CN102865378B

CN102865378B - Anti-scouring stop valve

Info

Publication number: CN102865378B
Application number: CN 201210381710
Authority: CN
Inventors: 吴振宇
Original assignee: NANTONG LONGYUAN POWER VALVE CO Ltd
Current assignee: NANTONG LONGYUAN POWER VALVE CO Ltd
Priority date: 2012-10-10
Filing date: 2012-10-10
Publication date: 2013-12-25
Anticipated expiration: 2032-10-10
Also published as: CN102865378A

Abstract

The invention relates to an anti-scouring stop valve. The anti-scouring stop valve is creatively characterized in that the stop valve is in a double-sealed structure; a valve seat is a step ring and is provided with an inner-ring sealing surface A and an outer-ring sealing surface A'; a valve clack is mounted at the lower end of a valve stem, and an outer-ring sealing surface B' which can be matched with the outer-ring sealing surface A of the valve seat is arranged at the lower end of the valve clack; and an inner spool which can vertically move along the axial direction of the stem valve is disposed in the valve clack, a reset spring allowing the inner spool to extend down to the lower end of the valve clack is sleeved on the inner spool, and an inner-ring sealing surface which can be matched with the inner-ring sealing surface A of the valve seat is arranged at the lower end of the inner spool. The anti-scouring stop valve has the advantages that the valve clack is used with valve seat to seal externally, the inner-ring sealing surface B of the inner spool is attached to the inner-ring sealing surface A of the valve seat through the reset spring to achieve internal sealing, and accordingly double sealing of the stop valve is achieved, sealing performance is increased, and operation reliability of the stop valve is increased greatly.

Description

A kind of scouring-proof stop valve

Technical field

The present invention relates to a kind of stop valve, particularly a kind of antileakaging scouring-proof stop valve.

Background technique

Power station valve also claims the power station special valve, mainly is applicable on the pipeline of the various systems of firepower power station, cuts off or connect the pipeline medium.Applicable media: the non-aggressive media such as water, steam.The characteristics that power station valve is compared with other valve products are High Temperature High Pressure.Current power station all adopts single sealing configuration with stop valve.

Because it works under high temperature and high pressure condition, in opening-closing process, sealing surface is subject to larger impact, cavitation erosion, is easy to occur leakage situation, and the power station pipe-line system is made a big impact.

Summary of the invention

The technical problem to be solved in the present invention is to provide a kind of antileakaging scouring-proof stop valve.For solving the problems of the technologies described above, technological scheme of the present invention is: a kind of scouring-proof stop valve, comprise valve body, valve seat, valve gap, valve rod and flap, the built-in valve seat of valve body, valve gap is arranged on the top of valve body, stem lower portion stretches into the inner chamber of valve body through the valve gap center, described stop valve adopts double sealing structure: valve seat is step-like annulus, and it has ring sealing surface A and an outer shroud sealing surface A ˊ in one; Flap is installed in the lower end of valve rod, and the flap lower end surface arranges the outer shroud sealing surface B ˊ that can coordinate with valve seat outer shroud sealing surface A ˊ; The built-in inner spool that can be vertical mobile along the valve rod axis direction of flap, be set with the Returnning spring that inner spool is stretched out to the flap lower end surface downwards on inner spool, on the inner spool lower end surface, arrange can with the interior ring sealing surface B that in valve seat, ring sealing surface A coordinates; The linkage structure of flap and valve rod and inner spool is: the lower end of valve rod arranges T-shaped end; Flap comprises flap and lower Disc, and upper flap and lower Disc are by welding or be threaded fixingly, and tapped hole is opened in the upper end of upper flap, and T-shaped end, the lower end of valve rod is locked in upper flap by externally threaded valve clack cover; Open the through hole that runs through upper and lower end face on lower Disc, the through hole middle part arranges the annular internal projection of radially protruding through-hole wall along through hole; Inner spool is stepped cylinder, and on it, small cylinder and lower large cylinder coaxially overlap formation, and lower cylindrical body is identical with the through-hole diameter of lower Disc, and upper cylindrical body is identical with the inner ring diameter of annular internal projection, and upper cylindrical body upper end arranges thread section; Be set with Returnning spring on the upper cylindrical body of inner spool, described cylindrical thread section is upward through from the through hole of lower Disc the throughhole portions that enters annular internal projection top annular internal projection inner ring, and be threaded with the inner spool stop nut, the external diameter of inner spool stop nut is greater than the inner ring diameter of annular internal projection and is less than through-hole diameter; The upper end of Returnning spring props up the lower end surface of annular internal projection, and the lower end of Returnning spring props up the step surface of small cylinder and the formation of lower large cylinder.

The invention has the advantages that: utilize flap to coordinate with valve seat and carry out external sealed, by Returnning spring, the interior ring sealing surface B of inner spool is close to the interior sealing of the upper realization of interior ring sealing surface A of valve seat simultaneously, and then realize the double seal of stop valve, improve sealability, greatly increased the functional reliability of stop valve.

The accompanying drawing explanation

Fig. 1 is scouring-proof stop valve structural representation of the present invention.

Fig. 2 is scouring-proof stop valve partial enlarged drawing of the present invention.

Embodiment

Valve in the present invention adopts double sealing structure:

As shown in Figure 1, comprise valve body 1, metallic shim A2, valve seat 3, current-sharing cover 4, inner spool 5, flap 6, Returnning spring 7, inner spool stop nut 8, metallic shim B9, valve rod 10, valve clack cover 11, valve gap 12, Packing seat 13, valve rod support 14, filler 15, Gland 16.

The interior installation valve seat 3 of above-mentioned valve body 1, valve seat 3 is step-like annulus, its sealing surface has ring sealing surface A and an outer shroud sealing surface A ˊ in one, between valve seat 3 and valve body supporting surface, metallic shim A2 is set.

Valve body 1 inner chamber also is equipped with current-sharing cover 4, current-sharing cover 4 is pressed on the upper-end surface of valve seat 3 by valve gap 12, valve gap 12 is arranged on the top of valve body 1 by bolt, nut, the lower end surface of valve gap 12 arranges the step surface that embeds valve body 1 inner chamber, between the step surface of valve gap 12 and valve body 1, metallic shim B9 is set.

Valve body 1 inner chamber is stretched into through valve gap 12 centers in valve rod 10 bottoms, and Packing seat 13 and filler 15 are set between valve rod 10 and valve gap 12, and filler 15 is pressed in valve gap 12 by Gland 16.Valve rod 10 tops are by the supporting of the bearing unit in valve rod support 14, and handwheel or electric driving mechanism can be installed in valve rod 10 upper ends.

Flap 6 is installed in the lower end of valve rod 10, and flap 6 lower end surfaces arrange the outer shroud sealing surface B ˊ 64 that can coordinate with valve seat 3 outer shroud sealing surface A; The built-in inner spool 5 that can vertically move a certain distance along valve rod 10 axial directions of flap 6, be set with the Returnning spring 7 that inner spool 5 is stretched out to flap 6 lower end surfaces downwards on inner spool 5, inner spool 5 lower end surfaces arrange the interior ring sealing surface B41 that can coordinate with the interior ring sealing surface of valve seat 3 A, and interior ring sealing surface B41 is inverted cone.

The linkage structure of flap and valve rod and inner spool is as shown in Figure 2:

Valve rod 10, the lower end of valve rod arranges T-shaped end;

Flap 6, comprise flap 61 and lower Disc 62, and upper flap 61 and lower Disc 62 are by welding or be threaded fixingly, and tapped blind hole is opened in the upper end of upper flap 61, and T-shaped end, the lower end of valve rod 10 is locked in upper flap 61 by externally threaded valve clack cover 11; Open the through hole that runs through upper and lower end face on lower Disc 62, the through hole middle part arranges the annular internal projection 63 of radially protruding through-hole wall along through hole;

Inner spool 5, inner spool 5 is stepped cylinder, and on it, small cylinder 51 and lower large cylinder 52 coaxially overlap formation, and lower cylindrical body 52 is identical with the through-hole diameter of lower Disc 62, upper cylindrical body 51 is identical with the inner ring diameter of annular internal projection 63, and upper cylindrical body 51 upper ends arrange thread section; Suit Returnning spring 7 on the upper cylindrical body 51 of inner spool 5, the thread section of upper cylindrical body 51 is upward through from the through hole of lower Disc 62 throughhole portions that enters annular internal projection 63 tops annular internal projection 63 inner rings, and be threaded with inner spool stop nut 8, the external diameter of inner spool stop nut 8 is greater than the inner ring diameter of annular internal projection 63 and is less than through-hole diameter; The upper end of Returnning spring 7 props up the lower end surface of annular internal projection 63, and the lower end of Returnning spring 7 props up the step surface of

small cylinder

51 and 52 formation of lower large cylinder.

Above-mentioned inner spool 5 and lower Disc 62 are after installation, lower Disc 62 and upper flap 61 are by welding or be threaded fixing, for improving stable connection, the lower end surface of upper flap 61 arranges cylindrical protrusions, and this cylindrical protrusions just can embed in the top through hole of lower Disc 62.

Working principle:

Under closed condition, flap 6 is under the effect of valve rod 10, inner spool 5 is under the effect of Returnning spring 7, and in it, ring sealing surface B41 is close to the interior sealing of interior ring sealing surface A realization of valve seat 3, and the outer shroud sealing surface A ˊ that its outer shroud sealing surface B ˊ 64 props up valve seat 3 realizes external sealed;

In the Open valve process, flap 6 moves up under the effect of valve rod 10, make the outer shroud sealing surface A ˊ of outer shroud sealing surface B ˊ 64 away from valve seat 3, now, inner spool 5 remains the trend of stretching out downwards under Returnning spring 7 effects, makes interior ring sealing surface B41 continue to be close to the interior ring sealing surface A of valve seat; Move on flap 6 continues, above move distance over after the extrusion of inner spool 5, the interior ring sealing surface B41 of inner spool 5 starts the interior ring sealing surface A away from valve seat 3, realizes the unlatching of valve;

In the throttle down process, flap 6 moves down under the effect of valve rod 10, inner spool 5, owing to stretching out flap 6 lower end surfaces under the effect at Returnning spring 7, makes the outer shroud sealing surface B64 contact valve seat 3 of the interior ring sealing surface 51 of inner spool 5 prior to flap 6, sealing in realizing; When flap 6 continues to move down, now, the interior ring sealing surface A that the interior ring sealing surface 51 of inner spool 5 continues to prop up valve seat 3 realizes double-sealing after the outer shroud sealing surface B64 of flap 6 props up the outer shroud sealing surface A of valve seat 3.

Claims

1. a scouring-proof stop valve, comprise valve body, valve seat, valve gap, valve rod and flap, the built-in valve seat of valve body, and valve gap is arranged on the top of valve body, and stem lower portion stretches into the inner chamber of valve body through the valve gap center, it is characterized in that:

Described stop valve adopts double sealing structure: valve seat is step-like annulus, and it has ring sealing surface A and an outer shroud sealing surface A ˊ in one; Flap is installed in the lower end of valve rod, and the flap lower end surface arranges the outer shroud sealing surface B ˊ that can coordinate with valve seat outer shroud sealing surface A ˊ; The built-in inner spool that can be vertical mobile along the valve rod axis direction of flap, be set with the Returnning spring that inner spool is stretched out to the flap lower end surface downwards on inner spool, on the inner spool lower end surface, arrange can with the interior ring sealing surface B that in valve seat, ring sealing surface A coordinates;

The linkage structure of flap and valve rod and inner spool is: the lower end of valve rod arranges T-shaped end; Flap comprises flap and lower Disc, and upper flap and lower Disc are by welding or be threaded fixingly, and tapped hole is opened in the upper end of upper flap, and T-shaped end, the lower end of valve rod is locked in upper flap by externally threaded valve clack cover; Open the through hole that runs through upper and lower end face on lower Disc, the through hole middle part arranges the annular internal projection of radially protruding through-hole wall along through hole; Inner spool is stepped cylinder, and on it, small cylinder and lower large cylinder coaxially overlap formation, and lower cylindrical body is identical with the through-hole diameter of lower Disc, and upper cylindrical body is identical with the inner ring diameter of annular internal projection, and upper cylindrical body upper end arranges thread section; Be set with Returnning spring on the upper cylindrical body of inner spool, described cylindrical thread section is upward through from the through hole of lower Disc the throughhole portions that enters annular internal projection top annular internal projection inner ring, and be threaded with the inner spool stop nut, the external diameter of inner spool stop nut is greater than the inner ring diameter of annular internal projection and is less than through-hole diameter; The upper end of Returnning spring props up the lower end surface of annular internal projection, and the lower end of Returnning spring props up the step surface of small cylinder and the formation of lower large cylinder.