AAK Hydraulic Cartridge Relief Valve with 2-stage buffering function, increased

Osborne, from Iran, sent us a PO for 500 hydraulic cartridge relief valves today. I was not surprised by this repeat order, because at the time of inquiry, he said that as long as the quality was stable, he would repeat the order twice a year. In the second half of last year, their hydraulic pump needed hydraulic cartridge relief valve. He tried samples from 2 overseas hydraulic cartridge relief valve manufacturers, but the buffering function of the hydraulic cartridge relief valve was ordinary, which affected the operation of the equipment. Osborne contacted other cartridge valve manufacturers, but failed.

I also don't know how Osborne found AAK hydraulic cartridge valve. AAK had no customers in Iran before. He left a message on the AAK website: please provide me your address, I would send you a sample to copy, and the buffering function of the hydraulic cartridge relief valve must be met. After receiving his hydraulic cartridge relief valve sample, according to his hydraulic system schematic diagram, and the video of equipment commissioning, after discussion of AAK engineers, a plan was worked out. After 45 days, AAK sent 5 samples of hydraulic cartridge relief valve. 2 weeks later, Osborne sent us an email to inform that the buffer function of AAK hydraulic cartridge relief valve met their equipment requirements. The first order of 500 hydraulic cartridge relief valves was also attached. After confirming the delivery date, the full payment was made the next day. The Iranian customer was so refreshing and efficient, which is out of my expectation.

The two-stage buffer of AAK hydraulic cartridge relief valve can eliminate the pressure pulse of the hydraulic system and improve the service life of the equipment by at least 20%. The optimized hydraulic cartridge relief valve, when the pressure at the oil inlet reaches the first or second pressure, the two buffer pistons can act successively to realize the opening or closing of the hydraulic cartridge relief valve, absorb the pressure pulse at the oil inlet, and eliminate the system pressure impact. Here is the structure innovation of the hydraulic cartridge relief valve that AAK works out:

1. A sliding valve spool is arranged in the valve body cavity of the hydraulic cartridge relief valve. The left end of the valve rod is sleeved with a two-stage buffer piston, and the valve rod is equipped with a compression spring. One end of the compression spring is matched with the valve spool, and the other end is connected with the secondary buffer piston, and the sliding rod of the secondary buffer piston is set with the primary buffer piston.

2. The left port of the valve body is equipped with a plug, which forms a two-stage buffer cavity between the plug and the two-stage buffer piston. The two-stage buffer cavity is connected with the oil inlet through the two-stage buffer orifice and the valve spool orifice.