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RPIT

Relief valve from Sun Hydraulics

Description

Pilot-operated, anti shock relief cartridges limit maximum system pressure and also limit the rate of pressure rise. The valve opens and then ramps closed at a constant speed, independent of settings and flows. The adjust screw determines the maximum (relief) setting and the minimum (threshold) setting.

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  • All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size).
  • Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
  • Not suitable for use in load holding applications.
  • When pressure at the inlet (port 1) exceeds the threshold setting, the valve opens to tank (port 2). The pilot section moves forward at a steady rate, increasing the setting by compressing the pilot spring. Maximum setting is achieved when the pilot section reaches a mechanical stop.
  • Valve provides protection for pumps and motors from pressure transients due to sudden load changes, especially variable displacement pumps, since the displacement mechanism is sometimes too slow to catch these pressure transients.
  • Valve provides protection for hydrostatic drives by reducing the jerk caused by sudden reversals. The valve is suitable for cross-port applications.
  • When used with a switching device, the valve can provide the ramp characteristic typically provided by proportional valves.
  • Small power units can be started against an anti shock relief to provide longer pump life.
  • Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
  • 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-16A
Series 3
Capacity 100 gpm
Capacity (metric) 380 L/min.
Maximum Operating Pressure 5000 psi
Maximum Operating Pressure (metric) 350 bar
Factory Pressure Settings Established at 4 gpm
Factory Pressure Settings Established at (metric) 15 L/min.
Control Pilot Flow 10 – 25 in³/min.
Control Pilot Flow (metric) 0,16 – 0,41 L/min.
Pressure Ramp Up Time 300 – 500 ms
Response Time – Typical 2 ms
Adjustment – No. of CW Turns from Min. to Max. setting 4.5
Valve Hex Size 1 1/4 in.
Valve Hex Size (metric) 31,8 mm
Valve Installation Torque 150 – 160 lbf ft
Valve Installation Torque (metric) 203 – 217 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 1.61 lb.
Model Weight (metric) 0.73 kg.
U.S. Patent # 6,039,070
Seal kit – Cartridge Viton: 990316006

Configuration Options

Control

C Tamper Resistant – Factory Set
L Standard Screw Adjustment

Adjustment Range

A 2000 – 3000 psi (140 – 210 bar), 2000 psi (140 bar) Standard Setting
C 4500 – 6000 psi (315 – 420 bar), 4500 psi (315 bar) Standard Setting
W 3000 – 4500 psi (210 – 315 bar), 3000 psi (210 bar) Standard Setting

Seal Material

N Buna-N
V Viton

Material/Coating

/AP Stainless Steel, Passivated
Cavity: T-16A
Nominal Capacity: 100 gpm (380 lpm)
Downloads
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Possible variants

RPITCAN, RPIT-CAN, RPITCAN/AP, RPIT-CAN/AP, RPITCAV, RPIT-CAV, RPITCAV/AP, RPIT-CAV/AP, RPITCCN, RPIT-CCN, RPITCCN/AP, RPIT-CCN/AP, RPITCCV, RPIT-CCV, RPITCCV/AP, RPIT-CCV/AP, RPITCWN, RPIT-CWN, RPITCWN/AP, RPIT-CWN/AP, RPITCWV, RPIT-CWV, RPITCWV/AP, RPIT-CWV/AP, RPITLAN, RPIT-LAN, RPITLAN/AP, RPIT-LAN/AP, RPITLAV, RPIT-LAV, RPITLAV/AP, RPIT-LAV/AP, RPITLCN, RPIT-LCN, RPITLCN/AP, RPIT-LCN/AP, RPITLCV, RPIT-LCV, RPITLCV/AP, RPIT-LCV/AP, RPITLWN, RPIT-LWN, RPITLWN/AP, RPIT-LWN/AP, RPITLWV, RPIT-LWV, RPITLWV/AP, RPIT-LWV/AP

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