NQ3A valves are air bleed start-up valves. Their uses include:

• Facilitating pump priming during start-up in a block centre circuit.

QP valves are accumulator sense, pump unload, pilot valves. They are used to:

• Sense pressure in an accumulator at port 1 of the valve
• Unload the pump when the pressure at port 1 reaches the valve setting
• Close and recharge the accumulator when pressure at port 1 falls below the valve setting

Specifications of QP valves:

• Percentage ratio of 15% & above between unload setting and reset

 
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