Pneumatic diaphragm regulating valve

Abstract

The utility model discloses a pneumatic diaphragm regulating valve, which relates to the technical field of valves, and comprises a valve body, a valve cover is arranged on the valve body, a valve seat, a valve core and a valve rod are arranged in the valve body, a regulating sleeve is arranged between the valve core and the valve body, the valve core is connected with the valve rod, the upper end of the valve rod extends out of the valve cover and is connected with a pneumatic diaphragm actuating mechanism, and the pneumatic diaphragm actuating mechanism is connected with the valve cover. The valve cover is detachably connected with a lower spring seat, an upper spring seat is arranged at the upper end of the valve rod, and an adjusting spring is arranged between the upper spring seat and the lower spring seat. After the adjusting spring is frequently adjusted and used for a long time and fails, replacement is convenient, the valve deck or the pneumatic film executing mechanism does not need to be opened during replacement, and the sealing reliability of the valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a pneumatic film regulating valve. Background Art

[0002] The pneumatic diaphragm regulating valve is a control device in the pneumatic unit combination instrument and is one of the important components in the automatic control system of the production process. The regulating valve consists of two parts: a pneumatic actuator and a regulating valve. The regulating spring of the existing pneumatic diaphragm regulating valve is usually set in the pneumatic diaphragm actuator or in the valve body. After frequent adjustment and long-term use, the regulating spring is prone to failure. To replace the regulating spring, the diaphragm cover or valve cover of the pneumatic diaphragm actuator needs to be opened, which affects the reliability of the valve seal. Summary of the invention

[0003] In view of the deficiencies in the prior art, the utility model provides a pneumatic diaphragm regulating valve.

[0004] The technical solution provided by the utility model is:

[0005] A pneumatic diaphragm regulating valve comprises a valve body, a valve cover is provided on the valve body, a valve seat, a valve core and a valve stem are provided in the valve body, an adjusting sleeve is provided between the valve core and the valve body, the valve core is connected to the valve stem, the valve cover extends from the upper end of the valve stem and is connected to a pneumatic diaphragm actuator, the valve cover is detachably connected to a lower spring seat, an upper spring seat is provided at the upper end of the valve stem, and an adjusting spring is provided between the upper spring seat and the lower spring seat.

[0006] The outer side of the valve cover is provided with threads, and the lower spring seat is connected to the outer side of the valve cover through threads.

[0007] A gland is provided at the upper end of the valve cover, a sealing gasket is provided between the gland and the valve cover, and a sealing ring is provided between the gland and the valve stem.

[0008] The pneumatic film actuator comprises a tray, a diaphragm and a push rod. The upper end of the push rod is connected to the tray, and the lower end is connected to the valve stem. The upper end of the tray presses against the diaphragm.

[0009] A support plate is provided at the lower end of the pneumatic diaphragm actuator, the support plate is connected to the valve cover through a support rod, and a cushion block is provided between the pneumatic diaphragm actuator and the support plate.

[0010] The valve seat comprises a first sealing surface and a second sealing surface. The lower end of the valve core is provided with an annular groove, in which a rubber sealing ring is provided. The lower end surface of the valve core and the first sealing surface form a first sealing pair, and the rubber sealing ring and the second sealing surface form a second sealing pair.

[0011] The first sealing pair is a planar hard seal.

[0012] The second sealing pair is a sloped soft seal.

[0013] The beneficial effects of the utility model are as follows: the utility model has a lower spring seat detachably connected to the valve cover, an upper spring seat is arranged on the upper end of the valve stem, and the adjusting spring is arranged between the upper spring seat and the lower spring seat. After the adjusting spring fails due to frequent adjustment and long-term use, it is convenient to replace it. When replacing, there is no need to open the valve cover or the pneumatic diaphragm actuator, thereby ensuring the reliability of the valve sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of an embodiment of the utility model;

[0015] Figure 2 for Figure 1 A partial enlarged view of . DETAILED DESCRIPTION

[0016] The embodiments of the present utility model will be further described below in conjunction with the accompanying drawings.

[0017] like Figure 1 As shown, a pneumatic diaphragm regulating valve comprises a valve body 1, a valve cover 6 is arranged on the valve body 1, a valve seat 2, a valve core 3, and a valve stem 5 are arranged in the valve body 1, an adjusting sleeve 4 is arranged between the valve core 3 and the valve body 1, the valve core 3 is U-shaped, the lower end of the valve core 3 is connected to the valve stem 5, the upper end of the valve stem 5 extends out of the valve cover 6 and is connected to the pneumatic diaphragm actuator, the pneumatic diaphragm actuator comprises a diaphragm cover 19, a tray 17, a diaphragm 18, and a push rod 16, the upper end of the push rod 16 is connected to the tray 17, and the lower end is connected to the valve stem 5, the upper end of the tray 17 presses the diaphragm 18, and the upper end of the diaphragm cover 19 is connected to the air source so as to drive the tray 17 to move up and down, thereby driving the valve stem 5 to move up and down to control the valve core 3. A support plate 13 is arranged at the lower end of the pneumatic diaphragm actuator, the support plate 13 is connected to the valve cover 6 through the support rod 9, and a cushion block 14 is arranged between the pneumatic diaphragm actuator and the support plate 13, and the support plate 13 and the cushion block 14 play a supporting role for the pneumatic diaphragm actuator to ensure its stability during operation.

[0018] In this embodiment, the valve cover 6 is detachably connected to the lower spring seat 7, the outer side of the valve cover 6 is provided with a thread, the lower spring seat 7 is connected to the outer side of the valve cover 6 by thread, the upper end of the valve stem 5 is provided with an upper spring seat 11, the upper spring seat 11 is also connected to the outer side of the valve stem 5 by thread, and an adjusting spring 8 is provided between the upper spring seat 11 and the lower spring seat 7. When the adjusting spring 8 fails due to frequent adjustment of the valve and long-term use, it is convenient to replace it. When replacing, there is no need to open the valve cover or the pneumatic diaphragm actuator. It is only necessary to separate the valve stem 5 from the push rod 16 and the upper spring seat 11 from the valve stem before replacement.

[0019] In this embodiment, a gland 10 is provided at the upper end of the valve cover 6, a sealing gasket is provided between the gland 10 and the valve cover 6, and a sealing ring is provided between the gland 10 and the valve stem 5 to prevent the medium from leaking from the upper end of the valve cover 6 and ensure the reliability of the valve sealing.

[0020] like Figure 2 As shown, the valve seat 2 includes a first sealing surface 21 and a second sealing surface 22, a ring groove 31 is provided at the lower end of the valve core 3, a rubber sealing ring 32 is provided in the ring groove 31, the lower end surface of the valve core 3 and the first sealing surface 21 form a first sealing pair, the first sealing pair is a plane hard seal, the rubber sealing ring 32 and the second sealing surface 22 form a second sealing pair, and the second sealing pair is an inclined soft seal. By setting a soft and hard double seal, the sealing effect is good and suitable for high-pressure scenarios.

[0021] The embodiments should not be regarded as limiting the present invention, and any non-creative improvements made based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. A pneumatic diaphragm regulating valve, comprising a valve body, a valve cover is arranged on the valve body, a valve seat, a valve core and a valve stem are arranged in the valve body, an adjusting sleeve is arranged between the valve core and the valve body, the valve core is connected to the valve stem, the upper end of the valve stem extends out of the valve cover and is connected to the pneumatic diaphragm actuator, characterized in that: The valve cover is detachably connected with a lower spring seat, an upper spring seat is arranged at the upper end of the valve stem, and an adjusting spring is arranged between the upper spring seat and the lower spring seat.

2. A pneumatic diaphragm regulating valve according to claim 1, characterized in that: The outer side of the valve cover is provided with threads, and the lower spring seat is connected to the outer side of the valve cover through threads.

3. The pneumatic diaphragm regulating valve according to claim 1, characterized in that: A gland is provided at the upper end of the valve cover, a sealing gasket is provided between the gland and the valve cover, and a sealing ring is provided between the gland and the valve stem.

4. The pneumatic diaphragm regulating valve according to claim 1, characterized in that: The pneumatic film actuator comprises a tray, a diaphragm and a push rod. The upper end of the push rod is connected to the tray, and the lower end is connected to the valve stem. The upper end of the tray presses against the diaphragm.

5. The pneumatic diaphragm regulating valve according to claim 4, characterized in that: A support plate is provided at the lower end of the pneumatic diaphragm actuator, the support plate is connected to the valve cover through a support rod, and a cushion block is provided between the pneumatic diaphragm actuator and the support plate.

6. The pneumatic diaphragm regulating valve according to claim 1, characterized in that: The valve seat comprises a first sealing surface and a second sealing surface. The lower end of the valve core is provided with an annular groove, in which a rubber sealing ring is provided. The lower end surface of the valve core and the first sealing surface form a first sealing pair, and the rubber sealing ring and the second sealing surface form a second sealing pair.

7. The pneumatic diaphragm regulating valve according to claim 6, characterized in that: The first sealing pair is a planar hard seal.

8. The pneumatic diaphragm regulating valve according to claim 6, characterized in that: The second sealing pair is a sloped soft seal.

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