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Pressure reducing/relieving valve from Sun Hydraulics

Description

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). Draining port 4 makes the valve insensitive to pressure at port 3. These valves incorporate a damped construction for stable operation allowing the use of high reduced pressure.

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  • Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
  • 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 on the drain (port 4) 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.
  • 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.
  • By controlling the pressure at the drain (port 4), the effective setting of the valve can be increased over the nominal valve setting.
  • 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.

Technical Data

Note: Data may vary by configuration. See CONFIGURATION section.

Cavity T-21A
Series 1
Capacity 10 gpm
Capacity (metric) 40 L/min.
Maximum Operating Pressure 5000 psi
Maximum Operating Pressure (metric) 350 bar
Factory Pressure Settings Established at 0.25 gpm
Maximum Valve Leakage at 110 SUS (24 cSt) 2 in³/min.@1000 psi
Maximum Valve Leakage at 110 SUS (24 cSt) (metric) 30 cc/min.@70 bar
Adjustment – No. of CW Turns from Min. to Max. setting 5
Valve Hex Size 7/8 in.
Valve Hex Size (metric) 22,2 mm
Valve Installation Torque 30 – 35 lbf ft
Valve Installation Torque (metric) 41 – 47 Nm
Adjustment Screw Internal Hex Size 5/32 in.
Adjustment Screw Internal Hex Size (metric) 4 mm
Locknut Hex Size 9/16 in.
Locknut Hex Size (metric) 15 mm
Locknut Torque 80 – 90 lbf in.
Locknut Torque (metric) 9 – 10 Nm
Model Weight 0.41 lb.
Model Weight (metric) 0.19 kg.
Seal kit – Cartridge Viton: 990021006

Configuration Options

Control

C Tamper Resistant – Factory Set
K Handknob
L Standard Screw Adjustment
O Handknob with Panel Mount

Adjustment Range

A 500 – 3000 psi (35 – 210 bar), 700 psi (50 bar) Standard Setting
B 50 – 1500 psi (3,5 – 105 bar), 200 psi (14 bar) Standard Setting
D 25 – 800 psi (1,7 – 55 bar), 200 psi (14 bar) Standard Setting
E 25 – 400 psi (1,7 – 28 bar), 200 psi (14 bar) Standard Setting
S 25 – 200 psi (1,7 – 14 bar), 100 psi (7 bar) Standard Setting
W 750 – 4500 psi (50 – 315 bar), 1000 psi (70 bar) Standard Setting

Seal Material

N Buna-N
V Viton

Material/Coating

/LH Mild Steel, Zinc-Nickel
Cavity: T-21A
Nominal Capacity: 40 lpm (10 gpm)
Downloads
PDFSTP
Possible variants

PSDBCAN, PSDB-CAN, PSDBCAN/LH, PSDB-CAN/LH, PSDBCAV, PSDB-CAV, PSDBCAV/LH, PSDB-CAV/LH, PSDBCBN, PSDB-CBN, PSDBCBN/LH, PSDB-CBN/LH, PSDBCBV, PSDB-CBV, PSDBCBV/LH, PSDB-CBV/LH, PSDBCDN, PSDB-CDN, PSDBCDN/LH, PSDB-CDN/LH, PSDBCDV, PSDB-CDV, PSDBCDV/LH, PSDB-CDV/LH, PSDBCEN, PSDB-CEN, PSDBCEN/LH, PSDB-CEN/LH, PSDBCEV, PSDB-CEV, PSDBCEV/LH, PSDB-CEV/LH, PSDBCSN, PSDB-CSN, PSDBCSN/LH, PSDB-CSN/LH, PSDBCSV, PSDB-CSV, PSDBCSV/LH, PSDB-CSV/LH, PSDBCWN, PSDB-CWN, PSDBCWN/LH, PSDB-CWN/LH, PSDBCWV, PSDB-CWV, PSDBCWV/LH, PSDB-CWV/LH, PSDBKAN, PSDB-KAN, PSDBKAV, PSDB-KAV, PSDBKBN, PSDB-KBN, PSDBKBV, PSDB-KBV, PSDBKDN, PSDB-KDN, PSDBKDV, PSDB-KDV, PSDBKEN, PSDB-KEN, PSDBKEV, PSDB-KEV, PSDBKSN, PSDB-KSN, PSDBKSV, PSDB-KSV, PSDBKWN, PSDB-KWN, PSDBKWV, PSDB-KWV, PSDBLAN, PSDB-LAN, PSDBLAN/LH, PSDB-LAN/LH, PSDBLAV, PSDB-LAV, PSDBLAV/LH, PSDB-LAV/LH, PSDBLBN, PSDB-LBN, PSDBLBN/LH, PSDB-LBN/LH, PSDBLBV, PSDB-LBV, PSDBLBV/LH, PSDB-LBV/LH, PSDBLDN, PSDB-LDN, PSDBLDN/LH, PSDB-LDN/LH, PSDBLDV, PSDB-LDV, PSDBLDV/LH, PSDB-LDV/LH, PSDBLEN, PSDB-LEN, PSDBLEN/LH, PSDB-LEN/LH, PSDBLEV, PSDB-LEV, PSDBLEV/LH, PSDB-LEV/LH, PSDBLSN, PSDB-LSN, PSDBLSN/LH, PSDB-LSN/LH, PSDBLSV, PSDB-LSV, PSDBLSV/LH, PSDB-LSV/LH, PSDBLWN, PSDB-LWN, PSDBLWN/LH, PSDB-LWN/LH, PSDBLWV, PSDB-LWV, PSDBLWV/LH, PSDB-LWV/LH, PSDBOAN, PSDB-OAN, PSDBOAV, PSDB-OAV, PSDBOBN, PSDB-OBN, PSDBOBV, PSDB-OBV, PSDBODN, PSDB-ODN, PSDBODV, PSDB-ODV, PSDBOEN, PSDB-OEN, PSDBOEV, PSDB-OEV, PSDBOSN, PSDB-OSN, PSDBOSV, PSDB-OSV, PSDBOWN, PSDB-OWN, PSDBOWV, PSDB-OWV

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