Created on 02/18/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
DKDR
Normally closed, balanced poppet, logic element - vent-to-open
SERIES 1 / CAPACITY: 15 gpm / CAVITY: T-21A
This is a normally closed, balanced poppet, switching element. When the vent port (port 4) is blocked, the poppet
remains in the closed position. Venting port 4 shifts it to the open position, provided there is sufficient pressure at
port 3.
TECHNICAL DATA
Minimum Pilot Pressure Required to Shift Valve 400 psi
Maximum Operating Pressure 5000 psi
Control Pilot Flow See Performance Data
Maximum Valve Leakage at 110 SUS (24 cSt) 10 drops/min.@5000 psi
Seal kit - Cartridge Buna: 990-021-007
Seal kit - Cartridge Polyurethane: 990-021-002
Seal kit - Cartridge Viton: 990-021-006
(X)CONTROL
X Vent to Operate
(H)MINIMUM PILOT PRESSURE
H 400 psi (28 bar)
(N)SEAL MATERIAL
N Buna-N
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
/LH Mild Steel, Zinc-Nickel
snhy.com/
DKDR
TECHNICAL FEATURES
Unique balanced construction provides predictable switching with 5000 psi (350 bar) at both ports 1 and 2, with the vent (port 4) open and a minimum pilot pressure
of 400 psi (30 bar) at port 3.
Port 1 and port 2 are fully sealed from port 3 and port 4. Ports 3 and 4 are positively sealed.
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).
Port 4 may be externally connected to a pilot switching valve. The pilot valve should have a leakage rate of less than 10 drops/min. and be able to satisfy the pilot
flow requirements. Sun model DAA*-*** solenoid pilot valve is ideal for this application.
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
Model Code Example: DKDRXHNCONFIGURATION OPTIONS
