Stroke limiting device of regulating valve

Abstract

The utility model provides a regulating valve stroke limiting device which comprises a screw cap, an O-shaped sealing ring, a limiting rod, a limiting nut, a hexagon nut and a regulating valve body, the screw cap is arranged at the position of a membrane cover of the regulating valve body through internal threads, and the bottom of the limiting rod is connected with a push rod of the regulating valve body. The top of the limiting rod is in threaded connection with a limiting nut through an external thread, and the top end of the limiting nut is in threaded fastening connection with a hexagon nut. The installation space is reduced, and the cost of the limiting device is reduced; meanwhile, operation is convenient, the stroke position can be adjusted before installation, and direct use can be achieved after installation; after installation, if the stroke changes, adjustment is convenient, and the device does not need to be detached.

Description

Technical Field

[0001] The utility model belongs to the technical field of limit devices and relates to a travel limit device for a regulating valve. Background Art

[0002] Control valves are actuators in automated instrumentation and terminal components in process control. With the continuous advancement of automation, control valves are widely used in various industries, including petroleum, chemical, textile, electric power, metallurgy, food, and pharmaceuticals. Control valves are a special type of valve that combines the throttling or shutoff functions of conventional valves with the regulation function of automatic control. However, due to operating conditions and on-site anti-static and explosion-proof requirements, they cannot use electricity as a power source to drive normal limit devices such as limit switches and positioners. Therefore, purely mechanical limit devices are used to meet the equipment's operating requirements.

[0003] The handwheel boxes or manual mechanisms commonly used now take up a lot of space and are relatively expensive. Some products are placed on top of the pneumatic actuator, which is relatively high and inconvenient to operate. Summary of the Invention

[0004] The purpose of the present utility model is to provide a travel limit device for a regulating valve to solve the problems raised in the above background technology.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a regulating valve stroke limit device, including a screw cover, an O-ring, a limit rod, a limit nut, a hexagonal nut and a regulating valve body, the screw cover is arranged on the membrane cover of the regulating valve body through an internal thread, the bottom of the limit rod is connected to the push rod of the regulating valve body, the top of the limit rod is threadedly connected to the limit nut through an external thread, and the top of the limit nut is threadedly fastened to the hexagonal nut.

[0006] In the above-mentioned regulating valve stroke limiting device, the O-ring is embedded in the interior of the screw cover and is cooperatively connected with the limiting rod.

[0007] In the above-mentioned regulating valve stroke limiting device, the bottom of the limiting rod is provided with an internal thread section, and the bottom of the limiting rod is threadedly assembled with the push rod of the regulating valve body through the internal thread section.

[0008] Compared with the existing technology, the advantages of the stroke limit device of the regulating valve of the utility model are: reducing the installation space and reducing the cost of the limit device; at the same time, it is easy to operate, the stroke position can be adjusted before installation, and it can be used directly after installation; if there is a stroke change after installation, it is easy to adjust without disassembling the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a structural schematic diagram of a travel limit device of a regulating valve of the utility model.

[0010] In the figure, 1. Screw cap; 2. O-ring; 3. Limit rod; 4. Limit nut; 5. Hexagonal nut; 6. Regulating valve body. DETAILED DESCRIPTION

[0011] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0012] like Figure 1 As shown, the utility model is a regulating valve stroke limit device, including a screw cover 1, an O-ring 2, a limit rod 3, a limit nut 4, a hexagonal nut 5 and a regulating valve body 6. The screw cover 1 is arranged on the membrane cover of the regulating valve body 6 through an internal thread, the bottom of the limit rod 3 is connected to the push rod of the regulating valve body 6, the top of the limit rod 3 is threadedly connected to the limit nut 4 through an external thread, and the top of the limit nut 4 is threadedly fastened to the hexagonal nut 5.

[0013] Furthermore, in order to improve the sealing performance, the O-ring 2 is embedded in the screw cover 1 and is connected with the limiting rod 3.

[0014] Furthermore, in order to ensure good connection firmness, the bottom of the limiting rod 3 is provided with an internal thread section, and the bottom of the limiting rod 3 is assembled with the push rod thread of the regulating valve body 6 through the internal thread section.

[0015] It consists of 1-screw cover, 2-O-type sealing ring, 3-limiting rod, 4-limiting nut and 5-hexagonal nut, and is characterized in that the 1-screw cover is connected to the actuator membrane cover through an internal thread and is fixed to the upper end of the actuator membrane cover. The 2-O-type sealing ring is embedded in the 1-screw cover and cooperates with the 3-limiting rod. The bottom of the 3-limiting rod is connected to the top of the actuator push rod through an internal thread. The upper part of the 3-limiting rod is connected to the 4-limiting nut through an external thread, and the 5-hexagonal nut is tightly closed on the top of the 4-limiting nut.

[0016] By using the original actuator components, the use of components is reduced, space is saved, and costs are saved; the position of the limit nut can be adjusted according to the stroke requirements, which is easy to use.

[0017] Matters not described in detail in this specification constitute prior art known to those skilled in the art. The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art to which the present invention relates may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A regulating valve stroke limit device, comprising a screw cap (1), an O-ring (2), a limit rod (3), a limit nut (4), a hexagonal nut (5) and a regulating valve body (6), characterized in that: The screw cover (1) is arranged on the membrane cover of the regulating valve body (6) through an internal thread, the bottom of the limiting rod (3) is connected to the push rod of the regulating valve body (6), the top of the limiting rod (3) is threadedly connected to the limiting nut (4) through an external thread, and the top of the limiting nut (4) is threadedly fastened to the hexagonal nut (5).

2. A regulating valve stroke limiter according to claim 1, characterized in that: The O-type sealing ring (2) is embedded in the interior of the screw cover (1) and is connected in cooperation with the limiting rod (3).

3. A regulating valve stroke limiting device according to claim 1, characterized in that: The bottom of the limiting rod (3) is provided with an internal thread section, and the bottom of the limiting rod (3) is assembled with the push rod thread of the regulating valve body (6) through the internal thread section.

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