Sun Hydraulics Pressure Reducing/Relieving Valve - Direct-acting - PRDBLAN

Features
 • Direct-acting, pressure reducing/relieving valves reduce a high primary pressure at the inlet (port 2) to a constant reduced pressure at port 1, with a full-flow relief function from port 1 to tank (port 3)
 • These valves incorporate a damped construction for stable operation allowing the use of high reduced pressure
 • All three-port pressure reducing and reducing/relieving cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size)
 • When considering mounting configurations, it is sometimes recommended that a full capacity return line (port 3) be used with reducing/relieving cartridges
 • Full reverse flow from reduced pressure (port 1) to inlet (port 2) may cause the main spool to close
 • If reverse free flow is required in the circuit, consider adding a separate check valve to the circuit
 • All spring ranges are tested for correct operation with 5000 psi (350 bar) inlet pressure
 • Suitable for accumulator circuits since the absence of pilot control flow results in reduced secondary circuit leakage
 • Direct acting concept provides highly reliable operation in contaminated systems, especially at dead headed conditions
 • Unlike pilot operated versions, direct acting valves exhibit a transitional step between reducing and relieving modes
 • This step equals 5% of the high end of the adjustment range, independent of the valve setting
 • Therefore, these valves may not be suitable for counterbalancing applications
 • Direct operated version offers superior dynamic response compared to equivalent pilot operated models
 • Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar)
 • Leakage specified in Technical Data is out of port 3 with a supply pressure of 2000 psi (140 bar) and the valve set at mid range
 • This leakage is directly proportional to pressure differential and inversely proportional to viscosity expressed in centistokes
 • W and Y controls (where applicable) can be specified with or without a special setting
 • When no special setting is specified, the valve is adjustable throughout its full range using the W or Y control
 • When a special setting is specified, this setting represents the maximum setting of the valve
 • Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids
 • Exposure to petroleum based fluids, greases and lubricants will damage the seals
 • Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations

Specifications

 • Cavity : T-11A
 • Series : 1
 • Capacity : 10 gpm
 • Factory Pressure Settings Established at : 0.25 gpm
 • Maximum Operating Pressure : 5000 psi
 • Maximum Valve Leakage at 110 SUS (24 cSt) : 2 in³/min.
 • Adjustment - No. of CW Turns from Min. to Max. setting : 5
 • Valve Hex Size : 7/8 in.
 • Valve Installation Torque : 30 - 35 lbf ft
 • Adjustment Screw Internal Hex Size : 5/32 in.
 • Locknut Hex Size : 9/16 in.
 • Locknut Torque : 80 - 90 lbf in.
 • Model Weight : 0.43 lb.
 • Seal kit - Cartridge : 990011007
 • Seal kit - Cartridge : 990011014
 • Seal kit - Cartridge : 990011002
 • Seal kit - Cartridge : 990011006

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