1 fault profile butterfly valve seriyama hydropower station adopts PDF130 - WZ - 280 type butterfly valve, is a horizontal double flat valve structure. The valve body, valve, butterfly valve assembly includes work primary seal, bearing, jib, relay device, locking devices, heavy hammer and by-pass Industrial Valves, etc. Using aluminothermic welding butterfly valve body structure, body contact with the working seal ring in stainless steel material, prolong the service life of the sealing ring and improve the sealing performance. Seal is located in the downstream side of the valve, sealing surface USES the slope structure, which has good sealing performance. The bolts in the bottom of the valve body are eight as fixed body, can withstand the upward pressure relay apparatus and dynamic water on the valve of the upward force component, and cannot bear the water thrust when the valve seated. To increase the valve in the dynamic water closed since the closing moment of valve and valve body are designed by bias, its geometric center and the center of rotation offset 50 mm, increase the reliability of the closure. Solid special-shaped rubber is used in the main working seal valve on the Industrial Valves, with pressure ring and tighten the screw on the valve, to ensure the sealing ring is harmonic and the adjusting after localization, has a fixed lock screw. With 40 cr forged steel valve shaft material, contact with the bearing and shaft end seal with chrome plated protection, cylindrical pin fixed valve adopts insert. Bearing is composed of steel and copper tile, tile material of copper aluminum bronze ( ZCuAl1OFe3) , use u-shaped abutment shaft end sealing ring seal, the sealing force is adjustable, easy to change. The valve arranged two 200 mm diameter straight cylinder swing type relay, relay device of piston rod through the turning arm are connected to the valve spindle, chrome plated piston rod surface. Ask piston and cylinder seal using ptfe o-ring and combined sealing ring; Close the cylinder with two segments of relay device and throttling buffer structure, external use high-pressure hose connection. The control system. FYZ valve hydraulic control device for the butterfly valve open oil supply, pushing the relay device the valve and the heavy hammer to open after the adoption of hydraulic lock ingot, the locking oil source from the governor oil pressure device. When accident or unit should be normal downtime, the locking oil source switching off, the butterfly valve on its own two configuration by the heavy hammer ( All 3. 5 t） And hydraulic function to valve seated, have the effect of cut off water and protection unit. Seriyama hydropower station 2 failure phenomenon of butterfly valves in March 2000 to run, run to March 2002, found in the process of closing butterfly valve, when the butterfly Industrial Valves closing up to full stroke by about 95%, butterfly valve jib ( Heavy hammer) Stop falling, butterfly valve can't reach the seated position. The butterfly valve can only be fully open or close position two contradictory, butterfly valve position in the indeterminate state, cause water leakage, caused the strong noise, to repair operation of hydropower station, the larger safe hidden trouble. 3 3 reasons for analysis. 1 line in appear this kind of phenomenon may be due to the discharge of oil return pipe road due to relay is closed side oil cavity oil did not do, this may cause relay device piston can't reply to a seated position, lead to butterfly valve jib whereabouts cannot reach maximum stroke, butterfly valves not seated position. To inspect the operating line, decomposition inspections for oil valve in the line, to ensure that the operation line unimpeded. 3. 2 relay device structure in order to reduce in the process of closing the relay device speed and pressure of oil at the bottom of the piston impact relay, the relay operation device cylinder with two period of closing device, namely the throttling buffer structure. Throttle cleaning buffer structure of relay and relay device throttle valve adjustment, increase the throttle opening, make the flow of oil return, throttle valve before and after the pressure difference decrescent, conducive to relay the whereabouts of the piston. At the same time, the inspection found that the relay device surface of the piston rod chromium plating layer in good condition, no signs of rust jamming. After processing, using the above two methods have no obvious effect, explain the reason of the butterfly valve can't reach the seated position with the operating system ( Operating line and the relay device) Has nothing to do. （ Unfinished, then please see next! ）
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