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DOFR8

Logic element from Sun Hydraulics

Description

This is a normally open, balanced poppet, switching element with an integral T-8A control cavity. With a 2-way valve in the closed position installed in the T-8A control cavity, the poppet remains open. Opening the 2-way valve shifts the poppet to the closed position, provided there is sufficient pressure at port 3.

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  • Unique balanced construction provides predictable switching with 5000 psi (350 bar) at port 1 and port 2. Switching will only occur when both a minimum pilot pressure of 400 psi (30 bar) is present and pilot control valve is open.
  • Valve will open when the pilot pressure falls below 145 psi (10 bar).
  • These valves are hydraulically balanced between port 1 and port 2.
  • Port 1 and port 2 are fully sealed from port 3 and port 4. Ports 3 and 4 are positively sealed.
  • Any backpressure at the drain port is directly additive to the required pilot pressure for reliable operation.
  • Leakage rate between port 1 and port 2 is very low, typically less than 10 drops/min. at 5000 psi (0,7 cc/min at 350 bar).
  • NOTE: With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control valve should then be installed into the main stage valve to its required torque value.
  • The -8 control option allows the pilot control valve to be incorporated directly into the end of the logic cartridge via the T-8A cavity. These pilot control cartridges are sold separately and include electro-proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot Control Cartridges.
  • All ports will accept 5000 psi (350 bar).
  • 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-22A
Series 2
Capacity 30 gpm
Capacity (metric) 120 L/min.
Maximum Operating Pressure 5000 psi
Maximum Operating Pressure (metric) 350 bar
Minimum Pilot Pressure Required to Shift Valve 300 psi
Minimum Pilot Pressure Required to Shift Valve (metric) 20 bar
Control Pilot Flow See Performance Data
Maximum Valve Leakage at 110 SUS (24 cSt) 10 drops/min.@5000 psi
Maximum Valve Leakage at 110 SUS (24 cSt) (metric) 0,7 cc/min.@350 bar
Pilot Control Cavity T-8A
Pilot Control Valve Installation Torque 20 – 25 lbf ft
Pilot Control Valve Installation Torque (metric) 27 – 33 Nm
Pilot Control Valve Hex Size 7/8 in.
Pilot Control Valve Hex Size (metric) 22,2 mm
Valve Hex Size 1 1/8 in.
Valve Hex Size (metric) 28,6 mm
Valve Installation Torque 45 – 50 lbf ft
Valve Installation Torque (metric) 61 – 68 Nm
Model Weight 0.58 lb.
Model Weight (metric) 0.26 kg.
Seal kit – Cartridge Viton: 990022006

Configuration Options

Minimum Pilot Pressure

H 300 psi (20 bar)

Seal Material

N Buna-N
V Viton
Cavity: T-22A
Nominal Capacity: 30 gpm (120 lpm)
Downloads
PDFSTP
Possible variants

DOFR8HN,DOFR8HV,DOFR-8HN,DOFR-8HV

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