Sun Hydraulics offers a broad variety of balanced and unbalanced logic switching cartridges that can be used for a variety of directional control applications. Logic modulating cartridges for pressure and flow control applications are also offered. Sun logic cartridges can be conveniently applied using many mounting options.

  • Offer machine designers almost unlimited flexibility in logic circuit design
  • Can be remotely piloted using other Sun pilot products
  • Includes versions that accept a Sun pilot control directly into the hex end of the logic cartridge for integrated pilot control
  • Includes sealed pilot versions to prevent leakage between pilot and work ports
LE-UPPtoCSE.jpg

Unbalanced Poppet, Pilot-to-Close Switching Element

  • Maximum operating pressure = 5000 psi
  • Area ratio: A3 to A1 = 1.8:1
  • Area ratio: A3 to A2 = 2.25:1
  • Control orifice diameter = LODA, LODB, LODD, LOFA, LOFB, LOFD: 0.021 in., LOHA, LOHB,
  • LOHD: 0.031 in., LOJA, LOJB, LOJD: 0.035 in.
  • Pilot volume for complete shift = LOD*: 0.04 in³/min., LOF*: 0.07 in³/min., LOH*: 0.25 in³/min., LOJ*: 0.42 in³/min.
  • These valves are pressure responsive at all three ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes at any one port may cause a valve to switch from a closeld to an open position, or vice versa. All possible pressure changes in the complete circuit must be considered to assure a safe, functional system design.
LE-UPPtoCSEwIPCC.jpg

Unbalanced Poppet, Pilot-to-Close Switching Element with Integral Pilot Control Cavity

  • Maximum operating pressure = 5000 psi
  • Area ratio: A3 to A1 = 1.8:1
  • Area ratio: A3 to A2 = 2.25:1
  • Control orifice diameter = LOD*-8, LOD*-8, LOF*-8, LOF*-8: 0.021 in., LOH*, LOH*-8: 0.031 in., LOJ*, LOJ*-8: 0.035 in.
  • These valves are pressure responsive at all three ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes at any one port may cause a valve to switch from a closed to an open position, or vice versa. All possible pressure changes in the complete circuit must be considered to assure a safe, functional system design.
  • 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.
LE-UPPtoOSE.jpg

Unbalanced Poppet, Pilot-to-Open Switching Element

  • Maximum operating pressure = 5000 psi
  • Area ratio: A3 to A1 = 1.8:1
  • Area ratio: A3 to A2 = 2.25:1
  • Control orifice diameter = LKDC: 0.031 in., LKFC: 0.035 in., LKHC: 0.062 in., LKJC: 0.094 in.
  • Pilot volume for complete shift = LKDC: 0.02 in³/min., LKFC: 0.06 in³/min., LKHC: 0.15 in³/min., LKJC: 0.30 in³/min.
  • These valves are pressure responsive at all three ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes at any one port may cause a valve to switch from a closed to an open position, or vice versa. All possible pressure changes in the complete circuit must be considered to assure a safe, functional system design.
LE-NOME.jpg

Normally Open Modulating Element

  • Maximum operating pressure = 5000 psi
  • Maximum leakage at 150 SUS, port 3 = 1 in³/min.
  • Control orifice diameter = LPB*, LPD*, LPF*: 0.016 in., LPH*, LPJ*: 0.021 in. 
LE-NCME.jpg

Normally Closed Modulating Element

  • Maximum operating pressure = 5000 psi
  • Control orifice diameter = LRB*, LRD*, LRF*: 0.016 in., LRH*, LRJ*: 0.021 in.
LE-NODO.jpg

Normally Open, Direct Operated

  • Maximum operating pressure = 5000 psi (Port 1 and Port 2)
  • Minimum pilot pressure to shift valve = DODS: 400 psi, DOFS, DOHS, DOJS: 300 psi
  • Maximum valve leakage, Port 1 to Port 2 or Port 2 to Port 1 = 5 drops/min.
  • Pilot volume for complete shift = DODS: 0.01 in³/min., DOFS: 0.02 in³/min., DOHS: 0.05 in³/min., DOJS: 0.17 in³/min.
  • Valve will open when the pilot pressure falls below 145 psi.
  • Any back pressure at the drain port is directly additive to the required pilot pressure for reliable operation.
LE-NOVtoO.jpg

Normally Open, Vent-to-Operate

  • Maximum operating pressure = 5000 psi
  • Minimum pilot pressure to shift valve with Port 4 vented to tank = DODR: 400 psi, DOFR, DOHR, DOJR: 300 psi
  • Maximum valve leakage, Port 1 to Port 2 or Port 2 to Port 1 = 5 drops/min.
  • Control pilot flow = DODR: 25 in³/min., DOFR: 22 in³/min., DOHR, DOJR: 35 in³/min.
  • Valve will open when the pilot pressure falls below 145 psi or with Port 4 blocked.
  •  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 DAAA-***
  • solenoid pilot valve is ideal for this application.
LE-NOVtoOwIPCC.jpg

Normally Open, Vent-to-Operate with Integral Pilot Control Cavity

  • Maximum operating pressure = 5000 psi
  • Minimum pilot pressure to shift valve = DODR: 400 psi, DOFR, DOHR, DOJR: 300 psi
  • Maximum valve leakage, Port 1 to Port 2 or Port 2 to Port 1 = 5 drops/min.
  • Control pilot flow = DODR: 25 in³/min., DOFR: 22 in³/min., DOHR, DOJR: 35 in³/min.
  • Valve will open when the pilot pressure falls below 145 psi.
  • Any back pressure at the drain port is directly additive to the required pilot pressure.
  • 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.
LE-NOPA.jpg

Normally Open, Pressure Adjustable

  • Maximum operating pressure = 5000 psi
  • Minimum pilot pressure to shift valve = DODP: 400 psi, DOFP, DOH, DOJP: 300 psi
  • Maximum valve leakage, Port 1 to Port 2 or Port 2 to Port 1 = 5 drops/min.
  • Control pilot flow at shift = DODP, DOFP: 24 in³/min., DOHP, DOJP: 36 in³/min.
  • Valve will open when the pilot pressure drops 85% below setting.
  • Any back pressure at the drain port is directly additive to the required pilot pressure.
LE-NCDO.jpg

Normally Closed, Direct Operated

  • Maximum operating pressure = 5000 psi
  • Minimum pilot pressure to shift valve = DKDS: 400 psi, DKFS, DKHS, DKJS: 300 psi
  • Maximum valve leakage, Port 1 to Port 2 or Port 2 to Port 1 = 5 drops/min.
  • Pilot volume for complete shift = DKDS: 0.01 in³/min., DKFS: 0.02 in³/min., DKHS: 0.05 in³/min., DKJS: 0.17 in³/min.
  • Valve will reseat when the pilot pressure drops 85% below setting.
  • Any back pressure at the drain port is directly additive to the required pilot pressure.
LE-NCPA.jpg Normally Closed, Pressure Adjustable
  • Maximum operating pressure = 5000 psi
  • Minimum pilot pressure to shift valve = DKDP: 400 psi, DKFP, DKHP, DKJP: 300 psi
  • Maximum valve leakage, Port 1 to Port 2 or Port 2 to Port 1 = 5 drops/min.
  • Control pilot flow at shift = DKDP, DKFP: 24 in³/min., DKHP, DKJP: 36 in³/min.
  • Any back pressure at the drain port is directly additive to the required pilot pressure.
  • Valve will reseat when the pilot pressure falls to 85% of the cracking value. 
LE-NCVtoO.jpg

Normally Closed, Vent-to-Operate

  • Maximum operating pressure = 5000 psi
  • Minimum pilot pressure to shift valve with Port 4 vented to tank = DKDR: 400 psi,
  • DKFR, DKHR, DKJR: 300 psi
  • Maximum valve leakage, Port 1 to Port 2 or Port 2 to Port 1 = 5 drops/min.
  • Control pilot flow = DKDR: 25 in³/min., DKFR: 22 in³/min., DKHR, DKJR: 35 in³/min.
  • Valve will reseat when the pilot pressure falls below 145 psi.
  • 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 DAAA-***
  • solenoid pilot valve is ideal for this application.
LE-NCVtoOwIPCC.jpg

Normally Closed, Vent-to-Operate with Integral Pilot Control Cavity

  • Maximum operating pressure = 5000 psi
  • Minimum pilot pressure to shift valve with Port 4 vented to tank = DKDR: 400 psi,
  • DKFR, DKHR, DKJR: 300 psi
  • Maximum valve leakage, Port 1 to Port 2 or Port 2 to Port 1 = 5 drops/min.
  • Control pilot flow = DKDR: 25 in³/min., DKFR: 22 in³/min., DKHR, DKJR: 35 in³/min.
  • Valve will open when the pilot pressure falls below 145 psi.
  • Any back pressure at the drain port is directly additive to the required pilot pressure for reliable
  • operation.
  • 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.