The stability of the turbine shaft seal is directly related to maintenance cycle and operation safety of the unit.

due to the structure of the main shaft seal, water cooling and lubrication of technical water supply system to provide the requirements of high stability, otherwise it will affect the normal unit, run even led to the suspension of cooling water and dry friction, the high temperature lead to the main shaft seal burn unit.

take artesian pressure water supply of hydropower station, the cooling water to achieve the technical requirements of main shaft seal need, need to have excellent pressure reducing valve on the technical water supply system.

ZJY46H combined type pressure reducing Industrial Valves is a very good technical system of water supply equipment, it is in the operating conditions on the water supply system is very stable, the key of unit and load shedding under complicated conditions, according to the variation of pipe pressure and flow automatically adjust the outlet pressure and flow, to ensure that the valve after pressure and flow rate within the scope of the setting value, noise values and little fluctuation, and in the actual operation of hydropower station, the maintenance intervals up to 3 - Operating life of 5 years, have up to 17 years ( Dongjiang hydropower station in hunan province) 。 And ZJY46H combined pressure reducing valve is a main one for two sets of feedback system, makes the pressure reducing Industrial Valves can be achieved on the technical water supply system is not down.

at home and abroad, including the three gorges hydropower station, xiangjiaba hydropower station adopts the, is the domestic production of ZJY46H combined type pressure reducing valve, ZJY46H combined type pressure reducing valve in meet hydropower complex condition, to reach even exceed the international advanced level.

In an age when flow control valve is increasingly important, the researchers believe manufacturers should pay close attention to their results.
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