Purchase now: Winner PB-2A-30-Y-8 Reducing Valve
Purchase now: Atlantech Drives provides you the Winner Hydraulics PB-2A-30-Y-8, a precision Pilot Operated Pressure Reducing Valve. This cartridge is a direct interchange for Sun Hydraulics Series 2 valves (fitting the T-2A Cavity). It is designed to take a high, fluctuating primary pressure at the inlet (Port 2) and reduce it to a stable, lower regulated pressure at the outlet (Port 1), regardless of flow demand. The pilot operation ensures a flat pressure curve and exceptional stability, making it ideal for clamping circuits or secondary control loops.
Technical Specifications and Sun Interchange T-2A
The «PB» series is the industry standard for pressure regulation. This specific model («2A») fits the Series 2 cavity (3-Port, 1-1/8″-12 thread). The «30» code indicates an adjustable pressure range up to 3000 PSI (210 Bar). The pilot section constantly samples the downstream pressure. If it exceeds the setting, the main spool throttles flow from the inlet to maintain the setpoint. It features a drain port (Port 3) that must be connected to the tank to allow the pilot flow to escape.
- Part Number: PB-2A-30-Y-8.
- Function: Pressure Reducing (Pilot Operated).
- Cavity: T-2A (Sun Series 2).
- Max Flow: 80 LPM (20 GPM).
- Pressure Setting: 210 Bar (3000 PSI).
- Adjustment: Screw/Knob (Code 8).
- Ports: 3-Port Design.
- Interchange: Replaces Sun PB*B series.
Expert Tips: Drain Line Backpressure
Watch the tank line. Expert Tip: Unlike 2-port relief valves, this 3-port reducing valve has a dedicated drain line (Port 3). Any backpressure in this drain line is additive to the valve setting (1:1 ratio). If your tank line has pressure spikes, your reduced pressure will spike too. Always route the drain of a sensitive reducing valve directly to the tank, separate from high-flow return lines.
Frequently Asked Questions (FAQs)
Q: Is this a relieving regulator?
A: Standard PBs are usually Non-Relieving or strictly reducing. If the downstream pressure rises (e.g., due to external force on a cylinder), this valve closes but does not vent the excess. For venting capability, you need a reducing/relieving valve (like the PP series).
Q: Does it fit a standard Common Cavity?
A: NO. It fits the Sun T-2A cavity. This is a unique thread and port geometry. It will not fit a standard SAE-10 cavity.
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