjunction with accompanying drawing the utility model stop valve is described in detail.

Accompanying drawing 2 is the utility model stop valve elevational cross-sectional view.

Accompanying drawing 3 is the utility model stop valve side view.

1, combinaing valve body is made up of valve body 10, joint chair 11, valve seat 12.

Sphere valve seat 12 is installed in the inboard of joint chair 11, bolt 15 connects joint chair 11 and valve body 10 fixing, the inner chamber of valve body is a hollow, rectangular cross section, both sides have pair spool to position and make spool to make the bar shaped slideway 29 of horizontal slip, the positioning hole 28 that the lower end has valve rod centering and compensation valve rod to move up and down.

For guaranteeing that the flow through flow of valve body of working medium equates that with institute adapter road flow valve body 10 inner chambers are after installing the passage start-stop device, the sectional area sum in space, both sides must be more than or equal to the sectional area of the pipeline that joins.Joint chair 11 inboards are provided with flange and match with valve body 10, and guaranteeing the good sealing of flange part, the outside is that screw thread or flange and pipeline join.The manufacturing key of combinaing valve body is that the center of valve body 10 and valve seat 12 must be consistent, and left and right sides valve seat and vertical center line are symmetrical.

2, the passage start-stop device is by spool 13, nut slider 14, and lower valve rod 17 is formed.

Spool 13 is connected with the trapezoidal chute 27 of nut slider 14 usefulness, and nut slider 14 is twisted mutually with the trapezoidal bolt of lower valve rod 17 and closed, and spool 13 is made symmetrical two, partable, and two ends are sphere.Be provided with chute matches with the bar shaped slideway 29 of body cavity in the both sides of spool 13, can make like this stop valve spool and valve seat when opening and closing obtain good with one heart, and be in best contact seal state, because spool and valve seat are sphere contact seal, so when in a single day off center takes place in both one, in being no more than 4.5 ° of scopes, deviation angle still can keep good sealing, the passage start-stop device is that land portions must be smooth when making for three ball sealed stop valves " heart ", necessary slippage must not have the jam phenomenon freely after all slideways were installed.

3, the valve rod compensating type sealing device is made up of seal arrangement shell 26, upper valve rod 20 counterbalance springs 18, spherical seal ring 16, plane sealing ring 19.

Seal arrangement shell 26 is made one with valve body 10.The square column borehole jack of the square cylinder of lower valve rod 17 and upper valve rod 20 is connected into one, lower valve rod is fused do revolution synchronously, also can carry out slippage up and down simultaneously within the specific limits.The sphere of lower valve rod 17 and spherical seal ring 16 fit, plane sealing ring 19 places 23 on upper valve rod 20 shoulders and gland, so two seal rings can be in the excellent contact sealing state, the extension compensating action that mainly is counterbalance spring 18 reaches, and is provided with upper gasket 24 and lower gasket 25 at the two ends of counterbalance spring 18.Whole sealing device compresses gland 23 by bolt 22 carries out correct positioning.

The key of valve rod compensating type sealing device is that the sphere of lower valve rod 17 must be good with contacting of spherical seal ring 16, and the desirable 0.3～0.6mpa of its specific contact pressure is advisable, this specific pressure be by counterbalance spring 18 be used for reach.

Making three ball sealed stop valves it should be noted that: valve body 10 should be on same center line with the installation of valve seat 12 and spool 13 in the horizontal direction; Spool 13 must slide flexibly after installation with the slideway of nut slider 14 and valve body 10, the sphere contact segment of the three balls good fit of being sure to, and area of contact should be respectively more than or equal to 70%.

Accompanying drawing 2 is that three ball sealed stop valves are in maximum opening state.When closing, handwheel 21 moves in the direction of the clock, upper valve rod 20 drives lower valve rod 17 and does revolution synchronously, the trapezoidal bolt of lower valve rod 17 moves down nut slider 14, thereby the spool 13 that promotes partable moves to valve seat along the slideway of valve body 10 inner chambers separately, all fit until spool and valve seat, inlet passage and outlet passage are ended respectively till.During unlatching, handwheel 21 is to counterclockwise rotating, and valve rod drives on the nut slider 14 and moves, because nut slider 14 and spool 13 cooperate for the trapezoidal slideway in inclined-plane, opens so spool 13 slides inwards along the body cavity slideway.

The big I of working medium flow is controlled by the distance of opening between spool and the valve seat.

Three ball sealed stop valves can select different materials make according to different working medium, if when being applied to corrosivity working medium occasion, can select the anticorrosive material manufacturing for use.

The utility model three ball seal valves have following advantages:

1, the intake channel of working media and exit passageway be regardless of direction, can be connected with pipeline arbitrarily, convenient, flexible.

2, the intake channel of working media and exit passageway seal respectively cut-off, and adopt the higher sphere-contact of leakage efficiency to seal, valve rod adopts spherical seal ring and plane packing ring combination compensation sealing, so good sealing effect of whole stop valve, can fundamentally stop a leak energy savings.

3, spool and valve seat adopt the sliding contact sealing, therefore are difficult for producing wearing and tearing, long service life.

4, reduced the maintenance work amount.

Claims

1, a kind of stop valve comprises valve body, start-stop device, seal arrangement, it is characterized in that:

(1), sphere valve seat 12 is installed in the inboard of joint chair 11, bolt 15 connects joint chair and valve body 10 fixing, the inner chamber of valve body 10 is hollow, rectangular cross sections, there is bar shaped slideway 29 both sides, the lower end is provided with positioning hole 28,

(2), spool 13 is connected with the trapezoidal chute 27 of nut slider 14 usefulness, nut slider 14 is twisted mutually with the trapezoidal bolt of lower valve rod 17 and is closed, spool is symmetrical two, two ends are sphere,

(3) seal arrangement shell 26 is made one with valve body 10, lower valve rod 17 is socketed into one with upper valve rod 20, the sphere of lower valve rod 17 and spherical seal ring 16 fit, and plane sealing ring 19 places between upper valve rod 20 shoulders and the gland 23, and the two ends of counterbalance spring 18 are provided with packing ring 24 and lower gasket 25.