Wholesale Small Hydraulic Power Pack - Monoblock Valves-GDV45 series – Guorui

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Wholesale Small Hydraulic Power Pack - Monoblock Valves-GDV45 series – Guorui Detail:

Rated flow rate：	45L/min
Maximum flow rate：	55L/min
Maximum pressure at P port：	310bar
Maximum pressure at A/B port：	310bar
Maximum pressure at T port：	25bar
Internal leakage (at 70 bar):A/B toT ：	30-35CC/min
Temperature range of the hydraulic oil：
With NBR (BUNA-N) seals	-20℃-80℃
With FPM (VITON) seals	-20℃-100℃
Spool stroke (1/2 position)：	+7/-7 mm
With floating function (1/2 and F position)：	+7/-7 -9 mm
Recommend hydraulic oil viscosity range：	15-75mm²/s
Recommend temperature range：	-40℃-60℃

Operating Principle

GDV45-1 is an one spool valve. It is also an open center, 3 position 4 way valve. When spool is in neutral, flow from pump passes through neutral passage to tank. Produces very little pressure drop. When spool is move to “1” or “2” position, the neutral passage is blocked by spool. The flow from pump has to pass through the parallel passage to provide flow to spool’s metering to work port. The spool stroke is 7mm. For GDV45-1 mono-block valve, it cannot provide power beyond function.
2 Spool Mono-block Valve

GDV45-2 Two spool mono-block valve is also an open center, 3 position 4 way valve. When spool are all in neutral ,flow from pump passes through neutral passage to tank, and produces very little pressure drop. When one of the spool is moved to “1” or “2” position, the neutral passage is blocked by the spool. The flow from pump has to pass through the parallel passage to provide flow to spool’s metering to work port. There are options to choose for location of the inlet port and return port. There is also an option to have power beyond port. If first spool is moved to “1” or “2” position, then, the second spool’s neutral passage has no flow. The operator can operate two spools at the same time, but the speed of the controlled device is dependent on the load of the device.

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