CN207122586U - A kind of lengthening bonnet stop valve of back seal above attachment means - Google Patents

Abstract

The utility model provides a cut-off valve with an extended bonnet which is inverted and sealed above the connection device. The device mainly provides a stop valve with a sealing ring at the top of the valve stem. When the valve is fully opened, the valve stem drives the sealing ring upward. The sealing ring is completely sealed with the reverse seal above the extension device. Even if there is an error in the coaxiality between the reverse seal in the extension device and the valve stem, it can ensure that the two can be completely sealed to prevent the valve from leaking. Using packing for secondary sealing can further enhance the sealing performance of the valve.

Description

An extended bonnet shut-off valve with inverted seal above the connecting device

Technical field

The utility model relates to the field of automatic valves, in particular to an extended bonnet cut-off valve which is reverse-sealed above a connecting device. Its feature is that it can ensure that the valve stem and the upper seal are completely sealed when the valve is fully opened to prevent leakage.

Background technique

At present, the known extended bonnet globe valve is composed of a valve body, a valve disc, a valve disc cover, a valve stem, a gasket, a stud, a nut, a bonnet, an extension device, a packing pad, a packing, and a cylindrical pin that are sealed on the top. , Packing gland, packing plate, joint bolts, nuts, stem nuts, glands, countersunk screws, handwheels, washers, nuts assembled. However, because the length of the extension device is too long and the back seal is above, when the valve is fully opened, if there is an error in the coaxiality between the valve stem and the back seal, it will not be completely sealed effectively, and leakage will occur.

Utility model content

In order to overcome the problem that the valve stem and the reverse seal cannot be completely sealed in the cut-off valve with extended bonnet, the utility model provides a cut-off valve with a sealing ring on the valve stem. The technical scheme adopted by the utility model to solve the technical problem is: turn the original sealing position of the valve stem into a flat head, put a sealing ring on this position, and when the valve is fully opened, the sealing ring on the valve stem will be effectively in contact with the The reverse seal is in full contact to achieve the function of limit sealing and prevent the valve from leaking; specifically includes the valve body, valve disc, valve cover, valve stem, gasket, nut 1, stud, packing pad, cylindrical pin, packing, packing Compression sleeve, packing plate, bonnet, stem nut, countersunk head screw, nut 2, joint bolt, hand wheel, nut 3, washer, extension device, sealing ring; wherein, the sealing ring is installed on the valve stem, When the valve is fully opened, the valve rod drives the sealing ring upward, and the sealing ring is completely sealed with the inverted seal above the extension device, so as to solve the phenomenon of valve leakage.

The sealing ring adopts an O-ring and is installed in the sealing groove on the valve stem.

The upper part of the sealing ring is sealed with packing for secondary sealing, the lower part of the packing is supported by the packing pad placed above the extension device, and the upper part of the packing is pressed by the packing gland, and the packing gland is combined by the packing pressure plate Nut two, swivel bolts and straight pins are fastened together with the valve body.

The middle of the valve body of the stop valve is a valve stem that can travel up and down, and the end of the valve stem is fastened to the valve flap through the valve flap cover, and the valve flap goes down to the bottom to seal the valve body, thereby Shut-off function; above the inner chamber of the cut-off valve, use a nut and a stud to fasten the valve body and the extension device together, and there is a gasket in the middle; The countersunk screw fastens the valve cover on the valve stem; a handwheel is installed on the top of the stop valve, and the handwheel is fastened with a nut three, and a washer is sleeved in the middle.

The beneficial effect of the utility model is that even if there is an error in the concentricity between the reverse seal in the extension device and the valve stem, it can ensure that the two can be completely sealed without leakage.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the general assembly schematic diagram of the present utility model;

Fig. 2 is a partial enlarged view of part A in Fig. 1;

Valve body 1, valve disc 2, valve disc cover 3, valve stem 4, gasket 5, nut 1 6, stud 7, packing pad 8, cylindrical pin 9, packing 10, packing gland 11, packing plate 12, valve Cover 13, stem nut 14, countersunk screw 15, nut 2 16, joint bolt 17, hand wheel 18, nut 3 19, washer 20, extension device 21, sealing ring 22.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

As shown in Figures 1 to 2, an upside-down sealing two-stage welded low-temperature extended valve cover of the embodiment of the utility model specifically includes a valve body 1, a valve disc 2, a valve disc cover 3, a valve stem 4, and a gasket Sheet 5, Nut 1 6, Stud 7, Packing pad 8, Cylindrical pin 9, Packing 10, Packing gland 11, Packing plate 12, Valve cover 13, Stem nut 14, Countersunk head screw 15, Nut 2 16, Live Joint bolt 17, hand wheel 18, nut three 19, washer 20, extension device 21, sealing ring 22;

Wherein, the sealing ring 22 is installed on the valve stem 4. When the valve is fully opened, the valve stem 4 drives the sealing ring 22 upward, and the sealing ring 22 is completely sealed with the inverted seal above the extension device 21, so as to solve the phenomenon of valve leakage.

Further, the sealing ring 22 adopts an O-ring and is installed in the sealing groove on the valve stem 4 .

Further, the packing 10 is used for secondary sealing on the top of the sealing ring 22, the bottom of the packing 10 is supported by the packing pad 8 placed above the extension device 21, and the packing gland 11 is pressed on the top of the packing 10, and the packing gland 11 is formed by Packing plate 12 is fastened together with valve body 1 in conjunction with nut 2 16, swing bolt 17 and cylindrical pin 9.

Further, in the middle of the valve body 1 of the stop valve is a valve stem 4 that can travel up and down, and the end of the valve stem 4 is fastened to the valve flap 2 through the valve flap cover 3, and the valve flap 2 will go down to the bottom to seal the valve body 1, It plays the role of interception; the nut 6 and stud 7 are used above the inner cavity of the stop valve to fasten the valve body 1 and the extension device 21 together, and the gasket 5 is sealed in the middle; the stem nut is used at the upper end of the stop valve 14 and countersunk screw 15 fasten the bonnet 13 on the valve stem 4; the top of the stop valve is equipped with a hand wheel 18, the hand wheel 18 is fastened with a nut three 19, and a washer 20 is set in the middle.

Claims (4)

1. An extended bonnet shut-off valve that is reverse-sealed above the connecting device, specifically including a valve body (1), a valve disc (2), a valve disc cover (3), a valve stem (4), a gasket (5), Nut one (6), stud (7), packing pad (8), cylindrical pin (9), packing (10), packing gland (11), packing pressure plate (12), valve cover (13), valve stem Nut(14), countersunk head screw(15), nut 2(16), swing bolt(17), hand wheel(18), nut 3(19), washer(20), extension device(21), sealing ring (22); wherein, the sealing ring (22) is installed on the valve stem (4), and when the valve is fully opened, the valve stem (4) drives the sealing ring (22) upward, and the sealing ring ( 22) just completely seal with the inverted seal on the extension device (21) top. 2. A cut-off valve with an extended bonnet that is reverse-sealed above the connection device according to claim 1, characterized in that: the sealing ring (22) is an O-ring and is installed on the valve stem (4) in the sealing groove. 3. The extended bonnet cut-off valve with reverse sealing above the connection device according to claim 1, characterized in that: the top of the sealing ring (22) is sealed with a packing (10) for secondary sealing, and the packing The lower part of (10) is supported by the packing pad (8) placed above the extension device (21), and the packing (10) is pressed by the packing gland (11) above, and the packing gland (11) is formed by the packing Pressing plate (12) is fastened together with valve body (1) in conjunction with nut two (16), swing bolt (17) and cylindrical pin (9). 4. A cut-off valve with an extended bonnet that is reverse-sealed above the connection device according to claim 1, characterized in that: the middle of the valve body (1) of the cut-off valve is a valve stem (4) that can travel up and down , the end of the valve stem (4) is fastened to the valve disc (2) through the valve disc cover (3), and the valve disc (2) goes down to the bottom to seal the valve body (1) to cut off the flow Function: the valve body (1) and the extension device (21) are fastened together with a nut one (6) and a stud (7) above the inner cavity of the stop valve, and there is a gasket (5) in the middle for sealing ;Use stem nuts (14) and countersunk screws (15) at the upper end of the stop valve to fasten the bonnet (13) on the valve stem (4); the top of the stop valve is equipped with a hand wheel (18), said handwheel (18) is fastened with nut three (19), and is with washer (20) in the middle.