AAK Hydraulic Pressure Control Valve 100% holding Pressure

Shunnar is from Pakistan and has been purchasing hydraulic valves in China for quite some time. In the second half of last year, they purchased a hydraulic pressure control valve from a hydraulic cartridge valve manufacturer in Ningbo China, which is equivalent to a model of HydraForce. 3 months later, the customer complained that the hydraulic pressure control valve did not hold pressure. The original manufacturer claimed that it was caused by a leak and it was difficult to avoid it 100%. Shunnar realized that the manufacturing quality of the original hydraulic cartridge valve manufacturer was unstable. 

Shunnar found AAK hydraulic valves on Google and left a message:

1. Does AAK has this hydraulic pressure control valve equivalent to HydraForce model?

2. What is the pressure holding performance?

3. What is the lead time for 100 hydraulic pressure control valves of this model?

https://www.aakindustry.com/info-detail/pressure-control-valves-aak615