Created on 05/10/2017

 2017 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2

MODEL

DKFR8

Normally closed, balanced poppet, logic element with integral T-8A control

cavity - vent-to-open

SERIES 2 / CAPACITY: 120 L/min. / CAVITY: T-22A

(H)MINIMUM PILOT PRESSURE

H 300 psi (20 bar)

(N)SEAL MATERIAL

N Buna-N

V Viton

NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.

This is a normally closed, 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 closed. Opening the 2-way

valve shifts the poppet to the open position, provided there is sufficient pressure at port 3.

TECHNICAL DATA

Cavity T-22A

Series 2

Capacity 120 L/min.

Minimum Pilot Pressure Required to Shift Valve 20 bar

Maximum Operating Pressure 350 bar

Control Pilot Flow See Performance Data

Maximum Valve Leakage at 110 SUS (24 cSt) 0,7 cc/min.@350 bar

Pilot Control Cavity T-8A

Pilot Control Valve Installation Torque 27 - 33 Nm

Pilot Control Valve Hex Size 22,2 mm

Valve Hex Size 28,6 mm

Valve Installation Torque 61 - 68 Nm

Seal kit - Cartridge Buna: 990022007

Seal kit - Cartridge Polyurethane: 990022002

Seal kit - Cartridge Viton: 990022006

Model Weight 0.26 kg.

snhy.com/

DKFR8

Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at

point of use.

NOTES

Model Code Example: DKFR8HNCONFIGURATION OPTIONS

Created on 05/10/2017

 2017 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2

TECHNICAL FEATURES

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.

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).

Valve will reseat when the pilot pressure falls below 145 psi (10 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.

PERFORMANCE CURVES

RELATED MODELS

DKFR Normally closed, balanced poppet, logic element - vent-to-open