CN102865378A

CN102865378A - Anti-scouring stop valve

Info

Publication number: CN102865378A
Application number: CN2012103817104A
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: 2013-01-09
Anticipated expiration: 2032-10-10
Also published as: CN102865378B

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.Single sealing configuration is all adopted with stop valve in present power station.

Because it is worked 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 provides 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 installed in the top of valve body, stem lower portion is passed the inner chamber that valve body is stretched at the valve gap center, and its innovative point is: 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 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 that can cooperate with valve seat outer shroud sealing surface A; The built-in inner spool that can move along the valve rod axis perpendicular direction of flap is set with the Returnning spring that inner spool is stretched out the flap lower end surface downwards on the inner spool, the interior ring sealing surface B that can cooperate with ring sealing surface A in the valve seat is set on the inner spool lower end surface; 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 blind hole is opened in the upper end of upper flap, and T-shaped end, the lower end of valve rod is locked in the upper flap by externally threaded valve clack cover; Open the through hole that runs through the upper and lower end face on the 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, small cylinder and the coaxial formation that overlaps of lower large cylinder on it, 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 the throughhole portions that enters annular internal projection top behind the annular internal projection inner ring from the through hole of lower Disc, 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 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 cooperate with valve seat and carry out external sealed, by Returnning spring the interior ring sealing surface B of inner spool is close to simultaneously the interior sealing of the upper realization of interior ring sealing surface A of valve seat, and then the double seal of realization stop valve, improve sealability, greatly increased the functional reliability of stop valve.

Description of drawings

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 among the present invention adopts double sealing structure:

As shown in Figure 1, comprise valve body 1, metallic shim 2, valve seat 3, current-sharing cover 4, inner spool 5, flap 6, Returnning spring 7, inner spool stop nut 8, metallic shim 9, valve rod 10, valve clack cover 11, valve gap 12, Packing seat 13, valve rod support 14, filler 15, Gland 16.

Above-mentioned valve body 1 interior installation valve seat 3, valve seat 3 is step-like annulus, its sealing surface has ring sealing surface A and an outer shroud sealing surface A in one, between valve seat 3 and the valve body supporting surface metallic shim 2 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 installed in 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 9 is set.

Valve rod 10 bottoms are passed valve gap 12 centers and are stretched into valve body 1 inner chamber, and Packing seat 13 and filler 15 are set between valve rod 10 and the valve gap 12, and filler 15 is pressed in the valve gap 12 by Gland 16.Valve rod 10 tops are by the supporting of the bearing unit in the 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 B64 that can cooperate 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 flap 6 lower end surfaces downwards on the inner spool 5, inner spool 5 lower end surfaces arrange the interior ring sealing surface B51 that can cooperate with valve seat 3 interior ring sealing surface A, and interior ring sealing surface B51 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 comprises 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 the upper flap 61 by externally threaded valve clack cover 11; Open the through hole that runs through the upper and lower end face on the 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, small cylinder 51 and the lower large cylinder 52 coaxial formations that overlap on it, 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 the throughhole portions that enters annular internal projection 63 tops behind annular internal projection 63 inner rings from the through hole of lower Disc 62, 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 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 the closed condition, flap 6 is under the effect of valve rod 10, and inner spool 5 is under the effect of Returnning spring 7, and ring sealing surface B51 is close to the interior sealing of interior ring sealing surface A realization of valve seat 3 in it, and the outer shroud sealing surface A that its outer shroud sealing surface B64 props up valve seat 3 realizes external sealed;

In the Open valve process, flap 6 moves up under the effect of valve rod 10, so that outer shroud sealing surface B64 is away from the outer shroud sealing surface A of valve seat 3, at this moment, inner spool 5 remains the trend of stretching out downwards under Returnning spring 7 effects, so that interior ring sealing surface B51 continues to be close to the interior ring sealing surface A of valve seat; On flap 6 continues, move, on move after distance surpasses the extrusion of inner spool 5, interior ring sealing surface 51 beginnings of inner spool 5 realize the unlatching of valve away from the interior ring sealing surface A of valve seat 3;

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

Claims

1. a scouring-proof stop valve comprises valve body, valve seat, valve gap, valve rod and flap, the built-in valve seat of valve body, and valve gap is installed in the top of valve body, and stem lower portion is passed the inner chamber that valve body is stretched at 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 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 that can cooperate with valve seat outer shroud sealing surface A; The built-in inner spool that can move along the valve rod axis perpendicular direction of flap is set with the Returnning spring that inner spool is stretched out the flap lower end surface downwards on the inner spool, the interior ring sealing surface B that can cooperate with ring sealing surface A in the valve seat is set on the inner spool lower end surface;

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 the upper flap by externally threaded valve clack cover; Open the through hole that runs through the upper and lower end face on the 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, small cylinder and the coaxial formation that overlaps of lower large cylinder on it, 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 the throughhole portions that enters annular internal projection top behind the annular internal projection inner ring from the through hole of lower Disc, 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 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.