Torque testing tool for polish rod gate valve

Abstract

The invention relates to a polished rod gate valve torque testing tool which comprises a valve flange connecting disc, a gland flange, a nut, a stud, a sleeve, a torque wrench, a valve rod nut and a valve rod. The valve rod is installed in the center of the valve flange connecting disc, and the upper end of the valve flange connecting disc is fixedly connected with the gland flange through the nut and the stud; the center of the gland flange is rotationally connected with a valve rod nut, the upper end of the valve rod nut penetrates through the gland flange, the top end of the valve rod nut is sleeved with a sleeve, and a torque wrench is inserted into the top end of the sleeve. The novel structure is adopted, the gland flange, the valve rod nut and the sleeve are arranged on the valve flange connecting disc, the torque wrench can measure the torque of the polish rod gate valve easily and conveniently, and the device is simple and reasonable in structure, convenient to install and use, low in manufacturing cost and suitable for application and popularization.

Description

Technical Field

[0001] The invention relates to a polished stem gate valve testing tool, in particular to a polished stem gate valve torque testing tool. Background Art

[0002] As one of the most common valves, wedge gate valves are widely used in the fields of petroleum, chemical industry, power station, etc. The gate valve is operated by handwheel, gearbox, electric, pneumatic and other devices. When using electric, pneumatic and other actuators, customers usually equip these operating devices by themselves. Valve manufacturers only need to provide bare stem valves without actuators. However, customers will require the torque of the valve to be tested before leaving the factory so that they can choose the appropriate actuator. The valve stem movement of the gate valve is lifting and lowering, which cannot be directly measured using a torque wrench. For this reason, we propose a torque test tool for bare stem gate valves. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a torque test tool for a polished-stem gate valve, which solves the problem that the valve stem movement of the existing gate valve is lifting and lowering and cannot be directly measured using a torque wrench.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a torque testing tool for a bare stem gate valve, comprising a valve flange disc, a gland flange, nuts, studs, a sleeve, a torque wrench, a valve stem nut and a valve stem, a valve stem is installed at the center of the valve flange disc, the upper end of the valve flange disc is fixedly connected to the gland flange by nuts and studs, the center of the gland flange is rotatably connected to the valve stem nut, the upper end of the valve stem nut passes through the gland flange, and a sleeve is sleeved on the top end of the valve stem nut, and a torque wrench is plugged on the top end of the sleeve.

[0005] Based on the above solution, the sleeve and the valve stem nut are movably plugged in, and a hexagonal step and a hexagonal hole are provided at the connection.

[0006] Based on the above solution, the valve stem nut and the valve stem are connected by threads.

[0007] Based on the above solution, the valve stem nut is provided with a step inside the gland flange, and thrust pads are respectively installed at the upper and lower ends of the step.

[0008] Compared with the prior art, the present invention has the following beneficial effects: the torque testing tool for the smooth-stem gate valve adopts a new structure, in which a gland flange, a stem nut and a sleeve are arranged on the valve flange connection plate, so that a torque wrench can be used to measure the torque of the smooth-stem gate valve, which is simple and convenient. The present invention has a simple and reasonable structure, is easy to install and use, has a low manufacturing cost, and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1The state diagram after the torque test fixture is installed for the smooth stem gate valve; Figure 2 It is a structural schematic diagram of the torque testing tool for a polished stem gate valve of the present invention.

[0010] The numbers in the figure are: 1-valve flange connection plate, 2-cover flange, 3-nut, 4-stud, 5-sleeve, 6-torque wrench, 7-stem nut, 8-thrust pad, 9-stem. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0012] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0013] Reference Figure 1 to Figure 2 It can be seen that the torque testing tooling for the bare stem gate valve includes a valve flange connection plate 1, a gland flange 2, a nut 3, a stud 4, a sleeve 5, a torque wrench 6, a stem nut 7 and a valve stem 9. A valve stem 9 (the existing mature structure of a bare stem gate valve) is installed at the center of the valve flange connection plate 1. The upper end of the valve flange connection plate 1 is fixedly connected to the gland flange 2 through the nut 3 and the stud 4. The center of the gland flange 2 is rotatably connected to the stem nut 7. The upper end of the stem nut 7 passes through the gland flange 2, and a sleeve 5 is sleeved and installed on the top end of the stem nut 7. A torque wrench 6 is plugged and installed on the top end of the sleeve 5. The torque wrench 6 can measure the torque of the bare stem gate valve.

[0014] The sleeve 5 and the valve stem nut 7 are movably plug-in, and a hexagonal step and a hexagonal hole are provided at the connection. The hexagonal step and the hexagonal hole can enable the sleeve 5 to drive the valve stem nut 7 to rotate; the valve stem nut 7 and the valve stem 9 are connected by a thread. When the valve stem nut 7 rotates, the valve stem 9 can be driven to move up and down under the action of the thread. The valve stem nut 7 is provided with a step in the gland flange 2, and thrust pads 8 are respectively installed at the upper and lower ends of the step. The thrust pad 8 can reduce the friction force when the valve stem nut 7 rotates, so that the valve stem nut 7 can be easily rotated in the gland flange 2.

[0015] Principles and advantages of the present invention: When using the torque testing tool for a bare stem gate valve, first install the valve stem nut 7 in the gland flange 2, and install the thrust pad 8, then install the valve stem nut 7 on the valve stem 9 through the thread, and then fix the gland flange 2 to the valve flange connection plate 1 through the stud 4 and the nut 3, then insert the sleeve 5 on the valve stem nut 7, and finally insert the head of the torque wrench 6 into the upper end of the sleeve 5, use the torque wrench 6 to close the valve until the valve does not leak, and read the value of the torque wrench 6 at this time as the measured closing torque. The present invention has a simple and reasonable structure, is easy to install and use, has a low manufacturing cost, and is suitable for popularization and use.

[0016] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A torque test tool for a smooth stem gate valve, comprising a valve flange adapter (1), a gland flange (2), a nut (3), a stud (4), a sleeve (5), a torque wrench (6), a valve stem nut (7) and a valve stem (9), characterized in that: A valve stem (9) is installed at the center of the valve flange connection plate (1); the upper end of the valve flange connection plate (1) is fixedly connected to a gland flange (2) via a nut (3) and a stud (4); the center of the gland flange (2) is rotatably connected to a valve stem nut (7); the upper end of the valve stem nut (7) passes through the gland flange (2); a sleeve (5) is sleeved and installed at the top end of the valve stem nut (7); and a torque wrench (6) is plugged and installed at the top end of the sleeve (5).

2. The polished gate valve torque test fixture according to claim 1, characterized in that: The sleeve (5) and the valve stem nut (7) are movably plugged in, and a hexagonal step and a hexagonal hole are provided at the connection.

3. The torque test fixture for polished gate valve according to claim 1, characterized in that: The valve stem nut (7) and the valve stem (9) are connected via threads.

4. The torque test fixture for polished gate valve according to claim 1, characterized in that: The valve stem nut (7) is provided with a step inside the gland flange (2), and thrust pads (8) are respectively installed at the upper and lower ends of the step.

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