Troubleshooting of Copes Vulcan bypass valve

Multiple cooling water valves share the same water supply main, causing mutual interference: when two cooling water valves operate simultaneously, water pressure fluctuations can cause unexpected changes in the flow rate of the other valve. Solution: Install a one-way valve and a stabilizing accumulator in front of each cooling water valve.

The VOII type suction spray cooler has insufficient suction capacity under high vacuum: when the pressure on the LP side approaches absolute vacuum, the suction spray effect decreases. It can be changed to steam atomization and the injection steam flow rate can be increased.

Individual nozzles of MNSD multi nozzle desuperheater are blocked: During daily operation, perform regular full open close operations and use steam to blow the nozzles.

Preventive maintenance cycle and spare parts recommendations

Based on Copes Vulcan and industry experience, it is recommended to conduct maintenance according to the following cycles:

Key inspection contents of component cycle

Check the erosion amount and weld layer thickness of the HUSH orifice plate every 3 years or 500 cumulative actions of the bypass valve internals; Measure the gap between the balance plug and the cage sleeve

The sealing surface of the valve seat shall undergo dye penetrant testing annually (if frequently operated), with a grinding depth not exceeding 0.5mm

Disassemble and clean the cooling water nozzle every 6 months, check the wear of the nozzle hole diameter (replace if it increases by more than 10%)

Pneumatic actuator checks diaphragm/piston seals every six months, tests full stroke time, and verifies limit switches

HPU hydraulic oil is sampled and tested annually, with a moisture content of ≤ 500ppm and an acid value of ≤ 0.2 mgKOH/g (phosphate ester)

The nitrogen pressure of the accumulator should be checked quarterly using a specialized nitrogen filling tool and replenished to the predetermined value (calculated as 60%~80% of the system working pressure)

During each major overhaul of the discharge pipe, the endoscope checks for small hole blockage and weld seam cracks

Emergency spare parts list:

HUSH orifice plate sealing gasket (high-temperature graphite reinforced type)

Valve seat/disc grinding tool and spare welding parts

Servo valve (for electro-hydraulic systems)

Quick exhaust valve and sealing ring repair kit

Flexible graphite packing ring (high temperature grade)