Northman Hydraulic Co.,Ltd Agent (ZHANGFA Hydraulic) Northman Hydraulic Co.,Ltd Agent (ZHANGFA Hydraulic)

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  • Northman Low Noise Type Pilot Operated Relief Valve DRF-G06-1-30
Northman Low Noise Type Pilot Operated Relief Valve DRF-G06-1-30

Northman Low Noise Type Pilot Operated Relief Valve DRF-G06-1-30

Northman Low Noise Type Pilot Operated Relief Valve DRF-G06-1-30

How to order:

Northman Low Noise Type Pilot Operated Relief Valve DRF-G06-1-30
Northman Low Noise Type Pilot Operated Relief Valve DRF-G03-1-30
Northman Low Noise Type Pilot Operated Relief Valve DRF-G10-1-30

Northman Low Noise Type Pilot Operated Relief Valve DRF-G06-2-30
Northman Low Noise Type Pilot Operated Relief Valve DRF-G03-2-30
Northman Low Noise Type Pilot Operated Relief Valve DRF-G10-2-30

Northman Low Noise Type Pilot Operated Relief Valve DRF-G06-3-30
Northman Low Noise Type Pilot Operated Relief Valve DRF-G03-3-30
Northman Low Noise Type Pilot Operated Relief Valve DRF-G10-3-30

Working principle difference between pilot overflow valve and direct overflow valve:
 
1. Different performance at constant pressure:
 
Pilot overflow valve in the main spool because both ends are affected by the oil pressure, the main valve spring only needs a small stiffness, when the overflow flow changes caused by the spring compression change, the oil inlet pressure changes little, so the pilot overflow valve constant pressure performance is better than the direct action overflow valve.
 
2. Different sensitive reactions:
 
Pilot overflow valve is a secondary valve, its response is not as sensitive as the direct action overflow valve. In terms of static characteristics of overflow valve, pilot overflow valve has gentle characteristic curve, small pressure adjustment deviation and large opening ratio.
 
3. Different practical applications:
 
Pilot overflow valve should be used for system overflow pressure stability, direct action overflow valve due to high sensitivity should be used as safety valve. Direct action overflow valve can only be used for low pressure and small flow conditions, because of the control of high pressure or large flow, the need for greater stiffness of the hard spring, not only manual adjustment is difficult, and the valve opening slightly changed, it will cause large pressure fluctuations. Pilot relief valves are required when system pressure is high.
 
The pilot overflow valve and the direct overflow valve work the same principle:
 
1, overflow valve, inlet control, limit the highest pressure. Direct operation: only one main valve, the beginning of the inlet pressure control. Pilot type: there is a pilot valve, inlet pressure first makes the pilot valve action, and then make the main valve action.
 
2, the pilot valve spring software, reaction is faster, the control of the need for a smaller flow, the main flow from the main valve, a little like the circuit of the amplifier, small signal can drive. In addition: pilot valves have a remote control port can be remote control.
 

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