CN2428650Y

CN2428650Y - Flush-etch-resisting double-way-flow self-cleaning discharging valve

Info

Publication number: CN2428650Y
Application number: CN 00223769
Authority: CN
Inventors: 王硕明; 钟慧容; 彭文康; 徐加庆
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-07-21
Filing date: 2000-07-21
Publication date: 2001-05-02
Anticipated expiration: 2010-07-21

Abstract

The utility model discloses a flush-etch-resisting double-way-flow self-cleaning discharging valve, which is mainly composed of a valve body, an upper valve cover, a valve holder, a valve cover, a valve core and a valve stem. The lower end of the valve core is fixedly connected with a core bottom block; an annular dovetail groove arranged in the connected circumference of the valve core and the core bottom block is embedded with a sealing ring and is provided with a balance air drain to effectively avoid directly flushing the sealing ring by the medium in a high flow velocity in the discharging work and balance the negative pressure formed by the high-velocity flow in discharging to prevent the sealing ring from being sucked out and dropping to ensure the sealing performance. The medium can be discharged in double-way-flow forward or backward. The utility model has the advantages of simple structure, good sealing performance, reliable operation and long service life.

Description

Erosion resistance bidirectional flow self-cleaning type atmospheric valve

The utility model relates to unlatching or the shut-off means of being with closure member, and specifically a kind of erosion resistance bidirectional flow self-cleaning type atmospheric valve is specially adapted to rock gas, coal gas, liquid gas gathering line, stands, the field does emergency blow-down and use.

Just present, at petrochemical industry gathering line and station, generally all be common stop valve to be installed use on the basin equipment of field as atmospheric valve, because absolute pressure reduction is big during emergency blow-down, gas flow rate is very high, rust staining in pipeline and the basin, the impurity foul can together discharge with medium, and the throttling position during medium emptying just, the main sealing position of common stop valve, the foul impurity of carrying secretly in the flow at high speed medium is very serious to the sealed member erosive wear, foul impurity also can residually accumulate sealing position in the valve, have a strong impact on the working environment of cleaning in the valve, quicken the abrasion of sealed member, cause seal failure, shorten the operating life of stop valve greatly.Recently, occurred a kind ofly in valve body, installing the cage type valve pocket that offers throttle orifice additional, be fitted to the atmospheric valve that spool in the cage type valve pocket offers equalizing orifice, is embedded with the soft seal circle at the valve seat place, the sealing pair of this atmospheric valve separates with throttle orifice, can slow down the medium degradation degree effectively, improve sealability, prolong the operating life of atmospheric valve.But, this atmospheric valve still can accumulate foul impurity on the soft seal circle surface at valve seat place, particularly when the inlet/outlet pipe reversal connection of valve body, it is even more serious to accumulate foul impurity, directly influence the working environment of cleaning in the valve, and the negative pressure that swiftly flowing medium forms causes seal failure with the soft seal circle sucking-off of valve seat place setting-in easily, thereby influences the atmospheric valve proper functioning.

The purpose of this utility model be propose on the basis of existing technology a kind of simple in structure, can guarantee the working environment of cleaning in the valve, erosion resistance bidirectional flow self-cleaning type atmospheric valve with reliable sealing performance and reliable operation.

The purpose of this utility model is achieved by the following technical solution:

A kind of erosion resistance bidirectional flow self-cleaning type atmospheric valve, it is mainly by the valve body that bottom flange is installed, be connected in the bonnet of valve body, vavle shelf, be installed in the valve body and offer the valve pocket of throttle orifice, the valve rod that is fitted in the valve pocket and offers the spool of balance through hole and be fixedly connected on spool constitutes, it is characterized in that the spool lower end that is fitted to valve pocket is fixedly connected with the core sole piece, in joining the ring-type dovetail groove that the circumference place does, spool and core sole piece be embedded with seal ring, during the emptying operation, be higher than the throttle orifice of offering on the sleeve wall owing to be flush-mounted in the seal ring of spool, can avoid the direct erosion seal ring of swiftly flowing medium effectively, air pressure balance duct has been done in ring-type dovetail groove bottom, but the negative pressure that high velocity air forms during balance emptying, can prevent effectively that seal ring is sucked out comes off, guarantee the seal operation performance, be flush-mounted in when seal ring on the spool moves in valve pocket and form from the cleaning effect, the inlet tube of valve body during installation, the interchangeable installation of outer pipe, medium bidirectional flow emptying forward or backwards can guarantee that all sealing surfaces has the clean working environment of cleaning in the valve.

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

Fig. 2 is the partial enlarged drawing of Fig. 1;

Work schematic representation when Fig. 3 is the utility model emptying.

The utility model is to offer throttle orifice on the sleeve wall of installing in valve body, be fitted to the fixedly connected core sole piece in spool lower end in the valve pocket, embedded sealing ring in spool and core sole piece join the ring-type dovetail groove that the circumference place does, can avoid the direct erosion sealed member of swiftly flowing medium during the emptying operation, but the negative pressure that high velocity air forms when doing the emptying of air pressure balance duct balance in ring-type dovetail groove bottom, can prevent effectively that seal ring is sucked out comes off, guarantee the seal operation unfailing performance, be flush-mounted in when seal ring on the spool moves in valve pocket and form from the cleaning effect, the inlet tube of valve body during installation, the interchangeable installation of outer pipe, medium bidirectional flow emptying forward or backwards can guarantee that all sealing surfaces has the clean working environment of cleaning in the valve, it is extremely convenient to install and use, be specially adapted to the operating mode bad working environment, still can guarantee its sealability and prolong operating life.

Below in conjunction with accompanying drawing the utility model is further described:

A kind of erosion resistance bidirectional flow self-cleaning type atmospheric valve, it is mainly by the valve body 8 that bottom flange 9 is installed, be connected in the bonnet 5 of valve body 8 by bolt 4, vavle shelf 3, be installed in the valve body 8 and offer the valve pocket 13 of throttle orifice 11, the valve rod 2 that is fitted in the valve pocket 13 and offers the spool 6 of balance through hole 12 and be fixedly connected on spool 6 constitutes, handle 1 is installed on the valve rod 2, spool 6 lower ends that are fitted to valve pocket 13 are fixedly connected with sealing gasket 16 and core sole piece 10 by screw 7, in joining the ring-type dovetail groove 17 that the circumference place does, spool 6 and core sole piece 10 be embedded with seal ring 14, because the seal ring 14 that is flush-mounted in spool 6 is higher than the position of the throttle orifice of offering on valve pocket 13 walls 11, can avoid the direct erosion seal ring 14 of swiftly flowing medium during the emptying operation effectively, but the negative pressure that high velocity air forms when doing air pressure balance duct 15 balance emptying in ring-type dovetail groove 17 bottoms, can prevent effectively that seal ring 14 is sucked out comes off, guarantee the seal operation reliability, be flush-mounted in when seal ring 14 on the spool 6 moves in valve pocket 13 and form from the cleaning effect, it is clean to keep seal ring 14 surfaces self cleaning, the inlet tube of valve body 8 during installation, the interchangeable installation of outer pipe, medium can be along the forward or the emptying of opposite direction bidirectional flow of arrow 18, can guarantee that all valve inner seal ring 14 surfaces have the clean working environment of cleaning, it is extremely convenient to install and use, be specially adapted to the operating mode bad working environment, still can guarantee its sealability and the operating life that prolongs atmospheric valve.

Claims

1. erosion resistance bidirectional flow self-cleaning type atmospheric valve, it is mainly by the valve body that bottom flange (9) are installed (8), be connected in the bonnet (5) of valve body (8), vavle shelf (3), be installed in the valve body (8) and offer the valve pocket (13) of throttle orifice (11), be fitted in the valve pocket (13) and offer the spool (6) of balance through hole (12) and be fixedly connected on valve rod (2) formation of spool (6), spool (6) lower end that it is characterized in that being fitted to valve pocket (13) is fixedly connected with core sole piece (10), be embedded with seal ring (14) in spool (6) and core sole piece (10) join the ring-type dovetail groove (17) that the circumference place does, air pressure balance duct (15) has been done in ring-type dovetail groove (17) bottom.