
2(A)
3
R
3
R
1(P)
P1
P2
Throttle Main valve Valve 1 Valve 2
Soft start-up
valve
Safety limit
switch
Safety limit
switch
Soft start-up
valve
Made by Rockwell Automation
Made by OMRON
Soft start-up valve: ON
Valve 1, Valve 2: ON
Output pressure P2
Time
P1
1/2P
1
0
Soft start-up valve: OFF
Valve 1, Valve 2: ON
P
2
reaches half of P
1
, and
then the main valve of the
soft start-up valve turns on.
Start supplying flow ad-
justed air with the throt-
tle by energising valve
1 and valve 2.
Output Pressure (P2) vs Time Graph
The detecting function of the main valve position detects a
mismatch between the input signal and valve operation.
Category 2 Safety function can be accomplished by single channel and is automatically
checked.
Category 3 It has redundancy so there is no loss of safety function with a single failure.
The safety function must be checked before each use. An accumulation of
undetected faults can cause loss of safety function.
Category 4
It has redundancy so there is no loss of safety function with a single failure. The
safety function must be checked before each use. An accumulation of undetected
faults does not affect the safety function. (Higher DC and MTTFd than Category 3.)
Residual pressure release valve
With Detection of Main Valve Position (Category 2)
Input equipment (I): Detection equipment (sensor) of starting event
Logical operation equipment (L): Relay sequence circuit, PLC control program
Output equipment (O):
Solenoid valve, Electromagnetic switch, Output relay
Recommended valve: VP542/742-X536
Input equipment (I1, I2):
Detection equipment (sensor) of starting event
Logical operation equipment (L1, L2): Relay sequence circuit, PLC control program
Output equipment (O1, O2):
Solenoid valve, Electromagnetic switch, Output relay
Recommended valve: VP544/744-X538, VG342-X87
Output signal
Monitoring
Output signal
Input signal
I
Input equipment
O
Output equipment
OTE
Output of test result
L
Logical operation
equipment
TE
Testing equipment
When the dual residual pressure release valve is used, if one of the
valves fails to operate, the other one releases residual pressure.
Redundant system can be constructed easily. (Category 3, 4)
Output signal
Output signal
Monitoring
Monitoring
Cross monitoring
Input signal
Input signal
I1
Input equipment
I2
Input equipment
O1
Output equipment
O2
Output equipment
L1
Logical operation
equipment
L2
Logical operation
equipment
With soft start-up function (-X555/X585)
Safety limit switch can be selected.
Safety limit switch
Main valve Rod
VP544-X538
VP542-X536
Residual pressure release valve w
∗This product is component which is a part of a safety system and safety equipment is not guaranteed by this single unit alone.
VP544-X555
VP544-X585
Residual pressure
release valve q
쐌
A function to gradually increase the initial pressure
of the pneumatic system has been added to the dual
residual pressure release valve.
쐌
Fixed orifice and variable throttle are available as a throttle
for adjusting the pressure increase. (Ø 1, Ø 1.5,
Ø 2)
Conduit (VP series only) and
M12 connector (4 pin) types
are available.
M12 connector with 6 pins is
available.
qThe main valve position is detected by transferring the
main valve movement directly to the reed safety limit switch
with the rod.
wLong service life: B10d: 10 million times∗
eThe return spring releases the residual pressure securely
regardless of pressure level.
∗For VP첸-X536/X538/X555, safety limit switch made by OMRON
Highly reliable construction
1
3 Port Solenoid Valve/Residual Pressure Release Valve with Detection of Main Valve Position Series VP/VG
Safety Standard ISO 13849-1 Certified