High-temperature and high-pressure special adjusting valve

Abstract

The invention discloses a high-temperature and high-pressure special adjusting valve. The high-temperature and high-pressure special adjusting valve comprises a valve body, a valve cover, a valve seat, a valve cage, a valve plug and a valve rod. The valve cover is arranged above the valve body. An inner space is formed between the valve cover and the valve body, and the valve seat is arranged at the lower portion of the inner space. The valve cage is arranged between the valve seat and the valve cover and comprises an upper valve cage body and a lower valve cage body which are arranged from top to bottom. An upper sealing piece is arranged between the upper valve cage body and the lower valve cage body. The valve plug is arranged in the valve cage. The valve plug is arranged above the valve seat, and a lower sealing piece is arranged between the valve plug and the valve seat. The valve rod is arranged in the valve plug. The valve plug and the valve rod are connected through a front positioning anti-loosening thread. The upper portion of the valve rod penetrates the center of the valve cover, graphite filler is arranged between the valve rod and the valve deck, and a filler gland is further arranged at the upper portion of the valve cover. According to the high-temperature and high-pressure special adjusting valve, the high-temperature sealing performance, high-pressure bearing, reliability and universality of the valve can be effectively improved, and the high-temperature and high-pressure special adjusting valve can be widely applied to various automatic high-temperature and high-pressure adjusting 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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