CN201187611Y

CN201187611Y - Self-operated type pressure regulating valve

Info

Publication number: CN201187611Y
Application number: CNU200820063412XU
Authority: CN
Inventors: 明赐东
Original assignee: SICHUAN HUALIN AUTO-CONTROL EQUIPMENT Co Ltd
Current assignee: SICHUAN HUALIN AUTO-CONTROL EQUIPMENT Co Ltd
Priority date: 2008-05-08
Filing date: 2008-05-08
Publication date: 2009-01-28
Anticipated expiration: 2018-05-08

Abstract

The utility model discloses a self-force type pressure regulating valve which comprises a valve body, a valve core, a valve seat and a valve cover, wherein, the valve core and the valve seat are provided with sealing surfaces which mutually correspond, a compression spring is arranged at the root part of the valve core, the valve seat is provided with an upper and a lower sealing surfaces and a centre hole, and the centre hole is a straight hole with equal diameter or a conical hole; the valve core comprises an upper valve core and a lower valve core which are arranged in an opposite pushing way above and below the valve seat, and the flow regulating part of the upper valve core or the lower valve core presents a truncated cone or cylindrical shape and is positioned in the center hole of the valve seat; the compression spring of the upper valve core is provided with an initial length regulating mechanism; a damping element is arranged in the inlet channel of the valve body. The utility model has the advantages that the sensitivity and the pressure stabilization accuracy of the valve are high, the VI stage leakage can be realized, and the self-force type pressure regulating valve is particularly suitable for the operating condition with ultra small flow, such as Kv equal to or less than 0.003.

Description

Self-contained pressure regulator

Technical field

The utility model relates to modulating valve, relates in particular to a kind of self-contained pressure regulator, is particularly suitable for the regulating system of extra small flow.

Background technique

Need in the flow control system of steady pressure at some, usually adopt self-contained pressure regulator, the spool and the valve rod of this modulating valve are not rigidly connected, between spool and valve rod, set up spring, had pooling feature, when the system pressure behind the valve raises, act on the spool, valve opening reduces, and rate-of flow diminishes, and downstream pressure falls back to setting value; Otherwise when the system pressure behind the valve of valve reduced, under the spring force effect, valve opening increased, and the MEDIA FLOW quantitative change is big, and downstream pressure is returned high to setting value.This modulating valve, be used for conventional flow, conventional pressure reduction and the not high occasion of pressure controlled required precision, substantially can meet the demands, but, under system pressure vary within wide limits, extra small flow (such as Kv≤0.003), the demanding special operation condition of pressure controling precision, it is just not much of that to regulate sensitivity, can not satisfy pressure controlled required precision.

Summary of the invention

The purpose of this utility model, the self-contained pressure regulator that provides and a kind ofly be adapted at that pressure reduction changes arbitrarily, uses under the extra small flow operating mode, this modulating valve highly sensitive, pressure controling precision height.

Technical solution of the present utility model is:

A kind of self-contained pressure regulator comprises valve body, spool, valve seat, and described spool, valve seat have the sealing surface of mutual correspondence, and the root of described spool has pressure spring, and described valve seat has center hole, and this center hole is isometrical straight hole; Described spool comprises upper valve core and lower valve core, in opposite directions the top is arranged that the Flow-rate adjustment of described upper valve core or lower valve core partly is circular cone shape at the upper and lower of valve seat, and the microcephaly is last, and major part is positioned at the center hole of valve seat down.

The another kind of scheme of above-mentioned self-contained pressure regulator is, comprises valve body, spool, valve seat, and described spool, valve seat have the sealing surface of mutual correspondence, the root of described spool has pressure spring, and described valve seat has center hole, and this center hole is a conical bore, osculum is last, and big mouthful following; Described spool comprises upper valve core and lower valve core, in opposite directions the top is arranged that it is cylindric that the Flow-rate adjustment of described upper valve core or lower valve core partly is, and is positioned at the center hole of valve seat at the upper and lower of valve seat.

In above-mentioned two kinds of schemes:

The pressure spring of described upper valve core has the initial length controlling mechanism.

Described initial length controlling mechanism is constituted by pressing plate and screw mandrel, and described pressing plate cooperates with wire rod thread, or pressing plate is fixedlyed connected screw mandrel and valve gap screw-thread fit with screw mandrel.

The inlet passage of described valve body is provided with damping member.

Described damping member is an orifice plate.

Described orifice plate is a plural serial stage.

Described orifice plate is a porous slab.

Useful technique effect of the present utility model:

1. owing to adopt the dual spring double spool to roof construction, the sensitivity of valve event is very high, and under extra small flow such as Kv≤0.003 operating mode, the precision of voltage regulation is also very high.

Upper valve core and lower valve core all with the valve seat arranged concentric, be guiding with the valve seat, can realize that the VI level leaks, under extra small flow such as Kv≤0.003 operating mode still so that media implementation is effectively regulated.

3. the multistage damping orifice plate of the inlet channel of valve can effectively play the step-down of damming, the effect of noise reduction sound, anti-cavitation erosion, can reduce the high flow rate medium to the core print seat erosion of (promptly referring to the spool valve seat), cavitation erosion, the working life of improving valve, therefore, be specially adapted to the High Pressure Difference operating mode.

4. to the upper and lower spool of top formula, can effectively play the effect of damming at extra small flow operating mode lower valve core to medium, the concrete structure that changes the seal spool place can change its control characteristic, and is as equal percentage, linearity, open etc. soon, applied widely.

Description of drawings

Fig. 1 is the structural drawing of this self-contained pressure regulator

Fig. 2 is spool working state signal (being Local C among Fig. 1) figure among Fig. 1, wherein:

Fig. 2-the 1st, the position view when downstream pressure equals rated pressure behind the valve

Fig. 2-the 2nd, the position view when downstream pressure is higher than rated pressure behind the valve

Fig. 2-the 3rd, the position view when downstream pressure is lower than rated pressure behind the valve

Embodiment

Referring to Fig. 1: this self-contained pressure regulator comprises valve body 1, valve gap 12, upper valve core 2, valve seat 4.Wherein, the lower end surface of upper valve core 2 is sealed working faces, and is corresponding with the sealed working face of valve seat 4; The root of upper valve core 2 is piston bodies 9, is slidingly matched with valve body 1, and fitting surface is provided with seal ring 10.Be provided with pressure spring 5 in the valve gap 12, the lower end of pressure spring 5 is supported on the end face of piston body 9, there is the initial length regulating mechanism upper end of pressure spring 5, this mechanism is made up of pressing plate 11 and screw mandrel 8, there is screw to cooperate on the pressing plate 11 with screw mandrel 8, regulate screw mandrel 8, can adjust the initial length of spring 5, thereby set the voltage stabilizing value.Certainly, but also pressing plate 11 is fixedlyed connected with screw mandrel 8, screw mandrel 8 and valve gap 12 screw-thread fit.

More than be the basic structure of existing self-contained pressure regulator, the present invention has done following improvement on this basis: opened a hole in the bottom of valve body 1, inlayed the valve pocket 7 of a blind pipe shape in the hole, be furnished with pressure spring 6 and lower valve core 3 in the valve pocket 7, lower valve core 3 is supported on the spring 6.Like this, under the effect of upper spring 5, lower spring 6,

lower valve core

3,2 pairs of top contact of upper valve core.

The epimere of lower valve core 3 is circular cone shape, the microcephaly is last, and major part is the live part of Flow-rate adjustment down, be positioned at the center hole of valve seat 4, the center hole of valve seat 4 is isometrical straight holes, and the circular gap between circular cone 14 and the center hole is a medium runner, obviously, its actual internal area is relevant with the relative height of circular cone 14 in center hole, when the position of circular cone 14 was higher, actual internal area was less, otherwise then bigger.When circular cone was in highest order, the sealing surface of lower valve core 3 contacted with the lower sealing surface of valve seat 4, and medium runner is closed.

Certainly, circular cone 14 also can be located on the upper valve core 2, but must be positioned at the center hole of valve seat 4.

Also the center hole of valve seat 4 can be designed to conical bore, osculum is last, and big mouthful down, and the Flow-rate adjustment of upper valve core 2 or lower valve core 3 partly is cylindric, and its function is identical.

Change the concrete structure at seal spool place, adopt different runner-type lines, can change its control characteristic, as equal percentage, linearity, open etc. soon.

In addition, when being used for the High Pressure Difference occasion, can in the medium import A of valve body 1 runner, set up damping member 13,, alleviate damage spool, valve seat to reduce the inlet pressure of valve.Damping member 13 can adopt porous slab, for strengthening damping, can adopt the series connection of polylith porous slab, the classification step-down.

Working principle of the present utility model is as follows:

Referring to Fig. 2-1: when system is in normal working, when the pressure of valve export B equaled setting value, circular cone 14 was in a certain certain height position, and upper and

lower spring

5,6 is in state of equilibrium, and rate-of flow is constant;

Referring to Fig. 2-2: work as system fluctuation, when downstream pressure raises, act on the lower valve core 3, upper and

lower spring

5,6 disequilibriums are moved on the circular cone 14, and actual internal area diminishes, rate-of flow diminishes, and returns to setting value up to downstream pressure, upper and

lower spring

5,6 this moment balance once more.

Referring to Fig. 2-3: work as system fluctuation, when downstream pressure reduces, act on the lower valve core 3, upper and

lower spring

5,6 disequilibriums, circular cone 14 moves down, and it is big that actual internal area becomes, the MEDIA FLOW quantitative change is big, returns to setting value up to downstream pressure, upper and

lower spring

5,6 this moment balance once more.

Severe especially when system fluctuation, when downstream pressure is too high, move on to the limit on the circular cone 14, medium runner is closed, can guarantee safety.

Claims

1. a self-contained pressure regulator comprises valve body, spool, valve seat, valve gap, and described spool, valve seat have the sealing surface of mutual correspondence, and the root of described spool has pressure spring, it is characterized in that:

Described valve seat has center hole, and this center hole is isometrical straight hole; Described spool comprises upper valve core and lower valve core, in opposite directions the top is arranged that the Flow-rate adjustment of described upper valve core or lower valve core partly is circular cone shape at the upper and lower of valve seat, and the microcephaly is last, and major part is positioned at the center hole of valve seat down; Or

Described valve seat has center hole, and this center hole is a conical bore, and osculum is last, and big mouthful following; Described spool comprises upper valve core and lower valve core, in opposite directions the top is arranged that it is cylindric that the Flow-rate adjustment of described upper valve core or lower valve core partly is, and is positioned at the center hole of valve seat at the upper and lower of valve seat.

2. self-contained pressure regulator according to claim 1 is characterized in that: the pressure spring of described upper valve core has the initial length controlling mechanism.

3. self-contained pressure regulator according to claim 2 is characterized in that: described initial length controlling mechanism is constituted by pressing plate and screw mandrel, and described pressing plate cooperates with wire rod thread, or pressing plate is fixedlyed connected screw mandrel and valve gap screw-thread fit with screw mandrel.

4. self-contained pressure regulator according to claim 1 is characterized in that: the inlet passage of described valve body is provided with damping member.

5. self-contained pressure regulator according to claim 4 is characterized in that: described damping member is an orifice plate.

6. self-contained pressure regulator according to claim 5 is characterized in that: described orifice plate plural serial stage.

7. according to claim 5 or 6 described self-contained pressure regulators, it is characterized in that: described orifice plate is a porous slab.