Pressure testing machine is a kind of commonly used experimental equipment. The product is widely used in rubber, plastic sheet, pipe, profile and other materials. The product has the advantages of easy operation, stable performance, safe and reliable use. The pressure tester will produce some problems in use. Introduce the common faults and treatment methods of the pressure tester.
1, the oil pump does not come out of oil
Reason: There is an air filter in the oil pump and the oil valve seat does not match. There are scratches on the ball and ball seat.
Remedy: Open the pump high-pressure fuel pipe connector for exhaust. Clean and drain the air in the pump. Replace or repair the corresponding parts.
2, the oil pump is not stable (pointer can be seen stagnant reciprocating jitter).
Cause: The fluid viscosity is too small (too thin) or too dirty; there is air in the oil circuit. There is dirt or fluffing between the delivery valve piston and its bushing. There is an oil spill.
Remedy: Replace with a suitable viscosity of clean oil. Remove the air in the oil passage and lift the piston for a certain distance. Open the oil return plug. Wash and grind broached parts. Find out where the oil spill is to be excluded.
2. Oil pressure pulsation (return pipe of oil delivery valve, intermittent oil return, standard load measuring machine pointer jitter)
Cause: There is air in the pump. The viscosity of the oil is too small (too thin). Delivery valve throttle needle clearance is too large. There is dirt in the pump. The outlet valve seat does not match, and the ball and ball seat have burr scratches.
Remedy: Exclude air. Replace suitable oil. Reduce throttling needle clearance. Clean the oil pump. Replace or repair the corresponding parts.
3, the oil pressure does not hit the maximum load
Cause: The delivery valve oil plug is too tight or dirty with its sleeve. Delivery valve spring tension is too small. There is a big oil spill. The front end of the delivery valve piston leaks. Oil pipe joint leaks. The working piston gap is too large. Return valve needle valve does not match.
Remedy; Clean or grind the corresponding parts. Add washers or replace springs on the end of the spring. Eliminate oil spills. Tighten the nut. Replace the washer and tighten it. Slightly increase the oil viscosity or replace the piston. Combine the return valve.
5\The pointer does not return to zero after unloading
Cause: The rack is stuck. The swing bar fell too quickly and the rack jumped out of the roller.
Remedy: Adjust the spring plate. Re-engage the rack. Rotate the rack to zero.
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