CN200982425Y

CN200982425Y - High temperature high pressure flushing-resistant high pressure difference regulating valve

Info

Publication number: CN200982425Y
Application number: CN 200620166533
Authority: CN
Inventors: 冯光
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-12-07
Filing date: 2006-12-07
Publication date: 2007-11-28
Anticipated expiration: 2016-12-07

Abstract

The utility model discloses a high-temperature high-pressure anti-erosion high differential pressure regulating valve and comprises a valve body, a valve seat, a flap, a valve cage, a valve stem, a support bracket, a valve stem nut and a handwheel. Wherein the valve seat is movable and is capable of being taken out of the valve body to be processed. The hardness and the accuracy are to be controlled strictly and the sealing performance and the anti-erosion performance of the sealing surface of the valve seat are largely enhanced. After dielectrics enter inside a valve cavity, the valve cage lowers the pressure of the dielectrics and lowers the flow velocity of the dielectrics. The erosion to the flap and the valve seat caused by the dielectrics is largely reduced. The working life of the sealing surface of the valve is largely increased. Because a guidance function on the valve stem and the flap on the lower end of the valve stem is performed by the valve cage when the valve is started and stopped, the returning rate is increased from the 80% specified by GB to the 100%. When the valve stem is started and stopped, under the influence of a guide plate and the valve stem nut, the movement is only to be an up-and-down lifting movement but not a rotation movement. Thereby the abrasion to the filling is reduced with enhancing the working life of the valve.

Description

The anti-high-differential-pressure regulating valve that washes away of High Temperature High Pressure

Technical field

The utility model relates to hydrophobic, the blowdown modulating valve of big pressure reduction on a kind of being installed on the process pipeline, particularly high-temperature high-pressure medium pipeline.

Background technique

In Thermal Power Station, chemical industry is in large-sized boilers such as pharmacy, the various high parameter petrochemical equipment process pipeline system.Employed hydrophobic, drainage device requires can bear cavitation under big differential pressure conditions and wash away, and sealing requirements is very high, opens number of times and calculates by 5 times every day, will satisfy an overhaul life (4 years) at least.And existing as " the special-purpose handbook of industrial valve (China Machine Press, publish May nineteen ninety-five), shown in stop valve, valve sealing face is directly built-up welding on valve body, because mesopore is very dark, operator are difficult to control the slag inclusion of face of weld, pore, and can't check, valve import and export two ends pressure reduction reaches more than the 14Mpa in addition, and the cavitation phenomenons that valve internal produces produces valve and seriously washes away, leak in very easily producing, general when medium temperature greater than 200 ℃, working pressure is during greater than 10Mpa, only uses to leak in just producing in 3 months, cause energy waste, bring adverse effect also for normal safety in production.

Summary of the invention

The purpose of this utility model is to be to provide a kind of high-differential-pressure regulating valve, overcome the defective that exists in the above-mentioned prior art, make hydrophobic, drainage device have the significantly anti-function of washing away, under high-temperature and high-pressure conditions, open and close repeatedly, still keep excellent sealing performance, and improve working life greatly.

The purpose of this utility model realizes in the following way: the anti-high-differential-pressure regulating valve that washes away of a kind of High Temperature High Pressure, it comprises: valve body 1, valve seat 3, flap 4, valve cage 6, valve rod 7, filler 12, divided ring 13, gland 14, spring 15, pressing plate 16, guide plate 17, support 23, bearing 24, Stem Mut 25, handwheel 30.It is characterized in that described valve seat 3 is movable, can be held in the processing of valve body 1 outside, be placed in the valve body 1 after valve seat 3 processing again, described valve cage 6 places on the valve seat 3, within the valve body 1; Described valve rod 7 places among the valve cage 6, and the lower end connects flap 4, and the upper end connects handwheel 30, and described support 23 built-in Stem Muts 25 and bearing 24 made Stem Mut 25 and support 30 that valve rod 7 is moved up and down.In such scheme, because valve seat 3 is movable, can takes out outside the valve body 1 and process, crackle and the slag inclusion of having avoided the deep hole welding easily to produce, its hardness and precision are able to strict control, have improved the sealability and the anti-erosion property of sealing surface of seat greatly; Valve cage 6 in medium enters valve pocket after, pressure medium is reduced, velocity of medium is reduced, alleviated the erosion of medium greatly to flap 4 and valve seat 3, thus the working life of greatly having improved valve sealing face; Because the flap 4 of valve rod 7 and its lower end is done leading role by valve cage when valve opening and closing, so its time seat rate is brought up to absolutely by 80 percent of GB regulation.Valve rod 7 under the effect of guide plate 17 and Stem Mut 25, is only done oscilaltion and is not rotated when opening and closing, thereby has alleviated the wearing and tearing to filler 12, has had the well anti-performance that leaks outside, thus the working life of having improved valve.

Owing to taked such scheme, particularly adopted the hypotensive effect of valve cage 6, not only make valve rod 7 have leading role, produced the seat rate hundred-percent time, and play automatic hypotensive effect, make that this modulating valve not only opens and closes freely but also overall sealing performance remains at good state under high-temperature high-pressure state.

Description of drawings

Fig. 1 is overall structure figure of the present utility model.

Among the figure; The 1-valve body; The 2-spirotallic gasket; The 3-valve seat; The 4-flap; The 5-elastic cylindrical pin; The 6-valve cage; The 7-valve rod; The 8-Packing seat; 9,10-straight pin; 11-tightening double-screw bolt; The 12-filler; 13-splits annulus; The 14-gland; 15-butterfly spring; The 16-pressing plate; 17,18-guide plate; The 19-hex head bolt; The 20-pad; 21 thick hexagonnuts; The 22-swing bolt; The 23-support; The 24-bearing; The 25-Stem Mut; The 26-bearing gland; The 27-Cock screw; The 28-key; The 29-circlip; The 30-handwheel; The 34-grommet.

Embodiment

By Fig. 1: it comprises valve body 1 the utility model, valve seat 3, valve cage 6, valve rod 7, guide plate 17, support 23, Stem Mut 25, bearing 24, handwheel 30 is characterized in that described valve seat 3 is movable, can outside valve body, process, be placed in the valve body 1 after valve seat 3 processing, described valve cage 6 places on the valve seat 3, within the valve body 1 again, described valve rod 7 places among the valve cage 6, the lower end connects flap 4, and the upper end connects handwheel 30, and described support 23 built-in Stem Muts 25 and bearing 24 also move up and down valve rod 7 by Stem Mut 25 and support 30.When valve opening, rotation hand wheel 30, bearing 24 rotates, and valve rod 7 is under the effect of guide plate 17, move upward with form without spin, lift off a seat 3 thereby drive flap 4, medium flows to the other end from an end, in the media flow process, valve cage plays decompression, slowed down medium to the washing away of valve seat and flap, and flap is because processing outside, quality has been subjected to better controlled, so valve still can keep excellent sealing performance under the long-time running state.The counterrotating handwheel, valve rod 7 drives flap 4 and presses to valve seat 3, because valve is not just washed away when opening, the leading role of 6 pairs of flaps 4 of valve cage in addition, make flap absolutely get back to original position, so behind the valve closing, valve still is in good sealing state.

The utility model sealing surface of seat is placed in the valve body behind the built-up welding cobalt base alloy outside valve body, valve cage places the valve body lumen, valve rod cooperates, has carried out vertically motion without spin by support, Stem Mut, guide plate, bearing, have good high temperature high voltage resistant erosion, wear-resisting property, therefore the anti-high-differential-pressure regulating valve sealing of washing away of the utility model High Temperature High Pressure is good, long service life.

Claims

1. anti-high-differential-pressure regulating valve that washes away of High Temperature High Pressure, it comprises valve body (1), valve cage (6), flap (4), valve rod (7), support (23), bearing (24), Stem Mut (25), guide plate (17,18), gland (14), spring (15), pressing plate (16), filler (12), handwheel (30), it is characterized in that, the sealing surface of valve seat (3) no longer is built-up welding on the base material of valve body (1), but outside valve body, be placed on again in the valve body (1) after the built-up welding processing, described valve cage (6) places the inner chamber of valve body (1), upward link to each other, link to each other with valve seat (3) down with filler (12); Described valve rod (7) places among the valve cage (6), and the lower end connects flap (4), and the upper end connects handwheel (30); Built-in Stem Mut of described support (23) (25) and bearing (24), described spring (15) is passed from the centre by valve rod (7), on connect and connect gland (14) under the pressing plate (16).

2. the anti-high-differential-pressure regulating valve that washes away of High Temperature High Pressure according to claim 1 is characterized in that, the surface overlaying cemented carbide of movable valve seat (4) is again through fine finishing and grind to form the sealing pair of valve seat (4).

3. the anti-high-differential-pressure regulating valve that washes away of High Temperature High Pressure according to claim 1, it is characterized in that, place the valve cage (6) of valve body (1) inner chamber to be shaped as hollow Cylinder, around the Cylinder according to the different temperature and pressure values of medium, be processed with the through hole of difformity, size and quantity, and handle through surface hardening.

4. the anti-high-differential-pressure regulating valve that washes away of High Temperature High Pressure according to claim 1 is characterized in that, built-in Stem Mut of support (23) (25) and bearing (24), and bearing (24) and Stem Mut (25) place in the groove at support (23) top.

5. the anti-high-differential-pressure regulating valve that washes away of High Temperature High Pressure according to claim 1 is characterized in that, therefrom passed by valve rod (7), on connect the spring (15) that connects gland (14) under the pressing plate (16), it is shaped as butterfly or spiral.