CN2292190Y

CN2292190Y - Flushing-resistant high-pressure throttle stop valve

Info

Publication number: CN2292190Y
Application number: CN 97207422
Authority: CN
Inventors: 米力田; 黄汝桥
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-01-06
Filing date: 1997-01-06
Publication date: 1998-09-23
Anticipated expiration: 2007-01-06

Abstract

The utility model provides a flushing-resistant high-pressure throttle stop valve, which is composed of a valve body, a valve seat, a valve clack, and an opening and closing mechanism. The valve body comprises an upper valve body and a short segment with a flange, and the short segment is matched with the upper valve body; the valve clack comprises a valve clack body connected with the opening and closing mechanism, a valve clack guide head provided with a flow guiding slot, and a ceramic valve clack ring positioned between the matching surfaces of the valve clack body and the valve clack guide head; the opening and closing mechanism and the valve clack body are in threaded connection; the valve seat comprises a valve seat body and a ceramic valve seat ring, and the valve seat body and the ceramic valve seat ring are compressed on the valve body via the short segment. The structure improves the sealing performance and the of the flushing-resistant ability of flushing-resistant high-pressure throttle stop valve, and the utility model is suitable for being used as a throttle valve, a stop valve, a blow-off valve, an emptying valve, etc. for the oilfield industry, the natural gas industry, the chemical industry, etc.

Description

The anti-High-pressure Throttle Stop Valve that washes away

The utility model relates to a kind of valve, particularly relates to a kind of anti-High-pressure Throttle Stop Valve that washes away.

At present, employed throttling stop valve all is needle value basically in oil, the gas industry, and when valve was in the high pressure throttle, high-velocity fluid directly washed away sealing surface, makes the very fast inefficacy of valve.Also there are some valves to adopt the method that changes sealing surface shape or material to improve its anti-scouring capability in recent years, but the sealing surface of these stop valves remains throttling element, when valve was in the high pressure throttle, its sealing surface still can be subjected to high-velocity fluid and wash away indirectly or directly, weares and teares.Therefore these stop valves can not use under throttle for a long time.Chinese patent CN2032669 has introduced a kind of anti-abrasion high-pressure stop valve, it is to inlay a metal pipe nipple as valve seat in the inlet channel hole, this metal pipe nipple one end and German-style metal lensring are weldingly connected, the other end is the plane of band convex seam, the sealing surface of spool is the plane of indent, and this kind stop valve still can not be avoided the fluid scouring sealing surface.

The purpose of this utility model is to provide a kind of its sealing position to separate with the throttling position, and fluid does not directly wash away the anti-High-pressure Throttle Stop Valve that washes away of sealing surface.

The utility model is anti-to be washed away High-pressure Throttle Stop Valve and is achieved in that it is made up of valve body, valve seat, flap and switching mechanism, valve body comprise upper valve body, with upper valve body screw-thread fit and flanged (FLGD) pipe nipple; Flap comprises the valve petal body that is connected with switching mechanism, is threaded with valve petal body, have on it guiding gutter the flap guide head, be positioned at the ceramic flap ring between valve petal body and flap guide head fitting surface; Valve seat comprises valve body and ceramic valve seat ring, and the two is pressed on the upper valve body by pipe nipple; Switching mechanism comprises the support with the upper valve body screw-thread fit, is arranged on the valve rod that is connected with valve petal body in the support, the stuffing box packing between valve rod and upper valve body with the filler pressure cap, be connected the Stem Mut of valve rod and support, and be loaded on the handle on the valve rod.For throttling and sealing better, its upper end of the guiding gutter width on the flap guide head and the degree of depth is greater than the lower end, and on the surface of contact of valve petal body and flap ceramic ring and flap guide head, on the surface of contact of flap seat and ceramic flap ring, be equipped with Sealing on ceramic valve seat ring and the valve body surface of contact and on the surface of contact of valve body and upper valve body, especially mutually be embedded in the soft seal ring of valve petal body lower end and ceramic flap interannular, be sealed and matched firmly with pottery, further improved the sealability and the abrasion resistance energy of valve, the shape of soft seal ring can be the O type, rectangle, trapezoidal or tongue type etc.

The anti-working principle of washing away High-pressure Throttle Stop Valve of the utility model is, rotatable handle, during valve opening, flap upwards moves in ceramic valve seat ring inner cylindrical surface, the end face seal position of flap and ceramic valve seat ring is separated from, micro fluid is extruded from flap and valve seat fitting surface gap, realizes the high pressure throttling; When the guiding gutter position of valve opening to the flap guide head, fluid carries out big flow throttling by guiding gutter, because the equal upper end of the width of guiding gutter and the degree of depth is greater than the lower end, so flap moves up highly more, valve opening degree is also big more, and is also big more by the flow of valve; When valve closing, flap moves down, valve opening degree reduces thereupon, and convection cell carries out throttling, after flap moves past guiding gutter, micro fluid is extruded from flap and valve seat gap, convection cell carries out the high pressure throttling, at this moment, has only micro-media flow between flap end face and valve seat end face area, its flowing velocity is low, washes away less to the sealing position; When the flap end face with after the valve seat end face contacts fully, then block fluid fully, valve closing, at this moment, soft seal ring further on shutoff flap and the sealing surface of seat owing to install and micro-gap that processing causes, realize sealing fully.Specific pressure on the valve sealing face acts on the fluid medium pressure on the flap in addition except that valve rod is closed power, increased the valve seal reliability.The sealing position separates with the throttling position, makes sealing surface not washed away by high-velocity fluid, has protected the valve seal pair, simultaneously, because the high abrasion ceramic ring has been adopted at sealing position and throttling position, has further improved the anti-scouring capability of valve.

The anti-advantage of washing away High-pressure Throttle Stop Valve of the utility model is to seal the position and separates with the throttling position, and adopt hard sealing of pottery and soft sealing to combine, valve seal is good, anti-scouring capability is strong, long service life, safe and reliable, and simple in structure, easily processing is applicable to that industries such as oil, rock gas and chemical industry are as throttling, by valves such as, blowdown, emptying.

Describe the utility model embodiment in detail below in conjunction with accompanying drawing.

Fig. 1: the utility model structural representation

The utility model is anti-to be washed away High-pressure Throttle Stop Valve it is made up of valve body, valve seat, flap and switching mechanism, valve body comprise upper valve body 1, with the pipe nipple 8 of upper valve body screw-thread fit and flanged 9; Flap comprises the valve petal body 4 that is connected with switching mechanism, is threaded with valve petal body 4, have on it guiding gutter 16 flap guide head 7, be positioned at the ceramic flap ring 5 between valve petal body 4 and flap guide head 7 fitting surfaces; Valve seat comprises valve body 3 and ceramic valve seat ring 2, and the two is pressed on the upper valve body by pipe nipple 8; Switching mechanism comprises the support 10 with upper valve body 1 screw-thread fit, be arranged on the valve rod 11 that is connected with valve petal body 4 in the support 10, stuffing box packing 15 between valve rod 11 and upper valve body 1 and filler pressure cap 14, be connected the Stem Mut 13 of valve rod 11 and support 10 and the handle 12 that is loaded on valve rod 11 upper ends.Be embedded in the soft seal ring 6 of 5 on valve petal body 4 and ceramic flap ring mutually.

Claims

1 one kinds of anti-High-pressure Throttle Stop Valves that wash away are made up of valve body, valve seat, flap and switching mechanism, it is characterized in that valve body comprise upper valve body, with upper valve body screw-thread fit and flanged (FLGD) pipe nipple; Flap comprises the valve petal body that is connected with switching mechanism, is threaded with valve petal body, have on it guiding gutter the flap guide head, be positioned at the ceramic flap ring between valve petal body and flap guide head fitting surface; Valve seat comprises valve body and ceramic valve seat ring, and the two is pressed on the upper valve body by pipe nipple.

2, the anti-High-pressure Throttle Stop Valve that washes away as claimed in claim 1 is characterized in that its upper end of the guiding gutter width on the flap guide head and the degree of depth is greater than the lower end.

3, the anti-High-pressure Throttle Stop Valve that washes away as claimed in claim 1 is characterized in that valve petal body lower end and ceramic flap interannular are embedded with soft seal ring.