蝴蝶查阀门

The hydraulic controlled butterfly check valve is a kind of tailor-made products, as it can be different combination withcheck valve and control system. The basic valve is designed to be automatically closed by gravity closing devices, and opened by electric and hydraulic actuator. Material Name of PartMaterialStandardBody & DiscCast steelASTM A 216 Gr. WCBShaftAlloy Steel orStainless steelASTM A182 Gr F6aASTM A 564 TYPE 630 or AISI 316, 304, 431SeatStainless steelAISI 316, 304Retaining RingStainless steelASTM A 296 Grade CF-8 or AISI304 Specification Valve pressure rating: 2.5 bar 100 bar. Valve size: DN150 DN1200 Valve testing: All valve testing is in accordance with AWWA C504, latest revision which include general inspection, performance test and hydrostatic pressure test that is according to valve pressure standard. Valve coating: it is according to request for color and thickness. Control with hydraulic system The valve is hydraulically operated by an AC solenoid controlled ball valve (the solenoid is with manual operation). In case of emergency, the valve can be closed under the flow condition at maximum discharge and maximum head. The closing time is adjustable for both opening and closing. The operating mechanism consists of hydraulic cylinder and counter weight. The valve is held open by hydraulic pressure in the cylinder only, closing by loss of pressure. Manually lock is provided on disc when it is in close position by a set of control units. The cylinder is fabricated of welded steel pipe. The cylinder bore is honed to a polished finish. Flange is steel and with gaskets or seal rings to remain oil-tight at all operating pressure ranges. The rod end flanges contain a bronze bushing with sealing. The piston is made of cast steel with V type of packing and metal piston rings which is according to oil pressure rating. The rod is straight and true, made of chromium-plated forged steel. The oil pressure system is provided .Any oil leakage will be collected and returning to the oil sump tank. 1.Basic Logic The emergency butterfly valve is interlock with pump. A. Under normal working condition: First, open the valve to 15% degree, then start the pump, valve will continue to open till fully opened; In closing procedure, shut off the emergency butterfly valve to 15% opening degree first, then shut down the pump, valve will close continuously till fully closed position. The speed of this two step closure is adjustable. B. Power failure: The pump will be shut down by unexpected power failure; the emergency butterfly valve will be automatically closed only by counter weight. 2.Operating procedure 2.1 Valve open Starting the oil pump, pressured oil will go through filter, throttling valve, check valve, high pressure oil tube to the bottom of oil cylinder. The pressured oil will push the piston, make the lever lifting the counterweight, at the same time, and make the valve shaft and disc turning, then open the valve. The opening speed is adjustable, and can be achieved by adjusting the throttle valve. The fully open time is between 20 90s. 2.2 Valve close In pump close procedure or unexpected power failure occurred, the solenoid is de-energized, with the help of counterweight, valve starts to close. The closing procedure has two features: a. Quick closing the first 60 80% stroke is in quick closing, and takes time about 2.5 10s; b. The last 30% is slow closing, closing time can be adjustable between 50 80 s. 2.3 Manually open/close the valve (power loss or solenoid in trouble) Manually open the valve: close the solenoid manually, turning the pump by hand, the valve can be opened, and counterweight will be lifted. Manually close the valve: Open the stop valve,pressured oil will go back to oil cylinder, with the help of counterweight, valve will be closed. 3.There are two types of solenoid control features 3.1 It is the one which mentioned above, solenoid should be energized all the time when valve opened. 3.2 The other is that solenoid will be de-energized, and will be energized only when close the valve. This type of solenoid is highly recommended to the end-user who has the UPS system. It will be more safely. 4.Oil Accumulator There is an oil accumulator inside the hydraulic control unit. The oil accumulator will start to work automatically when there is a leakage. In case, the oil pressure is below 4MPa, pressure relay will start the motor, and compensate the pressure automatically, and it will be stopped when pressure reaches 16MPa. (Another relay will work, and shut down the motor) 5.Electric and control 5.1 Power source: AC380V/50Hz 5.2 The control system can meet the requirement for local and remote control. There are feedback signals to center control room. The signal include: 5.2.1 local /remote control for opening valve 5.2.2 local /remote control for closing valve 5.2.3 A flashing lamp to indicate the opening sequence, and remain ON when valve is open 5.2.4 A flashing lamp to indicate the closing sequence, and remain OFF when valve is closed. 5.2.5 A manually operated switch located in the control room will allow the operator to override all controls and initiate the emergency close sequence. 6.Disc lock system There are two ways to lock the disc. One is interlink with pump control panel. The pump control panel will send out a opening signal to the electric control panel of emergency valve when pump is running at its rated head, then the control panel of valve will start the procedure of valve opening. Before that, emergency valve will remain in close position until the opening commend coming. The second is manual lock the disc by means of locking the counter-weight. The mechanical lock of disc need man-power to open the lock before opening the valve.(please see part C in typical drawing) Dimension *Dimension is on request.