CN2070382U

CN2070382U - Multistage throttle universal stop valve

Info

Publication number: CN2070382U
Application number: CN 90209678
Authority: CN
Inventors: 王佐才
Original assignee: Individual
Current assignee: Individual
Priority date: 1990-07-02
Filing date: 1990-07-02
Publication date: 1991-01-30

Abstract

The utility model discloses a multistage throttle universal stop valve, composed of a valve body, a valve base, a valve cover and a valve pole plunger piston. The utility model is characterized in that the surrounding of the valve pole plunger piston is additionally provided with a sleeve cylinder of double layers with interlayer space. Ring-column-shaped space which is formed from an inner sleeve cylinder and an outer sleeve cylinder is parallelly provided inside with a set of throttle rings of a ring-plate shape with holes along an axial direction. Flow guiding holes are arranged on a wall of the inner sleeve cylinder at one end close to the sealing surface of a valve flap in the plunger piston cavity of the valve. When the valve is in an opening state, the valve is lifted to a position far away from the flow guiding holes and beyond a fluid flow area by using the sealing surface of the valve flap. Thus, the direct flushing of fluid flow can be avoided, the abrasion to the valve components caused by fluid can be reduced, and the noise and the vibration in working can also be reduced.

Description

Multistage throttle universal stop valve

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

Be the recirculation (egr) valve that guarantees that Minimum Flowrate of Feed Pump adopts in the thermal power plant, for a long time, the mode that people adopt the universal cutoff valves of high-quality more and add the step-down of 5～9 grades of restricting orifice groups before it is served as this recirculation (egr) valve, to reduce the pressure difference before and after the valve, reduce current washing away and wear and tear to valve.The multistage throttle recycle valve that also has a kind of Germany ZIKESCH plant produced in recent years, the structure of this valve as shown in Figure 1, it is that high-pressure feed water is carried out throttling by plunger guide bush from bottom to top, to reach reduction valve front and back pressure reduction, minimizing cavitation and to wash away, thereby keeping valve sealing face closes tightly, reduce leakage current, prolong the working life of valve.But this valve still can not be avoided flap directly washed away by current and wear and tear, so its working life is the longest only 2 years.Fig. 1 is the structural drawing of this multistage throttle recycle valve.

In order to overcome the defective of above-mentioned valve, the utility model proposes a kind of multistage throttle universal cutoff valves that can avoid the direct washout valve flap seal of current face, make its working life more above-mentioned known technology that further raising be arranged.

The technical solution of the utility model is: around a kind of valve rod plunger of universal cutoff valves, add the double layer sleeve barrel of strap clamp sheaf space, in the annulated column shape space that this is made of inside and outside sleeve along one group of annular plate-like throttle with holes of the parallel installation of between centers, in the plunger cavity of valve, have pod apertures on the inner sleeve wall of an end of close flap sealing surface, when valve is in opening state, the flap sealing surface is risen to away from pod apertures be in outside the liquid stream vortex.

Fig. 2 in the accompanying drawing, Fig. 3 and Fig. 4 provide specific embodiment of the utility model.

Fig. 2 and Fig. 3 are the general assembly schematic representation intentions of two kinds of products of present embodiment.

Fig. 4 is that product shown in Figure 3 is at the valve opening state schematic representation.

In the accompanying drawing: (1) valve body, (2) valve seat insert, (3) valve seat, (4) outer sleeve, (5) inner sleeve, (6) throttle, (7) baffle liner, (8) seal ring (9) seal ring, (10) valve gap, (11) gland, (12) support, (13) are lived and are made, (14) bearing, (15) clamping nut, (16) valve rod plunger, (17) pod apertures, (18) valve rod plunger.

Fig. 1 in the accompanying drawing is a kind of multistage throttle recycle valve schematic representation in the known technology, comprises among the figure:

(1a) valve seat, (2a) valve body, (3a) outer sleeve, (4a) inner sleeve, (5a) valve rod plunger, (6a) valve gap, (7a) gland.

By Fig. 2, the utility model specific embodiment that Fig. 3 and Fig. 4 provide is by valve body (1), valve seat (3), the stop valve that valve gap (10) and valve rod plunger (16) or (18) are formed, its structural type is: the double layer sleeve barrel (5 that adds the strap clamp sheaf space around valve rod plunger (16) or (18), 4), in the annulus of inner sleeve (5) and outer sleeve (4) formation, along one group of annular plate-like throttle (6) with holes of the parallel installation of between centers, in the plunger cavity of valve, have pod apertures (17) on the wall of the inner sleeve (5) of an end of close flap sealing surface, when valve is in as shown in Figure 4 opening state, the flap sealing surface is risen to away from pod apertures (17) be in outside the liquid flow zone.

Here again in conjunction with architectural feature of the present utility model, introduce its advantage and technique effect:

One, flap, valve seat have been avoided the direct erosive wear of liquid stream when valve opening, make sealing surface reduce damage, thereby valve closing is not tightly, leak. The valve of its comparable known technology of life-span prolongs several times still to decades of times.

Two, owing to be provided with the multistage throttle device, make high-pressure liquid, can be reduced to the Low pressure valve that is lower than below the 1MPa, so also reduced the scouring force of fluid, further reduce wear flap, valve seat and valve body through the throttling step-down at valve internal.

Three, annular plate-like throttle with holes, make liquid be around shunting, all the compress mode of putting reduces noise and reduces vibration thereby can work under the high pressure operating mode.

Four, if valve of the present utility model is not established equalizing orifice (as shown in Figure 2) when adopting the enterprising type of flow that goes out down on the valve rod plunger, although and the lifting force of valve rod is bigger, but can be reduced by increasing modes such as the diameter of valve rod own.And valve closing power and seal pressure then can lean on fluid when valve closing and the pressure difference that forms reaches the design specific pressure of anticipation.

Five, the valve rod plunger of this novel valve also can require to be designed to pattern (as shown in Figure 3) with equalizing orifice according to working medium, thereby reduced the axial force when valve opens and closes, even adopt the Vidacare corp of 6600Nm, also can guarantee the sealing of necessity when this novel valve is closed, little by about 1/3rd than the power of closing of the recycle valve of ZIKSCH plant produced in the known technology.

Six, the valve of this model utility, laborsaving during owing to keying, do not need complex device, so this valve not only can be installed vertically but also can level install.

The utility model not only can be used as the recirculation (egr) valve of feed water pump, become guarantee power station long-term safety, economy, surely send out, expire one of optimum valve of sending out, and it also can be used as the valve of any High Pressure Difference, be widely used in industrial departments such as oil, chemical industry, to replace the stop valve of other pattern.

Claims

1, a kind of multistage throttle universal cutoff valves, form by valve body, valve seat, valve gap, valve rod plunger and double-deck plunger guide bush, it is characterized in that: between described double-deck plunger guide bush, constitute a mezzanine space, in this annulated column shape space, one group of annular plate-like throttle with holes of parallel vertically installation, in the plunger cavity of valve, have pod apertures on the inner sleeve wall of an end of close flap sealing surface, when valve is in opening state, the flap sealing surface is promoted to away from pod apertures is in outside the liquid flow zone.