A high-pressure water pump outlet control valve

Abstract

The invention relates to a high-pressure water pump outlet control valve. According to the adopted technical scheme, the high-pressure water pump outlet control valve comprises an electric actuating mechanism, a first abrasion-resistant sleeve, a first radial ball bearing, a valve deck, a first sealing piece, an upper valve rod, a valve body, a valve element, a second sealing piece, a lower valverod, a second abrasion-resistant sleeve, a second radial ball bearing, a supporting end cover and a backflow pore plate. The high-pressure water pump outlet control valve has the characteristics of pump starting with lowest flow, accurate pre-charging positioning, adjustable pre-charging pressure, large flow coefficient during full-bore starting, convenient overhauling due to the outside arrangement mode of the backflow pore plate, zero leakage during backflow and low valve manufacturing cost, and is particularly suitable for delayed coking device hydraulic decoking systems with high pressure,high flow, excellent sealing performance and accurate remote control.

Description

technical field [0001] The invention belongs to the field of control valves and relates to a high-pressure water pump outlet control valve. Background technique [0002] The high-pressure water pump outlet control valve (i.e. decoking control valve) is a special valve for the hydraulic decoking system of the delayed coking device in the petrochemical industry. It is installed on the outlet pipeline of the high-pressure water pump to control the flow direction of the high-pressure water. Charge and fully open three working conditions. The role of the decoking control valve is to start the high-pressure water pump at the minimum flow rate, avoid frequent pump start-ups, and impact the power grid. At the same time, pre-fill the pipeline with low pressure and low flow rate to avoid water hammer and damage pipelines and equipment. Generally, a double-acting cylinder is used as the actuator to control the three working states of the valve, namely, the return position, the pre-fil...

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Problems solved by technology

Generally, a double-acting cylinder is used as the actuator to control the three working states of the valve, namely, the return position, the pre-fill position and the full-open position. The main problem is that the positioning of the pre-fill position is not accurate, resulting in unstable pre-charge pressure; Since the pre-filled decompression orifice and the side flow decompression orifice are located inside the valve body, under the action of high-pressure water, the decompression orifice is easy to wear and rust, resulting in changes in the parameters of the high-pressure water flow, and if the decompression orifice is replaced, it will It needs to be disassembled together with the equipment on the upper part of the valve, and the entire valve body needs to be disassembled for maintenance, which increases the difficulty and cost of maintenance; only the upper end of the valve core is provided with a valve stem to ensure that the valve core is concentric with the upper sleeve and the lower sleeve. Under the action of water, the valve core will deflect and the centering is unreliable. When the valve core moves up and down, the friction between the upper sleeve and the lower sleeve is relatively large, and the service life of the parts is short; the pre-charge pressure cannot be changed. If the pump pressure increases , the pre-charge pressure will increase correspondingly, which will easily lead to failure of vulnerable parts due to high-pressure flushing

These two methods cannot realize the adjustable pre-charge pressure of the control valve

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