Process And Quality Assurance Of High-pressure Grease Fittings

Process control

Our High Pressure Grease Fitting are surface hardened in a sealed quenching furnace and have complete atmosphere control functions. This eliminates zoom and ensures perfect control of the case depth (0.006″-0.008″). The hardness of Rockwell 15N grade is controlled at a minimum of 85.

The accessories are tested to ensure excellent workmanship when the surface hardens.


Automated assembly can accurately control the entire process. Insert the ball check valve first and then the spring. A lip is then formed to hold the assembly in place. After the assembly is complete, the accessories will continue to undergo integrity and reliability testing.

Automation is used to assist in assembling parts to ensure quality.

Quality assurance

The accessories are tested to meet the highest standards. The test includes automatic inspection of ball inspection, load test under harsh environment and performance test of field reliability.

an examination

We use optical inspection to ensure that ball check valves that are not installed correctly will not let high-pressure grease fittings leave the equipment.


Grease accessories are subjected to impact testing to simulate the abuse of accessories that may be encountered in the field. This test ensures that the nipple has the proper strength and hardness.

Our high-pressure grease fittings are tested to ensure that they can withstand the harsh environments they may be exposed to.

Performance Testing

Opening pressure test: By opening at a maximum pressure of less than 435 psi max, to ensure that the ball check valve and spring can work normally, which is consistent with commercial actual and safe operations.

Back pressure test: Ensure that the ball check valve will remain in place and the fittings will not leak too much due to pressure buildup. 900 psi is the minimum pressure at which standard fittings can leak. The special leak-proof design can withstand pressures up to 10,000 psi.

Working pressure test: The “Blowout” test determines the maximum working pressure that the accessory can withstand without damaging the spring, steel ball and the main body of the accessory. Pressurize the test equipment to 8,000 psi and release immediately.

Post time: Apr-20-2021