LDF two shut-off valve I. Overview LDF type two shut-off valve is a two-stage valve is closed. First closure for quick closing, and the second close to the slow shutdown. It is installed in the main oil on the road with the governor valve and wicket between relay, relay by controlling the closing speed to prevent water hammer accidents and ensure safe and reliable operation of hydroelectric generating set. This product is based on the traditional products for sealing and second closed throttle device has been improved to make it seal better, slowly close the adjustment more convenient. Second, the technical parameters Rated pressure: 2.5MPa 4.0MPa 6.4MPa Power supply voltage: 220VDC 110VDC 220VAC connection: flange connection, flange standard: GB9119-2000 Connector Type: pipe, card sets, flaring Ambient temperature: 5 ~ 45 ℃ Relative humidity: ≤95% RH