CN2530114Y

CN2530114Y - Throttle and check atmospheric valve

Info

Publication number: CN2530114Y
Application number: CN 02221736
Authority: CN
Inventors: 杨叶
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-03-04
Filing date: 2002-03-04
Publication date: 2003-01-08
Anticipated expiration: 2012-03-04

Abstract

The utility model provides a throttle stop blow-down valve, comprising a valve body, a lower cover, an upper cover and a valve cap in the valve body and a valve rod with a fixedly arranged handwheel. A nose of the valve rod is inserted in a groove on an upper of the valve core, a frustum surface is disposed at a bottom of the valve core, forming a hard sealing secondary structure with an inside corner of a valve core seat, a soft sealing secondary structure is formed of an O-shaped seal ring, a conical seal ring and the valve core, which are combined and inserted in a nose wedge cone-ring chamber between a couple of sealing guide rings, a balance air duct communicated with the nose wedge cone-ring chamber is positioned on the sealing guide rings, so as to balance negative pressure produced by the high-speed moved gaseous medium, prevent the seal ring from falling down by the negative pressure and ensure the highly reliable sealing performance.

Description

Throttling is by atmospheric valve

Technical field:

The utility model belongs to the valve class, and specifically a kind of throttling is by atmospheric valve, it be particularly suitable for petrochemical industry rock gas, coal gas, liquid gas the transmission ﹠ distribution field, stand and pipeline system do throttling, by and emergency blow-down use.

Background technique:

For now, storing transmission ﹠ distribution production, the life rock gas, in Large Storage Tanks such as coal gas and liquid gas gas tank body and the pipe-line system, be extensive use of various control valves, the most commonly throttle valve and flashboard type stop valve, also have this class valve is made emergency blow-down usefulness, because the throttling position and the sealed member of this class valve are nearer, the direct erosive wear sealed member of gas medium meeting, very easily cause sealed member to lose efficacy and influence proper functioning life-span of valve, particularly under the high pressure operating mode, do the emptying time spent, swiftly flowing gas medium can carried tank body secretly, the rust staining impurity that inner-walls of duct is residual, erosive wear to sealed member is even more serious, aggravated the degree of wear of sealed member, because the gas of high-speed motion can form the certain negative pressure district during emergency blow-down, seal ring also usually occurs by the phenomenon of negative pressure sucking-off, directly cause valve seal to lose efficacy, have a strong impact on the proper functioning of valve.

Summary of the invention:

The utility model be propose on the basis of existing technology a kind of novel, reasonable in design, throttling with highly reliable sealability is by atmospheric valve, the throttling that the utility model proposes is by atmospheric valve, it is mainly by valve body, be installed on the lower cover of valve body, the loam cake of fuel filler neck is installed, bonnet constitutes with the valve rod that is installed with handwheel, the throttling tube is installed in valve body, the wall of throttling tube is provided with one group of throttle orifice, the bottom of throttling tube is fitted with a pressure ring, the spool of doing the balance pore is fitted in the throttling tube, the balance pore is set can make spool move up and down freely, the plush copper of valve rod is flush-mounted in the groove on spool top, it is characterized in that having done the frustum face in the bottom of spool, be installed on the inside corner of the valve core case in the throttling tube and the frustum face of spool bottom and constitute hard sealing pair structure, be installed on and constitute nose key formula conical ring chamber between a pair of sealing lead ring in the throttling tube, combination is flush-mounted in " O " shape seal ring and conical seal ring and the spool formation soft seal auxiliary structure in the nose key formula conical ring chamber, in the time of in off position, can guarantee its sealability effectively by hard sealing pair with in the secondary two seals system that constitutes of soft seal that conical seal ring overcoat " O " shape seal ring is formed, on the sealing lead ring, do the air pressure balance duct that communicates with nose key formula conical ring chamber, when gas medium enters nose key formula conical ring chamber by air pressure balance duct in, conical seal ring is subjected to the pressure effect of " O " shape seal ring and projection and spool form tight sealing surface, can obtain more efficiently sealing effect, when the rotation handwheel is mentioned throttling spool emptying, nose key formula conical ring intracavity gas is discharged by air pressure balance duct, but the negative pressure that the gas medium of the air pressure balance duct balance high-speed motion that communicates with nose key formula conical ring chamber produces, thereby eliminate the pressure of conical seal ring to spool, make spool can leave sealing surface smoothly, can prevent effectively that seal ring from being come off by the negative pressure sucking-off, prolong the proper functioning life-span of valve effectively, thisly constitute nose key formula conical ring chamber by the sealing lead ring of doing air pressure balance duct, and in nose key formula conical ring chamber, make up the structure that setting-in " O " shape seal ring and conical seal ring constitute the soft seal pair, also can be used for throttling, end, other valve series products such as blowdown valve all has good sealing effect.

Description of drawings:

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

Fig. 2 is that the utility model is soft, the local enlarged diagram of hard seal combination;

Fig. 3 is the local enlarged diagram in nose key formula conical ring of the present utility model chamber;

Fig. 4 is the plan view of Fig. 3.

Embodiment:

The throttling that the utility model proposes is by atmospheric valve, it is mainly by valve body 1, be installed on the lower cover 13 of valve body 1, the loam cake 6 of fuel filler neck 5 is installed, bonnet 4 constitutes with the valve rod 2 that is installed with handwheel 3, throttling tube 7 is installed in valve body 1, the wall of throttling tube 7 is provided with one group of throttle orifice 9, the bottom of throttling tube 7 is fitted with a pressure ring 11, the spool 8 of doing balance pore 18 is fitted in the throttling tube 7, balance pore 18 is set can make spool 8 move freely in throttling tube 7, the plush copper 19 of valve rod 2 is flush-mounted in the groove on spool 8 tops, frustum face 20 has been done in the bottom of spool 8, be installed on the inside corner of the valve core case 12 in the throttling tube 7 and the frustum face 20 of spool 8 bottoms and constitute hard sealing pair structure, be installed on and constitute nose key formula conical ring chamber 14 between a pair of sealing lead ring 10 in the throttling tube 7, " O " shape seal ring 17 and conical seal ring 16 that combination is flush-mounted in the nose key formula conical ring chamber 14 constitute the soft seal auxiliary structure with spool 8, adopt the mode of " O " shape seal ring 17 and conical seal ring 16 combination seals, can improve the sealing effect of soft seal pair effectively, when closing, can guarantee its sealability effectively by hard sealing pair and the secondary two seals system that forms of soft seal, sealing lead ring 10 is provided with the air pressure balance duct 15 that communicates with nose key formula conical ring chamber 14, when rotation handwheel 3 is mentioned spool 8 throttling emptying, but air pressure balance duct 15 balances that communicate with nose key formula conical ring chamber 14 are because the negative pressure that gas medium produced of high-speed motion, can prevent effectively that conical seal ring 16 and " O " shape seal ring 17 from being come off by the negative pressure sucking-off, can guarantee that its sealing system has highly reliable sealability, safeguard the normal working of valve effectively, when installing and using, all there is good sealing effect the interchangeable position of the entrance point of valve body 1 and outlet end.

Claims

1. a throttling is by atmospheric valve, it is mainly by valve body (1), be installed on the lower cover (13) of valve body (1), loam cake (6), bonnet (4) and the valve rod (2) that is installed with handwheel (3) constitute, throttling tube (7) is installed in valve body (1), the wall of throttling tube (7) is provided with one group of throttle orifice (9), the bottom of throttling tube (7) is fitted with a pressure ring (11), the spool (8) of doing balance pore (18) is fitted in the throttling tube (7), the plush copper (19) of valve rod (2) is flush-mounted in the groove on spool (8) top, it is characterized in that having done frustum face (20) in the bottom of spool (8), be installed on the inside corner of the valve core case (12) in the throttling tube (7) and the frustum face (20) of spool (8) bottom and constitute hard sealing pair structure, be installed on and constitute nose key formula conical ring chamber (14) between a pair of sealing lead ring (10) in the throttling tube (7), " O " shape seal ring (17) and conical seal ring (16) that combination is flush-mounted in the nose key formula conical ring chamber (14) constitute the soft seal auxiliary structure with spool (8), and sealing lead ring (10) is done the air pressure balance duct (15) that communicates with nose key formula conical ring chamber (14).