Direct-acting, pressure reducing/relieving main stage piloted from port 4
Capacity:
20 gpm (80 L/min.)
Functional Group:
Products : Cartridges : Reducing/Relieving : 4 Port : Direct Acting, Main Stage
Model:
PSFT
Product Description
The direct-acting reducer/reliever main section is meant to act as an interface between a low flow pressure source at port
4 and a circuit with higher flow requirements. The valve will reduce a high primary pressure at the inlet (port 2) to a
reduced pressure at port 1, with a full-flow relief function from port 1 to tank (port 3).
The valve incorporates a damped construction for stable operation allowing the use of high reduced pressure.
Technical Features
The valve is biased to the relieving mode with a 100 psi (7 bar) spring.
Pressure at port 4 is directly added to the
setting of the valve once this
threshold is exceeded. For example, 1000 psi (70 bar) at port 4 will
result in a setting of 900 psi (63 bar) at port 1.
Direct operated version offers superior dynamic response compared to
equivalent pilot operated models.
Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
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).
All spring ranges are tested for correct operation with 5000 psi (350
bar) inlet pressure.
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.
Suitable for accumulator circuits since the absence of pilot control flow
results in reduced secondary circuit leakage.
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.
Direct acting concept provides highly reliable operation in
contaminated systems, especially at dead headed conditions.
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
U.S. Units Metric Units
Cavity T-22A
Capacity 20 gpm 80 L/min.
Factory Pressure Settings Established at blocked control port (dead headed)
Maximum Operating Pressure 5000 psi 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 3 in³/min.@1000 psi 50 cc/min.@70 bar
Series (from Cavity) Series 2
Valve Hex Size 1 1/8 in. 28,6 mm
Valve Installation Torque 45 - 50 lbf ft 60 - 70 Nm
Seal Kits - Cartridge Buna: 990-022-007
Seal Kits - Cartridge Viton: 990-022-006
Model Weight 2.60 lb. 1.18 kg.
Download
PSFT-XFN
$126.10
Recommended List Price
Control
Bias Pressure
Seal Material
Standard Options
X Not Adjustable +0.00
Standard Options
F 100 psi (7 bar) +0.00
Standard Options
N Buna-N +0.00
V Viton +6.00
Preferred
Options
Special Notes
No Special Notes Available for selected model.
SUN RECOMMENDED QUANTITY DISCOUNTS FOR STANDARD PRODUCTS
Per line item
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vary. Sun's authorized distributors carry local inventory, and are qualified to assist customers in the selection, application, and purchase of our products. To
find the nearest Sun authorized distributor go to Distributor Search.
Quantity: 1-2 3-9 10-29 30-99 100+
Discount: List: 7% 15% 25% Consult Distributor
SUN cavity form tools, amplifier hand held programmer, and amplifier infrared cable are complimentary products sold at net prices
established to cover cost only and are not subject to discounting.
Prices for custom products and modifications of standard valves are by quotation only.
Sun Hydraulics Corporation reserves the right to change existing prices and discounts at any time without notice to its customers.
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