Ross Controls 2_2 WAY WITH PRESSURE RELEASE SERIES 27 - Manual (Page 2)

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Pressure Controlled Pilot Operated Check Valves
Air pilot or solenoid pilot operated check valves with trapped pressure relief can be used to control
a pneumatic cylinder in several important ways. For example:
• Maintaining a cylinder (horizontal or vertical) in a stationary position upon loss of electrical power.
• Jogging a cylinder.
• Relieving pressure trapped between check valve and cylinder.
Correct installation of a dual check valve is essential. It should be mounted as close to the cylinder
as possible. Minimizing the air volume by keeping the air lines short will reduce cylinder “bounce,”
and help to give the best performance.
STANDARD SPECIFICATIONS: For valves on this page.
INTERNAL PILOT MODELS:
Ambient/Media Temperature: 40° to 175°F (4° to 80°C).
Inlet Pressure: 15 to 150 psig (1 to 10 bar).
SOLENOID PILOT MODELS:
Solenoids: AC or DC power.
Standard Voltages: 100-110 volts, 50 Hz; 100-120 volts, 60 Hz;
24 volts DC; 3-pin Mini and 4-pin Micro connectors.
Power Consumption: 8 VA inrush, 6 VA holding on AC; on DC 4.5
watts with 4-pin Micro connector, 60 watts with 3-pin connector.
Ambient Temperature: 40° to 120°F (4° to 50°C).
Media Temperature: 40° to 175°F (4° to 80°C).
Flow Media: Filtered air; 5 micron recommended.
Inlet Pressure: 30 to 150 psig (2 to 10 bar).
Signal Pressure: Must be equal to or greater than inlet.
Port Threads: NPT standard, BSPP. For BSPP threads add a “D”
prefix to the model number, e.g., D2778D3900.
Valve Port Valve Model Avg. C
V
Dimensions inches (mm) Weight
Type Size Number (Fully open) A B C lb (kg)
3/8 2751B3922 2.6 1.65 (41.9) 3.57 (90.6) 2.2 (55.9) 1.8 (0.8)
A
1/2 2751B4922 2.8 1.65 (41.9) 3.57 (90.6) 2.2 (55.9) 1.8 (0.8)
Remote 3/4 2751B5917 9.2 4.3 (110) 4.2 (107) 2.2 (56) 2.9 (1.3)
3/8 2751B3920 2.6 1.65 (41.9) 3.47 (88) 2.2 (55.9) 1.8 (0.8)
A
1/2 2751B4920 2.8 1.65 (41.9) 3.47 (88) 2.2 (55.9) 1.8 (0.8)
Manual 3/4 2751B5919 9.2 4.3 (110) 4.2 (107) 2.2 (56) 2.9 (1.3)
3/8 2768D3901 2.9 3.6 (91.4) 3.64 (92.4) 2.6 (66.1) 3.5 (1.6)
D 1/2 2768D4901 3.2 3.6 (91.4) 3.64 (92.4) 2.6 (66.1) 3.5 (1.6)
Remote 3/4 2768D5901 8.5* 4.98 (126.5) 4.24 (107.7) 3.4 (86.4) 5.2 (2.3)
1 2768D6901 8.5* 4.98 (126.9) 4.24 (107.7) 3.4 (86.4) 8.8 (4.0)
3/8 2768D3904 2.9 3.6 (91.4) 3.6 (91.4) 2.6 (66.1) 3.2 (1.4)
D 1/2 2768D4904 3.2 3.6 (91.4) 3.6 (91.4) 2.6 (66.1) 3.5 (1.6)
Manual 3/4 2768D5904 8.5* 4.8 (122) 4.24 (107.7) 3.4 (86.4) 5.2 (2.3)
1 2768D6904 8.5* 4.8 (122) 4.24 (107.7) 3.4 (86.4) 8.8 (4.0)
*Effective C
V
varies with load and pressure drop. Consult ROSS for specifics on your system.
B
A
C
B
A C
Type A Single
PO Check Valve
(Remote Trapped
Pressure Relief)
Ports: 3/8 through 3/4
B
A C
Type A Single
PO Check Valve
(Manual Trapped
Pressure Relief)
Ports: 3/8 through 3/4
B
A
C
Type D Internal Pilot Dual
PO Check Valve
(Remote Trapped
Pressure Relief)
Ports: 3/8 through 1/2
Type D Internal Pilot
Dual PO Check Valve
(Manual Trapped
Pressure Relief)
Ports: 3/8 through 1/2
Connector Wiring
DC Micro
Connector
B
A
C
24 volts DC 24 volts DC
Valve Port Avg. DIN 3-Pin Mini 3-Pin Mini 4-Pin Micro Dimensions inches (mm) Weight
Type Size C
V
Connector Connector Connector Connector A B C lb (kg)
3/8 2.9 2778C3900 2778C3901 2778C3902 2778C3904 3.60 (91.4) 5.67 (144) 2.60 (66.1) 4.0 (1.8)
E 1/2 3.2 2778C4900 2778C4901 2778C4902 2778C4904 3.60 (91.4) 5.67 (144) 2.60 (66.1) 4.2 (1.9)
3/4 8.5* 2778C5900 2778C5901 2778C5902 2778C5904 4.98 (126.5) 6.77 (172) 3.40 (86.4) 6.1 (2.8)
1 8.5* 2778A6900 2778A6901 2778A6902 2778A6904 4.98 (126.5) 6.77 (172) 3.40 (86.4) 6.1 (2.8)
*Effective C
V
varies with load and pressure drop. Consult ROSS for specifics on your system.
DIN
Connector
AC Mini
Connector
DC Mini
Connector
Type E Solenoid Pilot
Dual PO Check Valve
Ports: 3/8 through 1
WITH Trapped Pressure Relief Function
Solenoid Controlled Pilot Operated Check Valves
1
2
3
SOLENOID 1
2
3
SOLENOID
Common
+ 24VDC
1
2 3
SOLENOID
4
Common
+ 24 VDC
SOLENOID