Qingdao Power Station Valve Co., Ltd. Qingdao Power Station Valve Co., Ltd.

Throttle Valve

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High-pressure inlet valve

High-pressure inlet valve

High-pressure heater inlet and outlet valves are installed at the inlet and outlet of the high-pressure heater, respectively. The two valves are used together (also known as high-pressure heater combined valves). When a high-pressure heater experiences a burst pipe or other fault requiring isolation, the two valves quickly switch to isolate the high-pressure heater, allowing water to enter the economizer through the high-pressure heater bypass to ensure continuous operation of the unit.

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High-pressure check valve

High-pressure check valve

High-pressure heater inlet and outlet valves are installed at the inlet and outlet of the high-pressure heater, respectively. The two valves are used together (also known as high-pressure heater combined valves). When a high-pressure heater experiences a burst pipe or other fault requiring isolation, the two valves quickly switch to isolate the high-pressure heater, allowing water to enter the economizer through the high-pressure heater bypass to ensure continuous operation of the unit.

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Quick-acting shut-off valve

Quick-acting shut-off valve

In large and medium-sized power plant feedwater systems, the feedwater regulating valve is generally eliminated after the adoption of variable-speed pumps (adjustable-speed pumps), and the feedwater quantity is automatically adjusted by the feedwater pump. When the unit operates at a low load (30%-50% load), due to the reduction of system resistance, the pump head is correspondingly reduced, resulting in insufficient pressure drop for reheater spray water cooling, leading to insufficient cooling water and local overheating of the reheater. When the above operating conditions occur, a pressure difference is quickly established through this valve (pressure holding) to ensure the required head for spray water cooling; when the unit operates at a high load, the valve opens quickly, achieving unimpeded flow, saving a large amount of plant electricity, and optimizing equipment operating conditions.

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Quick Throttle Valve

Quick Throttle Valve

After large and medium-sized power plants adopted variable speed pumps (variable frequency pumps) in their feedwater systems, feedwater regulating valves were generally eliminated, and the feedwater flow is automatically adjusted by the feedwater pump. When the unit operates at low load (30%-50% load), the reduced system resistance leads to a corresponding decrease in pump head. This results in insufficient pressure drop for superheater spray desuperheating, causing inadequate desuperheating water and localized superheater overheating. In such operating conditions, this valve quickly establishes a pressure difference (pressure holding) to ensure the required head for spray desuperheating; when the unit operates at high load, the valve opens rapidly, allowing flow without resistance, which can save significant plant power consumption and optimize equipment operating conditions.

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