Drain valve with double-sealing-face valve seat

Abstract

The utility model relates to the technical field of drain valves, in particular to a drain valve with a double-sealing-surface valve seat, which comprises a valve body and a valve seat, the valve seat is detachably mounted in the valve body in a sealing manner, the valve seat is of a vertically symmetrical structure, and the upper side and the lower side in the valve seat are respectively provided with a sealing surface used for being matched with a valve clack for use. The valve seat is detachably mounted in the valve body, and the upper side and the lower side of the valve seat are respectively provided with the sealing surfaces matched with the valve clack for use, so that the valve seat can be quickly overhauled and detached, and different sealing surfaces on the valve seat can be switched to improve the utilization rate of the valve seat, and the service life of the valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of steam traps, in particular to a steam trap with a double sealing surface valve seat. Background Art

[0002] The steam trap is a safety control component in the boiler steam delivery system. It plays an important role. Therefore, the sealing performance, service life and maintenance convenience of the valve are very high. In order to improve the service life of the valve, a sealing surface that cooperates with the valve disc is provided on the upper side of the valve seat in the prior art to reduce the wear of the valve seat. However, due to the long-term and high-frequency opening and closing of the valve, the sealing surface of the valve seat will be severely worn, which affects the normal use of the valve and reduces the service life of the valve.

[0003] Therefore, it is urgent to design a steam trap structure that can increase the service life of the valve. Utility Model Content

[0004] The utility model aims to provide a steam trap with a double-sealing surface valve seat, which is detachably mounted in a valve body through the valve seat, and the upper and lower sides of the valve seat are respectively designed with sealing surfaces for use with a valve disc, so that the valve seat can be quickly inspected and disassembled, and different sealing surfaces on the valve seat can be switched to improve the utilization rate of the valve seat and the service life of the valve.

[0005] In order to solve the above technical problems, the utility model provides a steam trap with a double sealing surface valve seat, including a valve body and a valve seat, wherein the valve seat is detachably and sealingly installed in the valve body, and the valve seat is a vertically symmetrical structure and the upper and lower sides thereof respectively have sealing surfaces for use with the valve disc.

[0006] Furthermore, a sealing member is provided between the valve seat and the valve body.

[0007] Furthermore, a mounting seat is provided between the valve seat and the valve body. The mounting seat is located below the valve seat and has an annular notch on its outer side. The annular notch and the inner wall of the valve body together form a sealing groove. The sealing member is installed in the sealing groove, and the valve seat is against the sealing member.

[0008] Furthermore, the valve seat has an inner ring and an outer ring, the upper side of the outer ring has an upper protrusion protruding from the inner ring, the bottom of the flow equalizer is provided with an annular notch 2, and the upper protrusion extends into the annular notch 2.

[0009] Furthermore, the upper protrusion is gap-matched with the annular notch.

[0010] Furthermore, the lower side of the outer ring has a lower protrusion protruding from the inner ring, and the lower protrusion extends into the sealing groove to press the sealing member.

[0011] Furthermore, a flow balancing cover is provided above the valve seat, and the flow balancing cover is pressed on the upper side of the valve seat, so that the sealing member is respectively against the valve body and the valve seat.

[0012] Furthermore, the valve flap is located on the inner side of the flow balancing cover and a valve stem is passed through it, and packing and the flow balancing cover are arranged in sequence from top to bottom between the valve stem and the inner wall of the valve body, a pressure cover is provided above the packing and abuts against the flow balancing cover below, the pressure cover is installed on the valve body and its lower end extends into the valve body to press the packing.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model is installed in the valve body in a detachable manner by means of the valve seat, and the upper and lower sides of the valve seat are respectively provided with sealing surfaces designed to cooperate with the valve disc, so that the valve seat can be quickly inspected and disassembled, and different sealing surfaces on the valve seat can be switched to improve the utilization rate of the valve seat and the service life of the valve.

[0015] 2. The utility model improves the sealing performance of the valve and further increases the service life of the valve through the design of the sealing element.

[0016] 3. The utility model has an annular notch on the outer side of the mounting seat, and the annular notch and the inner wall of the valve body form a sealing groove together. The sealing member is installed in the sealing groove, and the valve seat and the sealing member are abutted against each other, so that the valve internals can be installed more tightly and the sealing effect of the valve is improved.

[0017] 4. The utility model adopts a design in which the upper protrusion of the valve seat extends into the second annular notch and cooperates with the gap of the second annular notch, and the lower protrusion extends into the sealing groove to press the seal and cooperates with the radial gap of the sealing groove. The pressing force of the gland is transmitted through the packing, the flow equalizing cover and the valve seat in sequence to act on the sealing ring. The sealing ring expands under the extrusion to achieve sealing. When the valve is closed, the valve disc further presses the valve seat, so that the extrusion pressure on the sealing ring is increased. The greater the extrusion force, the better the sealing effect.

[0018] 5. The utility model can be quickly positioned and easily installed by the cooperation between the upper protrusion and the annular notch and the cooperation between the lower protrusion and the sealing groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1Schematic diagram of a steam trap with a double sealing surface valve seat according to an embodiment of the utility model;

[0021] Figure 2 yes Figure 1 A magnified image of area A;

[0022] In the figure: 1-valve body, 2-valve seat, 3-seal, 4-flow equalizing cover, 5-mounting seat, 21-inner ring, 22-outer ring, 23-sealing surface, 221-upper protrusion, 222-lower protrusion, 7-valve stem, 8-packing, 9-pressure cover, 10-bracket. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings of the utility model specification to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In a specific embodiment of the present invention, Figure 1-2 As shown, a steam trap with a double sealing surface valve seat comprises a valve body 1 and a valve seat 2. The valve seat 2 is detachably sealed and installed in the valve body 1. The valve seat 2 is a vertically symmetrical structure and has sealing surfaces 23 for cooperating with a valve disc 6 on its upper and lower sides. When the sealing surface on the upper side is eroded and worn due to long-term use, the valve seat 2 is removed and the sealing surface on the lower side of the valve seat 2 in a standby state is installed upward into the valve body 1. The upper and lower sealing surfaces 23 are switched and used in conjunction with the corresponding sealing surfaces on the valve disc 6, thereby improving the utilization rate of the valve seat and the service life of the valve.

[0025] Specifically, a sealing member 3 is provided between the valve seat 2 and the valve body 1. In this embodiment, the sealing member 3 is a sealing ring; Figure 1 As shown, a flow balancing hood 4 is provided above the valve seat 2, and the flow balancing hood 4 is pressed on the upper side of the valve seat 2, so that the sealing member is respectively against the valve body 1 and the valve seat 2, the valve flap 6 is located on the inner side of the flow balancing hood 4 and a valve stem 7 is passed therethrough, and a packing 8 and a flow balancing hood 4 are provided between the valve stem 7 and the inner wall of the valve body 1 from top to bottom, a pressure cap 9 is provided above the packing 8 and is against the flow balancing hood 4 below, the pressure cap 9 is installed on the valve body 1 and its lower end extends into the valve body 1 to compress the packing 8, a bracket 10 is provided above the valve body 1, and the bracket 10 is fixed to the pressure cap 9. In this embodiment, the bracket 10 is threadedly connected to the valve body 1 and then fixed by welding, which improves the tightness of the valve during installation.

[0026] In addition, if Figure 1As shown, in this embodiment, a mounting seat 5 is further provided between the valve seat 2 and the valve body 1. The mounting seat 5 is located below the valve seat 2 and has an annular notch 1 on its outer side. The annular notch 1 and the inner wall of the valve body 1 together form a sealing groove. The sealing member 3 is installed in the sealing groove, and the valve seat 2 and the sealing member 3 are against each other.

[0027] like Figure 2 As shown, in this embodiment, the valve seat 2 has an inner ring 21 and an outer ring 22, the upper side of the outer ring 22 has an upper protrusion 221 protruding from the inner ring 21, and the outer side of the bottom of the flow balancing cover 4 is provided with an annular notch 2, and the upper protrusion 221 extends into the annular notch 2 and cooperates with the gap therein, which plays a certain positioning role for the flow balancing cover;

[0028] The lower side of the outer ring 22 has a lower protrusion 222 protruding from the inner ring 21. The lower protrusion 222 extends into the sealing groove to press the sealing member 3 and cooperates with the radial clearance of the sealing groove. This design can greatly improve the sealing effect of the valve.

[0029] The specific installation process of this embodiment is as follows:

[0030] First, place the sealing ring in the annular notch 1 of the mounting seat 5, and then place the mounting seat 5 in the corresponding mounting groove in the valve body 1, so that the outer wall of the sealing ring fits with the inner wall of the valve body 1, then place the valve seat 2 on the mounting seat 5, and the lower protrusion 222 extends into the sealing groove and presses on the sealing ring, then place the flow equalizing cover 4 on the valve seat 2, then connect the valve disc 6 with the valve stem 7 and pass it through the inside of the flow equalizing cover 4 so that its sealing surface cooperates with the sealing surface 23 on the upper side of the valve seat 2, then fill the packing 8 into the valve body 1, and the packing 8 is pressed on the flow equalizing cover 4, then fix the pressure cover 9 to the valve body 1 by bolts, and the lower end of the pressure cover 9 extends into the valve body 1 and presses on the packing 8, thereby finally completing the installation of the valve seat 2, and when the valve is closed, the sealing surface of the valve disc 6 cooperates with the sealing surface on the upper side of the valve seat 2. When the upper sealing surface of the valve seat 2 is worn, take out the gland 9, packing 8, flow equalizer 4 and valve seat 2 in turn, place the lower sealing surface of the valve seat 2 upward on the mounting seat 5, and the original upper protrusion 221 of the valve seat 2 extends into the sealing groove and presses on the sealing ring, then install the flow equalizer 4, packing 8 and gland 9 in turn to complete the installation of the valve seat 2.

[0031] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A steam trap with a double sealing surface valve seat, characterized in that: The invention comprises a valve body (1) and a valve seat (2), wherein the valve seat (2) is detachably and sealingly mounted in the valve body (1), and the valve seat (2) is a vertically symmetrical structure, and the upper and lower sides thereof respectively have sealing surfaces (23) for use with a valve flap (6).

2. A steam trap with a double sealing surface valve seat according to claim 1, characterized in that: A sealing member (3) is provided between the valve seat (2) and the valve body (1).

3. A steam trap with a double sealing surface valve seat according to claim 2, characterized in that: A mounting seat (5) is also provided between the valve seat (2) and the valve body (1). The mounting seat (5) is located below the valve seat (2) and has an annular notch on its outer side. The annular notch and the inner wall of the valve body (1) together form a sealing groove. The sealing member (3) is installed in the sealing groove. The valve seat (2) and the sealing member (3) are abutted against each other.

4. A steam trap with a double sealing surface valve seat according to claim 3, characterized in that: The valve seat (2) comprises an inner ring (21) and an outer ring (22); the upper side of the outer ring (22) comprises an upper protrusion (221) protruding from the inner ring (21); a flow balancing hood (4) is arranged above the valve seat (2); a second annular notch is arranged at the bottom of the flow balancing hood (4); and the upper protrusion (221) extends into the second annular notch.

5. A steam trap with a double sealing surface valve seat according to claim 4, characterized in that: The upper protrusion (221) is clearance-matched with the annular notch.

6. A steam trap with a double sealing surface valve seat according to claim 4, characterized in that: The lower side of the outer ring (22) has a lower protrusion (222) protruding from the inner ring (21), and the lower protrusion (222) extends into the sealing groove to press the sealing element (3).

7. A steam trap with a double sealing surface valve seat according to claim 4, characterized in that: The flow equalizing cover (4) is pressed against the upper side of the valve seat (2), so that the sealing element (3) abuts against the valve body (1) and the valve seat (2) respectively.

8. A steam trap with a double sealing surface valve seat according to claim 7, characterized in that: The valve flap (6) is located on the inner side of the flow equalizing cover (4) and a valve stem (7) is passed through it. A packing (8) and the flow equalizing cover (4) are arranged in sequence from top to bottom between the valve stem (7) and the inner wall of the valve body (1). A pressure cover (9) is arranged above the packing (8) and abuts against the flow equalizing cover (4) below. The pressure cover (9) is installed on the valve body (1) and its lower end extends into the valve body (1) to press the packing (8).

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