High inlet valve, high outlet valve (high check valve)
Valve name: high inlet three-way valve, high outlet valve
Valve model: Angle type: J764Y-200C DN175 H62Y-200C DN175
Straight-through: J761Y-200C DN225 H61Y-200C DN225
Valve material: WCB
，当高加泄漏或者水位超过高三水位时为了防止倒流快速切断高加，正常投运时给水走主路，当切断时给水走小旁路。 The high-pressure joint valve is a three-way or four-way valve with a high inlet . When the high -pressure gas leaks or the water level exceeds the high-level water level, in order to prevent reverse flow, the high -pressure water supply is quickly cut off. bypass. The joint valve is basically hydraulically controlled. The control mechanism is a copper piston. The piston is divided into two water chambers. Under normal operating conditions, there is a long flow of water on the upper part of the piston, which flows through the through hole on the piston to the lower water chamber to discharge the water. It plays the role of lubrication to prevent jamming. When an accident occurs, the upper part of the water chamber is quickly filled with water. When the pressure reaches 0.78 MPa, the valve is activated, and the filled water is mainly condensed water. Generally, the condensed water is divided into four channels, two One solenoid valve, one bypass, one throttle orifice plate. The valve body is mainly divided into two layers, both of which are self-sealing structures. The upper floor is a small bypass, and the lower road is a high road. The water supply direction is adjusted by two sealing surfaces.
是高压加热器配备的自动保护装置，以保证在高加管系发生泄漏，或疏水调整门卡死等异常情况时，由此阀门自动关闭向高加管系通水而打开旁路通水，由于高压加热器为了要切断给水，所以设计一套水侧的保护阀门，高加联成阀的称呼是指一套阀门所以称为联成阀，有入口连成阀及出口联成阀之分。 Gaoka joint valve is an automatic protection device equipped with high-pressure heater, to ensure that when the Gaoka piping system leaks, or the hydrophobic adjustment door is stuck and other abnormal conditions, the valve automatically closes to the Gauca piping system to open water. Bypass water. Because the high-pressure heater is to cut off the water supply, a set of protection valves on the water side is designed. The name of the high-pressure joint valve refers to a set of valves, so it is called a joint valve. There is an inlet valve and an outlet. The points of the joint valve. 设计为电动闸阀居多。 The high-joint joint valve is also commonly referred to as the feedwater three-way valve. The three-way valve is divided into electric and hydraulic. Generally, the units with more than 300,000 are called the most because the high-side water outlet valve is designed as an electric gate valve.
（也叫止回阀）。 All high-pressure combined valves are hydraulic pressure valves, which rely on water supply for power. When necessary, close the combined valve to cut off the water supply, and the small combined bypass pipe (two) exits the combined valve (also called check valve). The check valve is closed under the action of the small bypass water, and the feed water flows to the boiler through the check valve to prevent the boiler from being cut off and protect the high-pressure heater. The design of this valve is relatively unique. It is divided into upper valve seat and lower valve seat. When the valve is opened and the feed water enters the high temperature, the valve core and the upper valve seat contact and seal to ensure that the feed water does not go through the small bypass; when the valve is closed, the feed water goes through When bypassing into the boiler, the valve core is in contact with the lower valve seat and sealed to ensure that the high temperature can be disassembled and repaired.
Hydraulically controlled four-way valve, the feed water is introduced from the side inlet, and the high-pressure heater is introduced from the downward outlet. Two outlets above the valve are connected to the bypass pipeline. The valve has two upper and lower sealing surfaces. During normal operation of high and high pressure, the valve automatically opens by the pressure difference acting on the cross section of the valve, the valve moves up, contacts the upper seal, and the bypass is cut off. When the piping of the high-pressure heater is broken and the water level exceeds the allowable water level, the water level signal opens the quick opening and closing valve through the electrical device, the condensed water enters the upper part of the hydraulic cylinder, pushes the piston, the valve flap moves down and then quickly closes the valve. The two bypass pipes directly enter the boiler, so that the high-strength train is separated and the unit is protected for safe operation.
The valve has two valve seats, Stellite alloy is welded on the sealing surface , the lower valve seat is directly welded to the valve body, and the upper valve seat and the valve body adopt a double-channel self-sealing structure to ensure the normal operation and long-term operation of the valve. No leakage
）、出口阀（ 出口止回阀 ）系列产品分别用于50MW-600MW锅炉高压加热器进口和出口处，作为高加的保护阀门。 The series of inlet valve ( inlet valve ) and outlet valve ( outlet check valve ) for high-pressure feedwater heaters are used at the inlet and outlet of 50MW-600MW boiler high-pressure heaters as high-pressure protection valves. In the course of high-intensity operation, when a piping leak or a trap failure occurs, it will cause the water level on the steam side to rise and easily cause high-pressure feed water to be poured into the turbine.
）循环图： Cycle diagram of inlet valve (inlet valve) and outlet valve ( outlet check valve ) for high feed water heater :
The following is a partial size analysis chart:
High inlet valve (angle type) J764Y-200C DN175
High inlet valve (angle type) J764Y-200C DN225 Material of main parts:
High inlet valve (straight-through) J761Y-200C DN175 Material of main parts:
High inlet valve (straight-through) J761Y-200C DN225 Material of main parts:
主要零部件材质及示意图： Material and schematic diagram of the main parts of the high outlet valve H62Y-200C DN175 :