Ultrahigh pressure high-temperature needle valve

Abstract

The invention discloses an ultrahigh pressure high-temperature needle valve which mainly comprises a valve body, a valve needle rod, a roll ball, a threaded rod, a handle, a fluid inflow channel, a fluid outflow channel and a sealing ring. The handle (7) is connected with the threaded rod (4), an I-shaped groove (10) is machined in the lower end of the threaded rod, a vertical hole (11) is formed in the valve body (1), the valve needle rod (2) of a clamping and guiding type is arranged in the vertical rod and is clamped into the I-shaped groove (10) of the threaded rod, the roll ball (3) is embedded between the valve needle rod (2) and the I-shaped groove (10) of the threaded rod, the sealing ring (8) is arranged between the valve needle rod and the vertical hole, a trapezoid pad (12) is arranged on the upper portion of the sealing ring, a valve needle point (14) and the valve body (1) are in metal hard sealing, and the valve body (1) is provided with the fluid inflow channel (5) and the fluid outflow channel (6). The ultrahigh pressure high-temperature needle valve can be applied to ultrahigh pressure experiment conditions, a valve needle is flexible in opening and closing, no rotary friction exists in the sealing cone of the valve body, the valve needle rod and the threaded rod are independent of each other, machining difficulty is reduced, the valve needle rod is convenient to replace after being abraded, and materials are saved.

Description

technical field [0001] The invention relates to a control part for fluid entry and exit in experimental equipment, in particular to an ultra-high pressure and high temperature needle valve, which is mainly used for opening and blocking the passage of experimental samples. Background technique [0002] In various high-temperature and high-pressure fluid experimental instruments and equipment in the field of petrochemical industry, in order to study the physical parameters of reservoir rocks or the flow characteristics of reservoir fluids, various needle valves are used to quantitatively control various input or output fluids. The valve is the key to this quantitative control of on and off throughout the experimental procedure. There are many types of needle valves in use at present. The needle rods of foreign needle valves are slender and high-precision, but the processing is difficult, which wastes materials, and it is difficult to replace the needle rods after they are worn...

AI Technical Summary

Problems solved by technology

There are many types of needle valves currently in use. The needle rods of foreign needle valves are slender and high-precision, but the processing is difficult and wastes materials, and it is difficult to replace the needle rods after they are worn out.

The needle rod and screw rod of domestic needle valves are mostly processed and manufactured as a whole. When the screw rod rotates, the valve needle rod as a whole also rotates, and the valve needle tip and the valve body cone sealing angle produce heavy friction, which is easy to cause the sealing cone surface of the valve needle to be damaged. Expansion, reducing the service life of the valve needle

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