High-temperature and high-pressure special adjusting valve

Abstract

The invention discloses a high temperature and high pressure special regulating valve, which comprises a valve body, a valve cover, a valve seat, a valve cage, a valve plug and a valve stem. A built-in space, a valve seat is provided at the lower part of the built-in space; a valve cage is provided between the valve seat and the bonnet, and the valve cage includes an upper valve cage and a lower valve cage arranged from top to bottom, the upper valve cage and the lower valve cage There is an upper seal between them; there is a valve plug inside the cage, the valve plug is set above the valve seat, and a lower seal is provided between the valve plug and the valve seat; there is a valve stem inside the valve plug, the valve plug and The valve stems are connected by pre-positioning and anti-loosening threads. The upper part of the valve stem is installed in the center of the bonnet. There is a graphite packing between the valve stem and the bonnet. The high-temperature and high-pressure special regulating valve of the present invention can effectively improve the sealing performance of the valve at high temperature, withstand high pressure, reliability and versatility; it can be widely used in various automatic high-temperature and high-pressure regulating occasions.

Description

technical field [0001] The invention relates to the technical field of automatic control, in particular to a high-temperature and high-pressure special regulating valve capable of controlling flow, temperature and pressure, with good sealing performance, high reliability and durability. Background technique [0002] In industrial automation control, regulating valves are often used to control flow, temperature and pressure. Existing regulating valve, its structure is as attached figure 1 As shown, it includes valve body (01), valve cover (02), valve seat (03), valve core (04), sleeve (05), balance seal ring (06), valve stem (07), packing group (08), gland (09), dustproof ring (010). Such structures have the following disadvantages: [0003] 1. The valve seat (03) and the valve core are sealed in two places, one is a metal seal and the other is a soft seal. Since the soft seal is made of plastic products, its elasticity is poor and it cannot withstand high temperatures. Th...

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Problems solved by technology

[0004] 2. The inner wall of the valve core (04) is too thin. When it encounters high temperature, the principle of thermal expansion is easy to deform at high temperature, and it is easy to leak with the metal seal of the bottom valve seat, and it is easy to lock with the sleeve (05), which affects the performance;

[0006] 4. After the valve stem (07) and the valve core (04) are connected to the thread, they are welded, which cannot be replaced online, and the maintenance of the equipment is troublesome;

[0007] 5. The packing group (08) is short in combination, the relative distance of the seal is relatively shortened, and it is far away from the valve core, so it cannot guide the valve core;

[0009] In short, as far as the conventional regulating valve at room temperature is concerned, due to insufficient standardization and modularization, its operating temperature is low and the pressure difference is low; The problems of low differential and high friction, and its environmental applicability, low reliability, and durability

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