CN204610847U - The bidirectional balanced ring assembly of telescoping valve - Google Patents

Abstract

The utility model relates to a bidirectional balance sealing ring assembly for a sleeve valve, comprising a valve body and a valve seat, a sleeve is installed on the upper part of the valve seat, and a balance ring seat is installed on the upper part of the sleeve; A groove is provided at the matching place, and the first anti-extrusion ring, the first balance seal ring, the support ring, the second balance seal ring and the second anti-extrusion ring are installed in the groove from bottom to top, and the first anti-extrusion ring and One side of the second anti-extrusion ring is a stop contact round head, and the root of the stop contact round head forms a shoulder; one side of the first balance seal ring and the second balance seal ring is provided with an open groove, and the first anti-extrusion The stop contact round head of the outgoing ring is arranged in the open groove of the first balance seal ring, and the stop contact round head of the second anti-extrusion ring is arranged in the open groove of the second balance seal ring. The utility model satisfies the requirement of two-way sealing of the valve, the movement of the valve core is stable and reliable, and the vibration and noise of the valve core are significantly reduced.

Description

Sleeve valve two-way balance seal ring assembly

technical field

The utility model relates to a sleeve valve bidirectional balance sealing ring assembly, in particular to a sleeve valve sealing assembly capable of bearing forward and reverse pressures as the flow direction of the working medium in the valve changes, and belongs to the technical field of regulating valves.

Background technique

In chemical industry, petroleum, electric power, metallurgy and other industrial places, sleeve control valves are widely used. It has the characteristics of stable and reliable action, large adjustment capacity, and small thrust of the required actuator. The trim structure of the traditional sleeve regulating valve has two forms, one is the double hard sealing surface structure composed of the valve seat, the valve core, the valve stem and the sleeve, and the other is the valve seat, the valve core, the valve stem, The soft and hard sealing surface structure composed of the balance seal ring and the balance ring seat.

With the continuous innovation of industrial production process technology, the requirements of production technology for chemical equipment are also gradually increasing, which requires that various valves on chemical equipment must meet the continuous changes of on-site technology. For example, in the on-site process pipeline, the direction of the medium flowing through the sleeve regulating valve is open relative to the valve. In the case of a change in the production process, the direction of the medium flowing through the sleeve regulating valve in the process pipeline will be reversed, that is, it will be closed for the valve. When the above situation occurs, for the above two structures, the former can meet the requirements of the working conditions, but because of the double hard sealing surface structure, the machining accuracy of the valve trim is required to be extremely high, and the cost of manufacturing is high. The leakage level is difficult to reach level IV or level V, which will directly affect the quality of the product in the production device; for the latter, the change of flow direction makes the balance seal ring unable to withstand the reverse medium pressure, resulting in the failure of the balance seal ring, so that the medium passes through The gap between the sleeve and the valve core directly leaks to the back of the valve, and when the valve core loses the guiding function of the balance sealing ring, the valve core will vibrate intensified or even get stuck when the valve core moves up and down in the inner cavity of the sleeve. Scratch the inner cavity of the sleeve, and the phenomenon of noise amplification will also appear, which will eventually affect the adjustment performance of the valve and cannot meet the use requirements after the process change.

Contents of the invention

The purpose of the utility model is to overcome the deficiencies in the prior art, and provide a sleeve valve bidirectional balance seal ring assembly, the balance seal ring can bear the forward and reverse pressure of the medium, and meet the requirements of the process pipeline for the two-way sealing of the valve. The movement is stable and reliable during the movement process, significantly reducing the vibration and noise of the valve core, improving the adjustment accuracy of the valve, and ensuring product quality.

According to the technical solution provided by the utility model, a sleeve valve bidirectional balance sealing ring assembly includes a valve body, an upper cover is installed on the upper part of the valve body, a valve seat is installed on the middle partition of the valve body, and a sleeve is installed on the upper part of the valve seat , the valve core is installed in the sleeve, the balance ring seat is installed on the upper part of the sleeve, and the top cover is installed on the upper part of the balance ring seat and the upper part of the valve body; it is characterized in that: a groove is provided at the matching place between the sleeve and the balance ring seat, Install the first anti-extrusion ring, the first balance seal ring, the support ring, the second balance seal ring and the second anti-extrusion ring from bottom to top in the groove; the first anti-extrusion ring and the second One side of the anti-extrusion ring is a stop contact round head, and the root of the stop contact round head forms a shoulder; one side of the first balance seal ring and the second balance seal ring is provided with an open groove, and the first balance seal ring The opening groove faces downward, and the opening groove of the second balance sealing ring faces upward; the stop contact round head of the first anti-extrusion ring is set in the opening groove of the first balance sealing ring, and the stop contact round head of the second anti-extrusion ring The dynamic contact round head is arranged in the open groove of the second balance sealing ring.

Further, the edges of the open grooves of the first balanced seal ring and the second balanced seal ring are PTFE lips, and stainless steel springs are arranged in the open grooves of the first balanced seal ring and the second balanced seal ring, and the stainless steel springs are along the opening The inner wall of the groove is arranged; the PTFE lip is located on both sides of the open groove, and the PTFE lip protrudes from the side wall of the open groove.

Further, the material of the first anti-extrusion ring, the second anti-extrusion ring and the support ring is PEEK.

Further, the inner hole of the support ring is in contact with the outer circle of the valve core, and the upper and lower planes of the support ring are respectively in contact with the first balance seal ring and the second balance seal ring.

The utility model has the following beneficial effects: the balance sealing ring and the anti-extrusion ring are symmetrically installed in the groove of the sleeve and the balance ring seat, the balance sealing ring can bear the positive and negative pressure of the medium, and meet the requirements of the process pipeline for the two-way sealing of the valve , It is not necessary to frequently replace valve trims due to changes in working conditions, saving costs. The valve core moves smoothly and reliably during movement, significantly reducing valve core vibration and noise, improving valve adjustment accuracy, and ensuring product quality.

Description of drawings

Fig. 1 is the structural representation of the utility model.

FIG. 2 is an enlarged view of A in FIG. 1 .

Detailed ways

Below in conjunction with specific accompanying drawing, the utility model is further described.

As shown in Figures 1 to 2: the sleeve valve bidirectional balance seal ring assembly includes a valve body 1, a valve seat 2, a sleeve 3, a valve core 4, a balance ring seat 5, an upper cover 6, a first anti-extrusion Ring 7-1, second anti-extrusion ring 7-2, first balance seal ring 8-1, second balance seal ring 8-2, support ring 9, stainless steel spring 10, etc.

As shown in Figure 1, the utility model includes a valve body 1, an upper cover 6 is installed on the upper part of the valve body 1, a valve seat 2 is installed at the middle partition of the valve body 1, and a graphite composite pad is arranged between the valve body 1 and the valve seat 2 Install the sleeve 3 on the upper part of the valve seat 2, install the valve core 4 in the sleeve 3, install the balance ring seat 5 on the upper part of the sleeve 3, install the upper part of the balance ring seat 5 and the upper part of the valve body 1 respectively Graphite composite gasket, and press the graphite composite gasket through the upper cover 1; as shown in Figure 2, a groove is set at the joint between the sleeve 3 and the balance ring seat 5, and in the groove from bottom to top Install the first anti-extrusion ring 7-1, the first balance seal ring 8-1, the support ring 9, the second balance seal ring 8-2 and the second anti-extrusion ring 7-2; the first anti-extrusion One side of the ring 7-1 and the second anti-extrusion ring 7-2 is a stop contact round head, and the root of the stop contact round head forms a shoulder; the first balance seal ring 8-1 and the second balance seal ring One side of 8-2 is provided with an opening groove, the opening groove of the first balance sealing ring 8-1 faces downward, and the opening groove of the second balance sealing ring 8-2 faces upward; the opening groove of the first anti-extrusion ring 7-1 The stop contact round head is set in the open groove of the first balance seal ring 8-1, and the stop contact round head of the second anti-extrusion ring 7-2 is set in the open groove of the second balance seal ring 8-2;

The edges of the opening grooves of the first balancing sealing ring 8-1 and the second balancing sealing ring 8-2 are PTFE lips, and the opening grooves of the first balancing sealing ring 8-1 and the second balancing sealing ring 8-2 A stainless steel spring 10 is arranged inside, and the stainless steel spring 10 is arranged along the inner wall of the open groove; the PTFE lip is positioned at both sides of the open groove, and the PTFE lip protrudes from the side wall of the open groove; the stainless steel spring 10 wraps the PTFE lip Closely fit on the outer circle of the valve core 4 and the inner hole of the balance ring seat 5 to form a sealing effect, and can compensate for the wear of the PTFE lip;

The material of the first anti-extrusion ring 7-1, the second anti-extrusion ring 7-2 and the support ring 9 is PEEK; the support ring 9 has self-lubricating properties and excellent mechanical properties, and the inner surface of the support ring 9 The hole fits the outer circle of the valve core 4, and the upper and lower planes of the support ring 9 are respectively in contact with the first balance seal ring 8-1 and the second balance seal ring 8-2, so as to ensure that the balance seal ring works stably after being installed in place without mutual extrusion. pressure effect.

The working principle of the utility model is as follows: the valve core 4 moves up and down in the sleeve 3 to adjust the flow rate, the first balance seal ring 8-1, the second balance seal ring 8-2 and the outer circle of the valve core 4 form a soft seal structure, The stainless steel spring 10 in the first balance seal ring 8-1 and the second balance seal ring 8-2 can compensate the wear of the PTFE lip. When the valve is open, the PTFE lip of the second balance seal ring 8-2 on the upper part of the support ring 9 is tightly attached to the outer circle of the valve core 4 and the inner hole of the balance ring seat 5 through the medium and the force of the stainless steel spring 10. The first balance sealing ring 8-1 at the lower part of the support ring 9 moves to the stop contacting round head of the first anti-extrusion ring 7-1 under the force of the medium to protect the performance of the first balance sealing ring 8-1 intact; In the flow-off state, the PTFE lip of the first balance seal ring 8-1 is tightly attached to the outer circle of the valve core 4 and the inner hole of the balance ring seat 5 through the medium and the force of the stainless steel spring, and the second balance seal ring 8-1 2. Move to the stop contact round head of the second anti-extrusion ring 7-2 under the force of the medium to protect the performance of the second balance sealing ring 8-2. Sleeve valve bi-directional balanced sealing ring assembly structure has remarkable sealing performance, and cooperates with the hard sealing structure of valve core 4 and valve seat 2, the leakage level reaches above level V, which meets the requirements of on-site working conditions change.

Claims (4)

1. the bidirectional balanced ring assembly of telescoping valve, comprise valve body (1), upper cover (6) is installed on valve body (1) top, at the central diaphragm place of valve body (1), valve seat (2) is installed, on valve seat (2) top installing sleeve (3), install spool (4) in sleeve (3), balance ring seat (5) is installed on sleeve (3) top, and upper cover (1) is installed on the top of balance ring seat (5) and the top of valve body (1); It is characterized in that: groove is set at described sleeve (3) and the cooperation place of balance ring seat (5), the first anti-extrusion ring (7-1), the first balanced seal ring (8-1), support ring (9), the second balanced seal ring (8-2) and the second anti-extrusion ring (7-2) are installed in the groove from bottom to up successively; The side of described first anti-extrusion ring (7-1) and the second anti-extrusion ring (7-2) is stop contact round end, and the root of stop contact round end forms shoulder; The side of described first balanced seal ring (8-1) and the second balanced seal ring (8-2) arranges opening slot, and down, the opening slot of the second balanced seal ring (8-2) upward for the opening slot of the first balanced seal ring (8-1); The stop contact round end of described first anti-extrusion ring (7-1) is arranged in the opening slot of the first balanced seal ring (8-1), and the stop contact round end of the second anti-extrusion ring (7-2) is arranged in the opening slot of the second balanced seal ring (8-2).

2. the bidirectional balanced ring assembly of telescoping valve as claimed in claim 1, it is characterized in that: the edge of the opening slot of described first balanced seal ring (8-1) and the second balanced seal ring (8-2) is PTFE antelabium, in the opening slot of the first balanced seal ring (8-1) and the second balanced seal ring (8-2), arrange stainless steel spring (10), stainless steel spring (10) is arranged along the inwall of opening slot; Described PTFE antelabium is positioned at the both sides of opening slot, and PTFE antelabium protrudes from the sidewall of opening slot.

3. the bidirectional balanced ring assembly of telescoping valve as claimed in claim 1, is characterized in that: the material of described first anti-extrusion ring (7-1), the second anti-extrusion ring (7-2) and support ring (9) is PEEK.

4. the bidirectional balanced ring assembly of telescoping valve as claimed in claim 1, it is characterized in that: endoporus and spool (4) cylindrical of described support ring (9) are fitted, the lower planes of support ring (9) contacts with the second balanced seal ring (8-2) with the first balanced seal ring (8-1) respectively.