Pressure reducing valve and temperature-reducing and pressure-reducing device

Abstract

The invention provides a pressure reducing valve and a temperature-reducing and pressure-reducing device. The pressure reducing valve comprises a valve body, valve seats, a valve flap and a valve rod and also comprises a guide cover, wherein the valve seats are fixedly connected with the valve body; the valve flap moves in the valve seat to change the flow areas of the valve seats; the valve rod is connected with the valve flap; the guide cover is sheathed on the valve flap; the two ends of the guide cover abut against the inner wall of the valve body; the guide cover is provided with a flow guiding hole, and is sheathed on the valve flap; the two ends of the guide cover abut against the inner wall of the valve body respectively; and the actuating mechanism drives the valve rod connected with the actuating mechanism to move and further drive the valve flap to move in the valve seats and the guide cover. The invention has the advantages that the radial movement of the valve flap is effectively limited by adopting a mode that the guide cover is sheathed on the valve flap, the valve flap finishes the axial movement better, and the unnecessary radial movement of the valve flap is limited, so that the vibration of the valve flap is reduced, and further the noise is reduced to enable the working environment to be quiet; and steam flowing out of the valve seats flows out of the flow guiding hole arranged in a guide sleeve, is guided out of the flow guiding hole, and is also throttled simultaneously, so that the action of secondary pressure reduction is achieved.

Description

technical field [0001] The invention relates to the technical field of boilers, more specifically, to a pressure reducing valve and a temperature and pressure reduction device. Background technique [0002] Large-capacity, high-parameter, diversified and automated boilers are used in industrial fields such as coal-to-oil and thermal power units. The steam generated by the boiler needs to be treated by a temperature and pressure reduction device to meet the requirements of the process system. The core component of the temperature and pressure reduction device is the pressure reducing valve. The traditional pressure reducing valve includes valve body 1, valve seat 2, valve disc 3, round pin 4 and valve stem 5 and other components. The traditional pressure reducing valve relies on the actuator to drive the movement of the valve stem 5 connected to it. The valve stem 5 drives the valve disc 3 fixedly linked to it through the round pin 4 to move in the valve seat 2, and the valve...

AI Technical Summary

Problems solved by technology

When the traditional pressure reducing valve completes the opening and closing action, it relies on the actuator to provide power. When the actuator provides power, it will produce a certain vibration, which will cause the valve stem 5 connected to the actuator to generate vibration in its radial direction. Unnecessary movement, when the valve stem 5 moves radially upwards, it collides with its surrounding parts, resulting in high noise generation

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