CN105805326A - Three-stage perforating valve element adjusting valve - Google Patents

Abstract

The invention relates to a three-stage perforating valve element adjusting valve. The three-stage perforating valve element adjusting valve comprises a valve body, valve bases, a throttle sleeve, a valve cover, and a valve element and a valve rod integrally molded; the valve element and the valve bases are arranged in the throttle sleeve; the lower part of the valve element is connected with the valve bases; the valve rod is connected with the valve cover; the valve bases are provided with multiple valve base holes for passing through a fluid; the valve element is provided with multiple valve element holes for passing through the fluid; and the valve bases, the valve element and the throttle sleeve form a fluid channel. The three-stage perforating valve element adjusting valve has the following beneficial effects: based on a multistage pressure reducing principle, the valve element is perforated; and the valve bases as many as the valve element holes and matched with the valve element holes are arranged in the throttle sleeve, so that the fluid can reduce the pressure by degrees, the equipment damage caused by the caviation and flash evaporation phenomenon in high-pressure difference of the fluid is prevented, and the service life of the adjusting valve is prolonged.

Description

Three grades of punching spools regulate valve

Technical field

The present invention relates to a kind of three grades of punching spools and regulate valve.

Background technology

China is energy big country, the use regulating valve of high operating mode is more and more extensive, particularly in the occasion of High Pressure Difference, anti-cavitation, but these adjustment valve bases used under high working condition this abroad monopolized, domestic research and development in this respect is more delayed, it does not have autonomous product.

At present, the adjustment valve of domestic use is mainly simple single seat form, although this mode can accurately regulate pressure, the valve seat of multi-orifice valve internals can play guide effect, and vibration resistance is better.The spool (optional 1 grade, 2 grades or 3 grades) of porous has better blood pressure lowering, noise reduction, is particularly suited for gas medium.When downstream pressure is lower than the saturated vapor pressure of liquid medium, it may occur that flash distillation, fluid dispersion can be some shallow bid jets by porous spool.The flowing of fluid can cause cavitation erosion, here liquid is broken down into by the spool that punches and much restraints cavitation flow, central gas follicular rupture at valve, trim will cause any destruction and noise also can considerable degree of reduce, when valve adopts stream pass form, the energy of each jet is cancelled out each other, and reduces the erosion to trim and damages.It is exactly that the medium that flows through of requirement is pure, is otherwise blocked with runner after a period of time, it is impossible to cleaning, can only scrap.

Summary of the invention

The present invention proposes a kind of three grades of punching spools and regulates valve, because flash distillation problem causes adjustment, valve preferred dimension is excessive mainly for alleviating adjustment valve for its purpose, improves the service life of adjustment valve further.

The technical scheme is that and be achieved in that:

Three grades of punching spools regulate valve, including valve body, valve seat, throttle sleeve, valve gap and integrated spool and valve rod, described spool and described valve seat are arranged in described throttle sleeve, described spool bottom is connected with described valve seat, described valve rod is connected with described valve gap, described valve seat is provided with some valve seat orifice passed through for fluid, and described spool is provided with some spool bore passed through for fluid, and described valve seat, described spool and described throttle sleeve constitute fluid passage.

Preferably, in described fluid passage, the flow direction upper fluid of fluid flows through described valve seat, described spool and described throttle sleeve successively.

Preferably, the quantity of the valve seat orifice on described valve seat is identical with the quantity of the spool bore on described spool.

Preferably, the valve seat orifice size on described valve seat increases successively along the flow direction of fluid.

Further, described valve seat lower end is provided with noise reduction hole.

Preferably, certain gap it is provided with between described spool and described valve seat.

Preferably, described valve seat is sphere with the contact surface of described spool.

Preferably, for linear sealing between described valve seat and described spool.

Further, the face described spool contacted with described valve seat is provided with sealing surface；Or, the face that described valve seat contacts with described spool is provided with sealing surface；Or, on described spool and/or described valve seat be provided with sealing member.

The invention have the benefit that

Technical scheme provided by the invention is based on multilevel decompression principle, by punching on spool, arrange in throttle sleeve identical with spool hole count and with the use of valve seat, fluid step pressure reducing can be made, prevent the damage that fluid produces cavitation erosion when High Pressure Difference, equipment is caused by flass, and then improve the service life regulating valve.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the structural representation that three grades of punching spools described in the embodiment of the present invention regulate valve；

Fig. 2 is the partial enlarged drawing at valve seat place in Fig. 1；

Fig. 3 is the partial schematic diagram of three grades of perforations that valve seat, spool and throttle sleeve are formed；

Fig. 4 is the schematic diagram of the punching pattern of valve seat and spool.

In figure:

1, valve body；2, valve seat；3, throttle sleeve；4, valve gap；5, spool；6, valve rod；7, valve seat orifice；8, spool bore.

Detailed description of the invention

Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.

nullAs Figure 1-4，Three grades of punching spools described in the embodiment of the present invention regulate valve，Including valve body 1、Valve seat 2、Throttle sleeve 3、Valve gap 4 and integrated spool 5 and valve rod 6，Described spool 5 and described valve seat 2 are arranged in described throttle sleeve 3，Described spool 5 bottom is connected with described valve seat 2，Described valve rod 6 is connected with described valve gap 4，Described valve seat 2 is provided with some valve seat orifice 7 passed through for fluid，Described spool 5 is provided with some spool bore 8 passed through for fluid，Described valve seat 2、Described spool 5 and described throttle sleeve 3 constitute fluid passage，In described fluid passage, the flow direction upper fluid of fluid flows through described valve seat 2 successively、Described spool 5 and described throttle sleeve 3，The quantity of the valve seat orifice 7 on described valve seat 2 is identical with the quantity of the spool bore 8 on described spool 5，Valve seat orifice 7 size on described valve seat 2 increases successively along the flow direction of fluid.

Valve gap and spool have guide effect, and valve seat and spool have again one layer of guide effect, and valve serves the effect of double; two guiding.

In the fluid passage on the flow direction of fluid, fluid have passed through three road blood pressure lowering down speeding procedure, it is valve seat, spool, throttle sleeve successively, liquid flows through valve seat, spool also has throttle sleeve blood pressure lowering again after carrying out blood pressure lowering, reduce flow velocity and effectively can prevent the medium corrosion to valve body and trim, it is possible to extend the service life regulating valve.

In this example, described valve seat 2 lower end is provided with noise reduction hole.Noise reduction hole can reduce noise produced by media impingement body cavity.

In this example, between described spool 5 and described valve seat 2, it is provided with certain gap.One is avoid spool stuck by the solid particle in fluid, and two are easy for the dismounting of trim.

In this example, the contact surface of described valve seat and described spool is sphere, for linear sealing between described valve seat and described spool.Valve seat and spool contact surface are made into R face by 40 ° of original angles, original face seal convert linear sealing to, and when power output is constant, sealing surface reduces, and zero leakage is completely secured and seals.

In this example, the face that described spool contacts with described valve seat is provided with sealing surface；Or, the face that described valve seat contacts with described spool is provided with sealing surface；Or, on described spool and/or described valve seat be provided with sealing member.

What the present embodiment adopted is " valve seat+spool+throttle sleeve " three grades of throttle structures:

Once throttling--valve seat place throttles, and accounts for the 10% of overall presure drop.

Second throttle--spool place throttles, and accounts for the 30% of overall presure drop.

Three throttlings--throttle sleeve throttles, and accounts for the 60% of overall presure drop.

" valve seat+spool+throttle sleeve " three grades of throttle structures, will be divided into several less pressure drop by the pressure drop of valve, and each less pressure drop all ensures that the pressure at the minimum place of its throttleng surface is more than saturated vapour pressure, it is to avoid or alleviate the flashing effect destruction to valve.Replace conventional " pilot bushing+valve seat " mode with the sleeve throttling element of small hole injection type structure simultaneously, can thoroughly effect a radical cure the problem that pilot bushing easily pitches, small hole injection throttle structure can reduce the anti-current monolateral local failure effect to valve core case simultaneously, reduces the silent sound that throttles.Because small hole injection mode bears the major part (about 60%) of valve choke pressure drop, it is possible to by valve seat, cavitation damage effect is adjourned to aperture, protects sealing surface, improve valve service life, up to 2～3 times of ordinary high pressure difference limen.

The technical scheme that this example provides can make fluid step pressure reducing, prevent fluid from producing cavitation phenomenon when High Pressure Difference and equipment is caused damage, leave setting gap between spool and the corresponding valve seat in throttle sleeve simultaneously, one is avoid spool stuck by the solid particle in fluid, and two are easy for the dismounting of trim.

The determination regulating valve blood pressure lowering progression of the present embodiment.Such as, concrete working condition is: upstream pressure P₁=10.4MPa, downstream pressure P₂=2.5MPa, temperature 100 degree, WATER AS FLOW MEDIUM, flow 120 tons.First the judgement of pressure is carried out: pressure reduction P₁-P₂More than 0.5P₁, too big with one-level blood pressure lowering pressure reduction, it is necessary to adopt multilevel decompression.

The judgement of blood pressure lowering progression: P₁* 0.5=5.2MPa, 5.2MPa*0.5=2.6MPa, 2.6MPa are more than 2.5MPa, it should adopt three grades of blood pressure lowerings.

The determination of blood pressure lowering coefficient XT: afterbody blood pressure lowering should have the ability less than and close to 2.5MPa, therefore can select 2.45MPa.Owing to adopting three grades of blood pressure lowering 10.4MPa* (XT³)=2.45MPa, it is determined that XT=0.618, thus can confirm that the pressure drop of every grade, and the first order is reduced to 6.43MPa by 10.4MPa, and 3.92MPa is reduced to by 6.43MPa in the second level, and the third level is reduced to 2.45MPa by 3.92MPa.

Pressure is simply allowed to reduce due to every one-level but flow is constant, it is possible to calculate every one-level and accurately regulate the negotiability of spool, it is thus determined that the shape of spool and size.

The present invention is compared with prior art:

(1) mode of past employing hard alloy is inadvisable, should adopt the material of hardness and the better resistance to cavitation of toughness combination property, antiscour.

(2) seventies is frequently with arranging orifice plate Technology to reduce pressure drop on valve after valve, use this thinking can in valve handicapping power, reach good antihypertensive effect.

(3) prevent small guide vane from working, reduce the speed of wash fluid.

(4) select fluid application to change valve little as far as possible and reduce granule impact effect.

(5) flow disturbing can cause the serious erosion in local, and the method for dispersion flow-disturbing should be adopted to overcome.

(6) adopt multi-level throttle structure, improve valve service life by being divided into several less pressure drop by the pressure drop of valve.

(7) increase valve core diameter, improve spool rigidity, it is prevented that fracture.

(8) heavy caliber, big pressure reduction time, power piston formula actuator should be joined.

The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.

Claims (9)

1. three grades of punching spools regulate valve, it is characterized in that: include valve body, valve seat, throttle sleeve, valve gap and integrated spool and valve rod, described spool and described valve seat are arranged in described throttle sleeve, described spool bottom is connected with described valve seat, described valve rod is connected with described valve gap, described valve seat is provided with some valve seat orifice passed through for fluid, and described spool is provided with some spool bore passed through for fluid, and described valve seat, described spool and described throttle sleeve constitute fluid passage.

2. three grades of punching spools according to claim 1 regulate valve, it is characterised in that: in described fluid passage, the flow direction upper fluid of fluid flows through described valve seat, described spool and described throttle sleeve successively.

3. three grades of punching spools according to claim 2 regulate valve, it is characterised in that: the quantity of the valve seat orifice on described valve seat is identical with the quantity of the spool bore on described spool.

4. three grades of punching spools according to claim 3 regulate valve, it is characterised in that: the valve seat orifice size on described valve seat increases successively along the flow direction of fluid.

5. three grades of punching spools according to claim 1 regulate valve, it is characterised in that: described valve seat lower end is provided with noise reduction hole.

6. three grades of punching spools according to claim 1 regulate valve, it is characterised in that: it is provided with certain gap between described spool and described valve seat.

7. three grades of punching spools according to claim 1 regulate valve, it is characterised in that: the contact surface of described valve seat and described spool is sphere.

8. three grades of punching spools according to claim 7 regulate valve, it is characterised in that: for linear sealing between described valve seat and described spool.

9. three grades of punching spools according to any one of claim 1-8 regulate valve, it is characterised in that: the face contacted with described valve seat on described spool is provided with sealing surface；Or, the face that described valve seat contacts with described spool is provided with sealing surface；Or, on described spool and/or described valve seat be provided with sealing member.