Purchase now: Winner PB-17A-30-Y-8 Series 3 Valve
Purchase now: Atlantech Drives provides you the Winner Hydraulics PB-17A-30-Y-8. This is a heavy-duty Pilot Operated Pressure Reducing Valve designed for higher flow applications. It fits the larger Sun Hydraulics T-17A Cavity (Series 3), which allows for significantly greater flow throughput (up to 160-200 LPM) compared to the Series 2 valves. It is used to supply a regulated sub-circuit from a high-pressure main line, such as supplying a 50-bar lube system from a 200-bar main pump line.
Technical Specifications and Series 3 Capacity
The PB-17A-30-Y-8 is built to handle the demands of industrial power units. The «30» range allows adjustment up to 210 Bar. The valve is «Normally Open»—it allows full flow until the downstream pressure rises to the set point, at which point it throttles closes. Being pilot operated, it has very low hysteresis and holds the set pressure accurately even as the flow demand changes drastically. The «Y» typically denotes standard Buna-N seals, suitable for mineral oils.
- Part Number: PB-17A-30-Y-8.
- Series: Series 3 (High Flow).
- Cavity: T-17A (1-1/4″-12 UNF).
- Flow Capacity: ~160 LPM (40 GPM).
- Regulation: Pilot Operated.
- Max Inlet Pressure: 350 Bar (5000 PSI).
- Reduced Pressure: Adj. 3000 PSI Max.
- Adjustment: Internal Hex or Knob.
Expert Installation Advice: Cavity Machining
Respect the torque. Expert Tip: Series 3 cartridges (T-17A) are large. When tightening them into the manifold, ensure you adhere to the torque spec (typically 200-215 Nm). Over-torquing can distort the cartridge cage, causing the main spool to bind (stick). If the valve regulates erratically or gets stuck open, check if the installation torque was excessive or if the cavity concentricity is out of spec.
Frequently Asked Questions (FAQs)
Q: Can I use this to replace a Sun PBFB-LAN?
A: Likely yes. The functional logic (Pilot Reducing), Cavity (T-17A), and Capacity are compatible. Always verify the specific pressure adjustment range («30» vs Sun’s code «A» or «B») before swapping.
Q: What happens if flow is blocked downstream?
A: The valve will close completely to maintain the pressure. However, since it is a spool valve, there is a small «pilot flow» (leakage) from inlet to drain (0.25 – 0.5 LPM). Ensure your pump can supply this minimum pilot flow.
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