CN202001646U

CN202001646U - Cage type regulating valve with single seat

Info

Publication number: CN202001646U
Application number: CN2011200207530U
Authority: CN
Inventors: 蒋建荣; 何生平; 王郑飞
Original assignee: HANGZHOU JIANENG VALVES CO Ltd
Current assignee: HANGZHOU JIANENG VALVES CO Ltd
Priority date: 2011-01-21
Filing date: 2011-01-21
Publication date: 2011-10-05
Anticipated expiration: 2021-01-21

Abstract

A cage type regulating valve with a single seat is used for regulating and stopping control in places with higher front and back pressure differences and higher requirements on leakage level. The cage type regulating valve comprises a valve body provided with an inlet and an outlet, and a valve bonnet is fixedly mounted on the upper portion of the valve body. The cage type regulating valve is mainly technically characterized in that a lower sleeve is disposed in a space formed between the valve bonnet and the valve body, an upper sleeve is connected to the upper portion of the lower sleeve, a U-shaped sealing ring is mounted between the upper sleeve and the lower sleeve, a valve spool is mounted in the upper sleeve and the lower sleeve and fixedly connected to the lower end of a valve stem, the upper end of the valve stem extends out of the valve bonnet to be connected with an output shaft of an executing mechanism, and the U-shaped sealing ring is further connected with a metal tension spring. The cage type regulating valve guarantees that the valve spool is constantly in dynamic balance of pressure, and the valve spool and a valve seat are structures with single sealing surfaces so that leakage level of the integral regulating valve can reach the VI level.

Description

Cage type single seat regulating valve

Technical field:

The utility model relates to and a kind ofly is used for pressure reduction occasion big, that leakage class is had relatively high expectations before and after the modulating valve and regulates modulating valve with closing control.

Background technique:

Common cage type regulating valve adopts the double-sealing face structural design, leakage rate is bigger, can't satisfy to leak the operating mode of having relatively high expectations, and cage type single seat regulating valve in the market then adopts groove crack formula or piston ring seal, all have the gap, can't realize the high-leakage class requirement when closing.

Summary of the invention:

The utility model provides a kind of existing higher leakage class of valve that guaranteed that the cage type single seat regulating valve of good high pressure resistant poor performance is arranged again.

The utility model is achieved by the following technical solution: a kind of cage type single seat regulating valve, comprise valve body with import and outlet, valve body top is installed with a valve gap, its major technique feature is in the space that forms between valve gap and the valve body, be provided with lower sleeve, connect a upper bush on lower sleeve top, on, the U-shaped seal ring is installed between lower sleeve, last, a spool is installed in the lower sleeve, spool is fixedly connected on the lower end of valve rod, valve rod upper end is stretched out valve gap and is connected with actuator shaft, and with the action of actuator, valve rod drive spool is done in sleeve and moved up and down;

Described U-shaped seal ring also has a metal tension spring to link to each other.

The utility model has adopted the U-shaped seal ring to carry out pressure balance, valve core outer surface is through cemented carbide spraying, mill and polishing treatment, the pretightening force of added metal tension spring and the pressure of medium continuingly act on the seal lip, guaranteed that spool is in pressure transient equiliblium all the time, spool and valve seat use single sealing surface structure, make whole modulating valve leakage class can reach the VI level.

Description of drawings:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the A place enlarged view of Fig. 1;

Fig. 3, Fig. 4 are valve open and the pressure state figure that closes.

Embodiment:

Among the figure, 1-valve body, 2-valve seat insert, 3-lower sleeve, the 4-spool, 5-upper bush, 6-U shape seal ring, flange seal circle among the 7-, the 8-valve gap, 9-stud, 10-flat gasket, 11-nut, the 12-spring, 13-Packing seat, filler under the 14-, filler among the 15-, the last filler of 16-, 17-lining, the 18-screw, 19-valve rod, 20-metal tension spring.

As shown in Figure 1, this cage type single seat regulating valve, comprise valve body 1 with import and outlet, valve body top is installed with a valve gap 8, in the space that forms between valve gap and the valve body, be provided with lower sleeve 3, connect a upper bush 5 on lower sleeve top, U-shaped seal ring 6 is installed between upper and lower sleeve, a spool 4 is installed in upper and lower sleeve, and spool is fixedly connected on the lower end of valve rod 19, and the valve rod upper end is stretched out valve gap and is connected with actuator shaft, and with the action of actuator, valve rod drives spool and does in sleeve and move up and down.As shown in Figure 2, U-shaped seal ring 6 also links to each other with a metal tension spring 20.

As shown in Figure 3, Figure 4, when valve open is regulated, pressure medium can produce a thrust that makes progress in the spool lower end, medium enters the spool epicoele through the spool pod apertures simultaneously, produce a downward thrust in the spool upper end, because spool upper and lower end area is basic identical, so spool is in the pressure dynamic balance state all the time.When closing, lower sleeve sealing surface and U-shaped seal ring seal simultaneously, medium is cut off fully, thereby reach higher leakage class, in addition since both diameters much at one, do not have area difference, therefore supreme unbalanced force has down guaranteed that the existing higher leakage class of valve has good high pressure resistant poor performance again.

Claims

1. cage type single seat regulating valve, comprise valve body with import and outlet, valve body top is installed with a valve gap, in the space that it is characterized in that forming between valve gap and the valve body, be provided with lower sleeve, connect a upper bush on lower sleeve top, the U-shaped seal ring is installed between upper and lower sleeve, a spool is installed in upper and lower sleeve, spool is fixedly connected on the lower end of valve rod, valve rod upper end is stretched out valve gap and is connected with actuator shaft, and with the action of actuator, valve rod drive spool is done in sleeve and moved up and down.

2. a kind of cage type single seat regulating valve as claimed in claim 1 is characterized in that described U-shaped seal ring also has a metal tension spring to link to each other.