CN204300410U - High-pressure balanced type cock valve - Google Patents

Abstract

A high-pressure pressure-balanced plug valve. It solves the problem that the cock and gasket of the existing high-pressure cock valve are prone to leakage after long-term friction and damage, resulting in a low service life of the product. It includes a driving device, a valve body, a valve stem and a valve cover, the valve body is provided with a cock body, the driving device is connected with the cock body through the valve stem, and the valve cover is arranged at the lower part of the valve body , the valve cover is provided with a top block, the bottom of the cock body is provided with a spherical center, and the top block is provided with an arc-shaped groove matching the spherical center, and the valve cover is It is provided with an adjusting screw that offsets against the top block. The lower end of the cock body of the utility model adopts a spherical center to directly connect with the top block, which not only reduces the production cost and installation difficulty, but also makes the adjusting screw directly on the top block, which is easy to open and reduces the pre-tightening force of the adjusting screw. The hidden danger of leakage due to long-term friction and damage of the cock body and the gasket is solved.

Description

High Pressure Balanced Plug Valve

technical field

The utility model relates to a cock valve, in particular to a high-pressure pressure balanced cock valve.

Background technique

Pressure-balanced oil-sealed cock valve, the cock is inverted, the bottom of the cock body is large and the top is small, there is a through hole leading to the upper and lower end faces of the cock in the flow channel of the cock, and a check valve is set in the through hole leading to the small end , the inlet of the one-way valve is connected with the flow channel. When it is closed, the pressure on the large and small end faces is equal. Because the large end has a large working surface, the total force pushes the cock upwards, making the valve easy to seal. No, at this time the total effect of the small end is greater than that of the big end, and the cock is pushed down to reduce the opening torque and make it easier to open.

However, the bonnet of the ordinary pressure-balanced oil-sealed plug valve is sealed with the valve body through the sealing gasket, and the adjusting screw in the middle of the bonnet is transmitted to the top block and the center pre-tightening cock by the force added to the gasket by the spacer. , For high-pressure pressure-balanced oil-sealed plug valves, the force required to adjust the bolts is too large, and it is difficult to achieve a good initial sealing effect.

Contents of the invention

In order to solve the problem in the background art that the cock and gasket of the existing high-pressure cock valve are prone to leakage after long-term friction and damage, resulting in a low service life of the product, the utility model provides a high-pressure pressure balanced cock valve.

The technical scheme of the utility model is: a high-pressure pressure balanced plug valve, including a driving device, a valve body, a valve stem and a valve cover, the valve body is provided with a cock body, and the cock body is provided with a supply The flow channel for medium circulation, the driving device is connected with the cock body through the valve stem, the valve cover is set at the lower part of the valve body, the top block is arranged inside the valve cover, and the bottom of the cock body is set There is a spherical apex, the top block is provided with an arc-shaped groove matching the spherical apex, and the valve cover is provided with an adjusting screw that is offset against the top block.

As an improvement of the utility model, a first sealing assembly is provided between the top block and the valve cover, and the first sealing assembly includes a first sealing ring and a first sealing member.

As a further improvement of the utility model, the first sealing member is a graphite sealing packing.

As a further improvement of the present utility model, a second sealing assembly is provided between the valve cover and the valve body, and the second sealing assembly includes a second sealing ring and a second sealing member.

As a further improvement of the present utility model, the valve cover is provided with a step, and the second sealing member is provided on the step.

As a further improvement of the utility model, the second sealing member is a sealing washer.

As a further improvement of the utility model, the valve stem is provided with a plastic sealing packing groove, and the valve body is provided with an emergency sealing valve communicating with the plastic sealing packing groove.

As a further improvement of the utility model, the valve stem communicates with the cock body through a connecting sleeve.

As a further improvement of the utility model, the upper part of the cock body is provided with a square groove, and the bottom of the connecting sleeve is provided with a protrusion matching the square groove.

The beneficial effect of the utility model is that the lower end of the cock body adopts a spherical top center to directly connect with the top block, canceling the setting of gaskets and pads under the top block, which not only reduces the production cost and installation difficulty, but also makes the adjustment screw directly push On the top block, it is easy to open, reduces the pre-tightening force of the adjusting screw, and solves the hidden danger of leakage due to long-term friction between the cock body and the gasket. Moreover, the utility model also has the advantages of simple structure, convenient assembly and low production cost.

Description of drawings

Accompanying drawing 1 is the structural representation of the utility model embodiment.

Accompanying drawing 2 is the enlarged schematic diagram of the structural section of A-A in the accompanying drawing 1.

Accompanying drawing 3 is the structural enlarged schematic view of I place in accompanying drawing 1.

In the figure, 1. driving device; 2. valve body; 21. cock body; 211. flow channel; 212. square groove; 22. emergency sealing valve; 3. valve stem; 31. plastic sealing packing groove; 4. valve Cover; 41, steps; 5, top block; 51, arc groove; 6, spherical center; 7, adjusting screw; 8, first sealing assembly; 81, first sealing ring; 82, first sealing member; 9 , the second sealing assembly; 91, the second sealing ring; 92, the second sealing member; 10, the connection sleeve; 101, the bump.

Detailed ways

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

As shown in Fig. 1 in conjunction with Fig. 2 and Fig. 3, a high-pressure pressure balanced plug valve includes a driving device 1, a valve body 2, a valve stem 3 and a valve cover 4, and the valve body 2 is provided with a cock body 21 Specifically, the cock body is a cone with a small upper part and a larger lower part (the upper part and the lower part of the cock body mentioned in the utility model refer to accompanying drawing 1, the same below). The cock body 21 is provided with a channel 211 for the medium to flow through, specifically, the channel is a trapezoidal channel. The driving device 1 is connected to the cock body 21 through the valve stem 3, specifically, the driving device is a turbine driving device. The valve cover 4 is arranged on the lower part of the valve body 2, the valve cover 4 is provided with a top block 5, the bottom of the cock body 21 is provided with a spherical center 6, and the top block 5 is provided with a The arc-shaped groove 51 matched with the spherical center 6 , and the valve cover 4 is provided with an adjusting screw 7 against the top block 5 . The beneficial effect of the utility model is that the lower end of the cock body adopts a spherical top center to directly connect with the top block, canceling the setting of gaskets and pads under the top block, which not only reduces the production cost and installation difficulty, but also makes the adjustment screw directly push On the top block, it is easy to open, reduces the pre-tightening force of the adjusting screw, and solves the hidden danger of leakage due to long-term friction between the cock body and the gasket. Moreover, the utility model also has the advantages of simple structure, convenient assembly and low production cost.

A first sealing assembly 8 is provided between the top block 5 and the valve cover 4 , and the first sealing assembly 8 includes a first sealing ring 81 and a first sealing member 82 . Specifically, the first sealing member 82 is a graphite sealing packing. Specifically, a second sealing assembly 9 is provided between the valve cover 4 and the valve body 2 , and the second sealing assembly 9 includes a second sealing ring 91 and a second sealing member 92 . More specifically, the valve cover 4 is provided with a step 41 , and the second sealing member 92 is provided on the step 41 . More specifically, the second seal 92 is a gasket. More specifically, both the first sealing ring and the second sealing ring are O-rings. This structure ensures that the medium will not leak from the lower part of the valve body and the valve cover, and the first and second sealing components make the product seal reliable and have a long service life.

The valve stem 3 is provided with a plastic sealing packing groove 31 , and the valve body 2 is provided with an emergency sealing valve 22 communicating with the plastic sealing packing groove 31 . The emergency sealing valve is mainly used for emergency grease injection to the plastic sealing packing groove when the upper part of the cock body leaks, so as to ensure the reliable operation of the product. Specifically, the emergency sealing valve is a one-way valve.

The valve stem 3 communicates with the cock body 21 through the connecting sleeve 10 . Specifically, the upper part of the cock body 21 is provided with a square groove 212 , and the bottom of the connecting sleeve 10 is provided with a protrusion 101 matching the square groove 212 . Such a structure ensures reliable transmission of the product and the opening or closing of the cock body.

Notes to all technical personnel: Although the utility model has been described according to the above-mentioned specific embodiments, the inventive idea of the utility model is not limited to this utility model, and any modification using the inventive idea will be included in the protection scope of the patent right Inside.

Claims (9)

1. A high-pressure pressure-balanced plug valve, including a driving device (1), a valve body (2), a valve stem (3) and a valve cover (4), and the valve body (2) is provided with a plug body (21), the cock body (21) is provided with a flow channel (211) for medium circulation, the drive device (1) is connected to the cock body (21) through the valve stem (3), the The bonnet (4) is set at the lower part of the valve body (2), and it is characterized in that: the bonnet (4) is provided with a top block (5), and the bottom of the cock body (21) is provided with a spherical top center (6), the top block (5) is provided with an arc-shaped groove (51) matching the spherical center (6), and the valve cover (4) is provided with a top block (5) ) offset the adjusting screw (7). 2. The high-pressure pressure balanced plug valve according to claim 1, characterized in that a first sealing assembly (8) is provided between the top block (5) and the valve cover (4), and the first The sealing assembly (8) includes a first sealing ring (81) and a first sealing member (82). 3. The high-pressure pressure balanced plug valve according to claim 2, characterized in that the first sealing member (82) is a graphite sealing packing. 4. The high-pressure pressure balanced plug valve according to claim 2, characterized in that a second sealing assembly (9) is provided between the valve cover (4) and the valve body (2), and the second The sealing assembly (9) includes a second sealing ring (91) and a second sealing member (92). 5. The high-pressure pressure balanced plug valve according to claim 4, characterized in that there is a step (41) on the valve cover (4), and the second seal (92) is set on the step (41). )superior. 6. The high-pressure pressure balanced plug valve according to claim 4 or 5, characterized in that the second seal (92) is a sealing washer. 7. The high-pressure pressure balanced plug valve according to claim 1, characterized in that the valve stem (3) is provided with a plastic seal packing groove (31), and the valve body (2) is provided with a The emergency sealing valve (22) connected with the plastic sealing stuffing groove (31). 8. The high-pressure pressure balanced plug valve according to claim 1, characterized in that the valve stem (3) communicates with the plug body (21) through a connecting sleeve (10). 9. The high-pressure pressure balanced plug valve according to claim 8, characterized in that the upper part of the plug body (21) is provided with a square groove (212), and the bottom of the connecting sleeve (10) is provided with a The square groove (212) matches the protrusion (101).