CN203374960U

CN203374960U - Flow control valve

Info

Publication number: CN203374960U
Application number: CN201320470697.XU
Authority: CN
Inventors: 杨志聪
Original assignee: SHANGHAI YAHE VALVE COMPLETION Co Ltd
Current assignee: SHANGHAI YAHE VALVE COMPLETION Co Ltd
Priority date: 2013-07-24
Filing date: 2013-07-24
Publication date: 2014-01-01
Anticipated expiration: 2023-07-24

Abstract

The utility model discloses a flow control valve which comprises a valve body, a valve rod placed inside the valve body and a matched valve cover fixed on the valve body. The flow control valve is characterized in that a valve seat is arranged between an inlet channel and an outlet channel through which liquid flows, an annular groove in the periphery of the valve seat is provided with a throttle sleeve, the upper end portion of the throttle sleeve is tightly attached to the inner surface of the valve body, the lower end, placed inside the valve body, of the valve rod is provided with a valve element, a protruding loop is arranged on the valve element, and the upper end face of the protruding loop is provided with a soft sealing ring fixed through a sealing ring. According to the flow control valve, leakage flow is effectively reduced through the metal sleeve, the hard valve element and the soft structure, the adjustable ratio is greatly increased, the working requirement for small flow can be met, and the single-level or multi-level sleeve has the advantages of preventing erosion, lowering nose and resisting flushing.

Description

Flow control valve

Technical field

The utility model relates to a kind of valve, particularly flow control valve.

Background technique

There are two key technology difficult points in flow control valve:

Pressure reduction is larger after and before the valve, and pressure reduction commonly used is between 1～20Mpa.Under the High Pressure Difference operating mode, fluid can produce cavitation and wash away and wait damage trim in valve, makes the sealing surface of valve lose closing function, causes the leakage current amount excessive, will affect Benefit of Unit, causes energy consumption to waste.

In the small flow regulating system, the flow resistance of system is very large on the impact of flow control valve Flow characteristics, often makes flow control valve Flow characteristics distorted.Adopt common telescoping valve even single-seat valve control fluid, just can not carry out the small flow adjusting.When valve is opened a little, more than flow may reach 3T/h, even larger, and in fact, it is adjustable that the cooling water minimum discharge need to be controlled at the 0.5T/h left and right, even smaller.And peak rate of flow should reach between 5～100T/h according to the difference of application.

Produce the flow control valve meeted the requirements, must solve above-mentioned two large difficult points, design a kind of rationally effective structure, can prevent cavitation and wash away damage again the working flow characteristic that conforms with usage requirement to be arranged.

This modulating valve of this operating mode generally adopts ordinary cartridge or single seat structure at present, and due to the restriction of processing and assembling aspect, flap and sleeve gap can not be too little, too the little Yi calorie is dead in gap, open in gap too large is that flow is very large, can't be finely tuned, and does not reach the needs of operating mode practical adjustments.

The model utility content

The purpose of this utility model is that a kind of flow control valve of regulating at tiny flow quantity is provided in order to solve above-mentioned the deficiencies in the prior art.

To achieve these goals, the flow control valve that the utility model is designed, comprise valve body, be placed in the interior valve rod of valve body, be fixed on the valve gap that the valve body upper end coordinates, it is characterized in that: between the access way of valve body circulation, be provided with valve seat, the peripheral annular groove of valve seat is provided with throttle sleeve, and valve interior surface is close in the throttle sleeve upper end portion, and the lower end that valve rod is placed in valve body is equipped with spool, spool is provided with bulge loop, and the bulge loop upper-end surface is provided with by seal ring the fixing soft seal circle of cap.

Preferably, described throttle sleeve is the single-stage throttle sleeve.

Preferably, described throttle sleeve is the multistage throttle sleeve.

Preferably, described throttle sleeve is that metallic material is made.

The flow control valve that the utility model obtains, adopt metal sleeve, hard spool and soft structure to effectively reduce leakage current, and regulating ratio significantly increases, and can meet the small flow job requirement, and single-stage or multi-stage sleeve have good cavitation-preventive, noise-reducing, the characteristics of resistance to erosion.

The accompanying drawing explanation

Fig. 1 is overall structure schematic diagram of the present utility model;

Fig. 2 is the structural representation of sleeve;

Fig. 3 is that the throttling of multi-stage sleeve flows to schematic diagram.

In figure: valve body 1, valve rod 2, spool 3, valve gap 4, throttle sleeve 6, soft seal circle 10, seal ring cap 11, pad 20, valve seat 21, bulge loop 31.

Embodiment

Below in conjunction with drawings and Examples, the utility model is further illustrated.

Embodiment:

As shown in Figure 1 to Figure 3, the flow control valve that the utility model provides, comprise valve body 1, be placed in the valve rod 2 in valve body, be fixed on the valve gap 4 that the valve body upper end coordinates, be provided with valve seat 21 between the access way of valve body circulation, valve seat 21 also is equipped with pad 20 between on valve body, the peripheral annular groove of valve seat is provided with throttle sleeve 6, described throttle sleeve 6 is made for metallic material, valve interior surface is close in throttle sleeve 6 upper end portions, the lower end that valve rod 2 is placed in valve body is equipped with spool 3, spool is provided with bulge loop 31, the bulge loop upper-end surface is provided with by seal ring the fixing soft seal circle 10 of cap 11, because soft seal circle 10 structures have mobility, can be well that sleeve 6 and spool 3 gap control are good, the leakage current amount is greatly lower, even can reach the zero leakage requirement, regulating ratio increases greatly, can meet the usage requirement of small flow fully.

Preferably, can to adopt single-stage throttle sleeve, described throttle sleeve be the single-stage throttle sleeve to described throttle sleeve 6.

The single-stage sleeve: when the mobile medium of multiple directions is pooled to " heart section " of valve seat or spool with same speed, the power consumption effect that liquidates of generation, terminated and continued the jet pipe effect of step-down speedup, and rate of flow of fluid is reduced, and kinetic energy changes potential energy into.Make fluid not reach the lower limit of vapor pressure, eliminated the flash conditions of saturation state working medium.At valve seat, valve core inside, do not have the gasification of fluid to occur, therefore can not cause cavitation erosion to flow passage components.

Multistage throttle: the circulation opposite flushing type tube-in-tube structure, owing to having adopted multilevel decompression and the fluid motion principle that liquidates, effectively overcome cavitation phenomenons, extended the life-span of valve.

Claims

1. a flow control valve, comprise valve body, be placed in the interior valve rod of valve body, be fixed on the valve gap that the valve body upper end coordinates, it is characterized in that: between the access way of valve body circulation, be provided with valve seat, the peripheral annular groove of valve seat is provided with throttle sleeve, valve interior surface is close in the throttle sleeve upper end portion, the lower end that valve rod is placed in valve body is equipped with spool, and spool is provided with bulge loop, and the bulge loop upper-end surface is provided with by seal ring the fixing soft seal circle of cap.

2. flow control valve according to claim 1, it is characterized in that: described throttle sleeve is the single-stage throttle sleeve.

3. flow control valve according to claim 1, it is characterized in that: described throttle sleeve is the multistage throttle sleeve.

4. according to claim 1 or 2 or 3 described flow control valves, it is characterized in that: described throttle sleeve is that metallic material is made.