Ross Serpar 35 Series User manual

ROSS CONTROLS®
www.rosscontrols.com
douBle ValVes for ClutCh/BraKe Control
serPar® 35 series

www.rosscontrols.com
G2
35 Series SERPAR®valves are internally monitored double valves and are available in Size 4, 8, 12 and
30 ranging from 3/8” – 1½” port sizes. Internally monitored double valves contain a built-in monitoring
device that checks for the proper operation of each valve element. If the internal monitor detects a
valve fault on a particular cycle, the double valve will fail to a safe condition (all downstream air is
exhausted) and the monitor will lock-out to inhibit further operation of the device. Normal operation
can only be resumed by a momentary reset signal to the valve, either pneumatic or electric.
The original application for these double valves was in the control of clutch/brake mechanisms
on stamping presses, but they have found their way into many other critical applications such as
alternative lockout systems for energy isolation, air cylinder press load-holding systems, as well as
other Category -3 and -4 safety circuits. ROSS double valves are a vital part of any control-reliable
fluid power control system.
SERPAR®DOUBLE VALVES 35 SERIES DOUBLE VALVES WITH INTERNAL
MONITORING & LOCKOUT – KEY FEATURES
• Internal monitoring – requires no additional monitoring circuitry
• Automatic lock-out/inhibit upon detection of a malfunction
• Default to de-energized position upon fault detection
• Dedicated reset function
• No undesired automatic reset upon removal of electrical or pneumatic energy sources
• Built-in non-clogging silencers on Sizes 4, 8, 12 and 30
DESCRIPTION Page
SERPAR®Double Valves
with L-G Monitor
Size 4
G2.3 - G2.4
SERPAR®Double Valves
with L-G Monitor
Size 8, 12, 30
G2.5 - G2.6
SERPAR®Double Valves
with E-P Monitor
Size 8, 12, 30
G2.7 - G2.8
SERPAR®Double Valves
with D-S Monitor
Size 8, 12, 30
G2.9 - G2.10
G

G2.3
www.rosscontrols.com
IMPORTANT NOTE: Please read carefully and thoroughly all of the CAUTIONS, WARNINGS on the inside back cover.
Online Version
Rev. 05/16
ACCessories & options
Piping Flange Kits
Each kit includes two threaded (NPT)
flanges and the required seals and
mounting bolts.
YBYA 31
2
YC
YE
L(Lockout Indicator)
YD
Manual
Reset
COIL
ACOIL
B
Signal A Signal B
SERPAR®Double Valves
with L-G Monitor, Size 4
Port
Size
Basic
Size
Monitor
Reset
Model Number*CV Avg. Response Constants Weight
lb (kg)
Right Inlet Left Inlet M F
1-2 2-3 1-2 2-3
3/8 4 Manual 3573D3191** 3573D3195** 3.0 6.0 15 0.70 0.40 8.3 (3.7)
3/8 4 Remote 3573D3192** 3573D3196** 3.0 6.0 15 0.70 0.40 8.3 (3.7)
1/2 4 Manual 3573D4211** 3573D4215** 3.0 8.0 15 0.65 0.35 8.3 (3.7)
1/2 4 Remote 3573D4212** 3573D4216** 3.0 8.0 15 0.65 0.35 8.3 (3.7)
3/4 4 Manual 3573D5211** 3573D5215** 3.0 9.0 15 0.65 0.35 8.3 (3.7)
3/4 4 Remote 3573D5212** 3573D5216** 3.0 9.0 15 0.65 0.35 8.3 (3.7)
* NPT port threads. For BSPP threads, add a “D” prefix to the model number, e.g., D3573D3191W.
** Insert voltage code: “W” = 24 volts DC; “Z” = 110-120 volts AC, 50/60 Hz; e.g., 3573D3191W.
For other voltages consult ROSS.
STANDARD SPECIFICATIONS (for valves on this page):
Construction: Dual poppet.
Mounting Type: Inline.
Pilot Solenoids: Two, rated for continuous duty.
Standard Voltages: 24 volts DC; 110-120 volts AC, 50/60 Hz.
Power Consumption (each solenoid):30 VA inrush, 16 VA holding
on 50 or 60 Hz; 11 watts on DC.
Electrical Connections: Cord-grip connectors at solenoids.
Ambient Temperature: 40° to 120°F (4° to 50°C).
Media Temperature: 40° to 175°F (4° to 80°C).
Flow Media: Filtered air.
Inlet Pressure: 30 to 100 psig (2 to 7 bar).
L-G Reset Pressure: Remote pneumatic reset models require a
pressure of at least 30 psig (2 bar). Manual reset models use internal
valve pressure.
Inlet Port: Models are available with the inlet port on either the right
or the left side of the valve body.
Valve Without Silencer Exhaust port has threaded flange only, consult ROSS.
35 Series
Port Size Basic Size Kit Number
3/8 4 658K77
1/2 4 659K77
3/4 4 660K77
Valve Without Piping Flanges
Port
Size
Basic
Size
Monitor
Reset
Model Number*
Right Inlet Left Inlet
3/8, 1/2,
3/4 4Manual 3573D4241** 3573D4245**
Remote 3573D4242** 3573D4246**
RESET VALVES for L-G MONITOR
On valve models with manual reset a button on the side of the monitor is
pushed to perform the reset function. Models for remote reset, however,
require a small reset valve and the installation of a 1/8 line from the reset
valve to the reset port on the monitor.ROSS offers 3/2 normally closed valves
with either manual or electric control that are suitable for this purpose, valves
size 8, 12, 30 with L-G monitor are suggested.
Reset Valves
Description Model Numbers
Flush Pushbutton: Green 1223B1FPG
Mushroom Button: Green 1223B1MBG
Direct Solenoid Control for Line Mounting 1613B1020**
Direct Solenoid Control for Base Mounting W1413A1409**
(Base: 516B91)
Valve Response Time
The constants above, designated M and
F, can be used to determine the amount
of time required to fill or exhaust a volume
of any size using the formula on the right:
Vlv. Resp.Time (msec)= M + F *V
M = avg. time for parts movement
F = msec. per cubic inch of volume
V = volume in cubic inches
Pressure Switches
(Electrical Lockout Indicator)
G
G2
3
1
2
Normally
Closed
Normally Open
Ground
Common
Pin 1
Common
Pin 3
Not Used
Pin 2
Normally
Closed
Pin 4
Normally Open
DIN Connector Pinout M12 Connector Pinout
* NPT port threads. For BSPP threads, add a “D” prefix to the model number, e.g., D3573D4241W.
** Insert voltage code: “W” = 24 volts DC; “Z” = 110-120 volts AC, 50/60 Hz; e.g., 3573D4241W. For other voltages consult ROSS
Connection Type Model Number*Port Threads
DIN 43650 Form A 586A86 1/8 NPT
M12 Micro-DC 1153A30 1/8 NPT
*
Pressure switch closes on falling pressure of 5 psig (0.34 bar).

G2.4 © 2016, ROSS CONTROLS®. All Rights Reserved.
IMPORTANT NOTE: Please read carefully and thoroughly all of the CAUTIONS, WARNINGS on the inside back cover.
Online Version
Rev. 05/16
L-G Monitor Locked-out:
When the L-G spool shifts it is held by a lockout pin (not
shown). Pilot air is then exhausted to atmosphere via
port YB, and pilot supply air is diverted to atmosphere
via port YA. The lockout mechanism must be reset
before the valve can return to normal operation.During
and following reset, the pilot solenoids must be kept
de-energized to prevent inadvertent and possibly
dangerous cycling of the press. The reset function
is either manual or remote-pneumatic depending on
valve model.
Detecting a Malfunction:
A malfunction in the system or the valve itself could
cause one valve element to be open and the other
closed. Air then flows past the inlet poppet on
valve element A, into crossflow passage D, but is
substantially blocked by the spool portion of element
B. The large size of the open exhaust passage past
element B keeps the pressure at the outlet port below
two percent of inlet pressure. Full monitoring air
pressure from side A goes to the right end of spool
S, and a reduced pressure goes to the left end. This
pressure imbalance causes the spool to shift to the left.
This shuts off and exhausts pilot air to both solenoid
pilots, and allows valve element A to return to the
closed position.
Normal Operation:
Simultaneously energizing both
solenoids actuates both pilots and
causes valve elements A and B to
shift. Inlet 1 is then connected to
outlet 2 via crossflow passages
C and D. Exhaust 3 is closed.
Monitoring pressure signals go to
each end of spool S and become
equal to inlet pressure.
Conditions at Start:
Inlet 1 is closed to outlet 2 by both
valve elements A and B. Outlet 2 is
open to exhaust 3.Pilot air is ported
from inlet 1 and through the center
section of spool S to the normally
closed pilots Pa and Pb. Monitoring
pressure signals at both ends of
spool S are exhausted.
Both solenoids must be energized simultaneously to shift the valve; maintained signal required to keep valve shifted.
WARNING: If monitor must be reset, electrical signals to both solenoids must be removed to prevent the machine controlled by the
valve from immediately recycling and producing a potentially hazardous condition.
AB
1
3
2
S
Pb Pa
AB
1
3
2
CD
S
Pb Pa
A
B
1
3
2
CD
S
Pb Pa
AB
1
3
2
S
Pb Pa
YA YB
VALVE OPERATION
35 Series
Valve Technical Data & Operation
2.05
(52)
4.10 (104) 3.08
(78)
RIGHT
SIDE
LEFT
SIDE
1.41
(36) 2.80 (70)
2.50
(62)
Inlet or
outlet
port
5.10
(129)
8.00
(203)
1/8 Remote
pneumatic reset
port or manual
reset 0.31 (7.8)
2 places
6.10 (155)
7.30 (183)
6.70 (170)
SERPAR®Double Valves
with L-G Monitor
options
ELECTRICAL CONNECTORS
Electrical Connector
Form Electrical Connector Type
Cord
Length
meters (feet)
Cord
Diameter
Electrical Connector Model Number
Without
Light
Lighted Connector
24 Volts DC 120 Volts AC
DIN 43650 Form A Prewired Connector (18 gauge) 2 (6½) 6-mm 721K77 720K77-W 720K77-Z
DIN 43650 Form A Prewired Connector (18 gauge) 2 (6½) 10-mm 371K77 383K77-W 383K77-Z
DIN 43650 Form A Connector for threaded conduit
(1/2 inch electrical conduit fittings) – – 723K77 724K77-W 724K77-Z
DIN 43650 Form A Connector Only – – 937K87 936K87-W 936K87-Z
CAUTIONS: Do not use electrical connectors with surge suppressors, as this may increase valve response time when de-actuating the solenoids.
G2
G
Valve Dimensions – inches (mm)

G2.5
www.rosscontrols.com
IMPORTANT NOTE: Please read carefully and thoroughly all of the CAUTIONS, WARNINGS on the inside back cover.
Online Version
Rev. 05/16
Construction: Dual poppet.
Mounting Type: Inline.
Pilot Solenoids: Two, rated for continuous duty.
Standard Voltages: 24 volts DC; 110-120 volts AC, 50/60 Hz.
Power Consumption (each solenoid): 87 VA inrush, 30 VA holding
on 50 or 60 Hz; 14 watts on DC.
Electrical Connections: Uses terminal strip connectors.
Ambient Temperature: 40° to 120°F (4° to 50°C).
Media Temperature: 40° to 175°F (4° to 80°C).
Flow Media: Filtered air.
Inlet Pressure: 30 to 125 psig (2 to 8.5 bar).
L-G Reset Pressure: 60 psig (4 bar) minimum.
Z (Pneumatic Reset Port)
YB
YA
31
2
Lockout Indicator
1
Solenoid
A
234
Solenoid
B
Port
Size
Basic
Size
Model Number*CV
Avg. Response Constants Weight
lb (kg)
With Overrides Without Overrides M F
1-2 2-3 1-2 2-3
1/2 8 3573A4142** 3573A4162** 3.5 8.5 15 0.70 0.30 15.3 (6.9)
3/4 8 3573A5142** 3573A5162** 4.0 12 15 0.65 0.23 15.3 (6.9)
3/4 12 3573A5152** 3573A5172** 8.0 15 15 0.65 0.23 19.0 (8.6)
1 8 3573A6152** 3573A6172** 4.0 12 20 0.33 0.21 15.3 (6.9)
1 12 3573A6162** 3573A6182** 8.5 19 20 0.28 0.21 19.0 (8.6)
1¼12 3573A7162** 3573A7182** 9.0 21 20 0.28 0.21 19.0 (8.6)
1¼30 3573A7152** 3573A7172** 20 42 25 0.19 0.07 37.5 (16.9)
1½30 3573A8162** 3573A8182** 21 43 25 0.18 0.07 37.5 (16.9)
2 30 2 inch port size available on size 30 valves. Order part number 1999H77 flange kit separately.
* NPT port threads. For BSPP threads, add a “D” prefix to the model number, e.g., D3573A4142W.
** Insert voltage code: “W” = 24 volts DC; “Z” = 110-120 volts AC, 50/60 Hz; e.g., 3573A4142W.
For other voltages consult ROSS.
STANDARD SPECIFICATIONS (for valves on this page):
SERPAR®Double Valves
with L-G Monitor, Size 8, 12, 30 35 Series
Piping Flange Kits
Each kit includes two
threaded (NPT) flanges
and the required seals
and mounting bolts.
Port
Size
Basic
Size
Pipe Flange
Kit Number
1/2 8 661K77
3/4 8 662K77
1 8 663K77
3/4 12 664K77
1 12 665K77
1¼12 666K77
1¼30 667K77
1½30 668K77
Valve Without
Piping Flanges
Port Size Basic
Size
Model Number*
With
Overrides
Without
Overrides
1/2, 3/4, 1 8 3573A4202** 3573A4222**
3/4, 1, 1¼12 3573A5202** 3573A5222**
1¼, 1½30 3573A7202** 3573A7222**
RESET VALVES for L-G MONITOR
Models for remote reset, however, require a small reset valve and the installation
of a 1/8 line from the reset valve to the reset port on the monitor.ROSS offers 3/2
normally closed valves with either manual or electric control that are suitable for
this purpose, valves size 8, 12, 30 with L-G monitor are suggested.
Reset Valves
Description Model Number*
Flush Pushbutton: Green 1223B1FPG
Mushroom Button: Green 1223B1MBG
Direct Solenoid Control for Line Mounting 1613B1020**
Direct Solenoid Control for Base Mounting W1413A1409**
(Base: 516B91)
Valve ResponseTime The constantsabove,
designated M and F, can be used to determine
the amount of time required to fill or exhaust a
volume of any size using the formula on the right:
Vlv. Resp.Time (msec)= M + F *V
M = avg. time for parts movement
F = msec. per cubic inch of volume
V = volume in cubic inches
* NPT port threads. For BSPP threads, add a “D” prefix to the model number, e.g., D3573A4202W.
** Insert voltage code: “W” = 24 volts DC; “Z” = 110-120 volts AC, 50/60 Hz; e.g., 3573A4202W. For other voltages consult ROSS.
G
G2
ACCessories & options
3
1
2
Normally
Closed
Normally Open
Ground
Common
Pin 1
Common
Pin 3
Not Used
Pin 2
Normally
Closed
Pin 4
Normally Open
DIN
Connector
Pinout
M12
Connector
Pinout
Valve Without Silencer Exhaust port has threaded flange only, consult ROSS.
Pressure Switches
(Electrical Lockout Indicator)
Connection Type Model Number*Port Threads
DIN 43650 Form A 586A86 1/8 NPT
M12 Micro-DC 1153A30 1/8 NPT
*
Pressure switch closes on falling pressure of 5 psig (0.34 bar).

G2.6 © 2016, ROSS CONTROLS®. All Rights Reserved.
IMPORTANT NOTE: Please read carefully and thoroughly all of the CAUTIONS, WARNINGS on the inside back cover.
Online Version
Rev. 05/16
Both solenoids must be energized simultaneously to shift the valve; maintained signal required to keep valve shifted.
WARNING: If monitor must be reset, electrical signals to both solenoids must be removed to prevent the machine controlled by the valve
from immediately recycling and producing a potentially hazardous condition.
Basic Size 12
Basic Size 8
Basic Size 30
2.53
(64) 5.06 (128)
4.26 (106) 2.47
(63)
8.52 (216)
2.10
(53)
12.30
(312)
3.68
(93)
0.28 (7)
(4 places)
1.25
(32)
4.33
(110)
2.03
(52)
2.60 (66)
2.45 (62)
7.20 (184)
Port 2
(outlet)
1/8
Pneumatic
reset port
Port 1
(inlet)
1/2 NPSC
electrical
opening
1/8 Lockout
indicator port
2.09 (53)
1.69 (43)
2.75
(70) 5.50 (140)
4.48 (114) 2.47
(63)
8.96 (228)
3.00
(76)
13.80
(351)
4.08
(104)
0.34 (9)
(4 places)
1.81
(46)
5.22
(133)
2.40
(61)
3.00 (76)
2.45 (62)
8.60 (216)
Port 2
(outlet)
1/8
Pneumatic
reset port
Port 1
(inlet)
1/2 NPSC
electrical
opening
1/8 Lockout
indicator port
2.09 (53)
1.80 (46)
4.28
(109) 8.56 (217)
6.18 (157) 2.47
(63)
12.36 (314)
3.70
(93)
17.80
(451)
4.10
(104)
0.53 (13)
(4 places)
4.52
(115)
9.36
(238)
2.50
(64)
2.27 (58)
5.90 (150
)
3.02 (77)
11.10 (282)
Port 2
(outlet)
1/8
Pneumatic
reset port
Port 1
(inlet)
1/2 NPSC
electrical
opening
1/8 Lockout
indicator port
2.65 (67)
35 Series
Valve Technical Data & Operation
SERPAR®Double Valves
with L-G Monitor
L-G Monitor Locked-out:
When the L-G spool shifts it is held by a
lockout pin (not shown). Pilot air is then
exhausted to atmosphere via port YB, and
pilot supply air is diverted to atmosphere
via portYA.The lockout mechanism must be
reset before the valve can return to normal
operation. During and following reset, the
pilot solenoids must be kept de-energized to
prevent inadvertent and possibly dangerous
cycling of the press. The reset function
is either manual or remote-pneumatic
depending on valve model.
Detecting a Malfunction:
A malfunction in the system or the valve
itself could cause one valve element to be
open and the other closed. Air then flows
past the inlet poppet on valve element A,
into crossflow passage D, but is substantially
blocked by the spool portion of element B.
The large size of the open exhaust passage
past element B keeps the pressure at
the outlet port below two percent of inlet
pressure. Full monitoring air pressure from
side A goes to the right end of spool S, and
a reduced pressure goes to the left end. This
pressure imbalance causes the spool to shift to
the left. This shuts off and exhausts pilot air to
both solenoid pilots, and allows valve element
A to return to the closed position.
Normal Operation:
Simultaneously energizing both solenoids
actuates both pilots and causes valve
elements A and B to shift. Inlet 1 is then
connected to outlet 2 via crossflow passages
C and D. Exhaust 3 is closed. Monitoring
pressure signals go to each end of spool S
and become equal to inlet pressure.
Conditions at Start:
Inlet 1 is closed to outlet 2 by both valve
elements A and B. Outlet 2 is open to
exhaust 3. Pilot air is ported from inlet 1 and
through the center section of spool S to the
normally closed pilots Pa and Pb.Monitoring
pressure signals at both ends of spool S are
exhausted.
AB
1
3
2
S
Pb Pa
AB
1
3
2
CD
S
Pb Pa
A
B
1
3
2
CD
S
Pb Pa
AB
1
3
2
S
Pb Pa
YA YB
G2
G
VALVE OPERATION
Valve Dimensions – inches (mm)

G2.7
www.rosscontrols.com
IMPORTANT NOTE: Please read carefully and thoroughly all of the CAUTIONS, WARNINGS on the inside back cover.
Online Version
Rev. 05/16
During lock-out: Terminals 3 and 7 are connected which
allows a panel light, bell, or other electrical device to be wired
through terminals 7 and 3 to serve as a lockout indicator.
3
2
1
Single Input Wiring Diagram
123456789
ab
c
SOL INPUT
COM.
RESET
SOL
RESET
SOL
ab
c
12
3456789
RESET
SOL
RESET
SOL
SOL B
INPUT
COM. SOL A
INPUT
Dual Input Wiring Diagram
Port
Size Basic Size
Model Number*CV
Avg. Response
Constants Weight
lb (kg)
Single Signal Input Dual Signal Input
With
Overrides
Without
Overrides
With
Overrides
Without
Overrides 1-2 2-3 M F
1-2 2-3
1/2 8 3573A4141** 3573A4161** 3573A4341** 3753A4361** 3.5 8.5 15 0.70 0.30 11.8 (5.3)
3/4 8 3573A5141** 3573A5161** 3573A5341** 3573A5361** 4.0 12 15 0.65 0.23 11.8 (5.3)
3/4 12 3573A5151** 3573A5171** 3573A5351** 3573A5371** 8.0 15 15 0.65 0.23 15.5 (7.0)
1 8 3573A6151** 3573A6171** 3573A6351** 3573A6371** 4.0 12 20 0.33 0.21 11.8 (5.3)
1 12 3573A6161** 3573A6181** 3573A6361** 3573A6381** 8.5 19 20 0.28 0.21 15.5 (7.0)
1¼12 3573A7161** 3573A7181** 3573A7361** 3573A7381** 9.0 21 20 0.28 0.21 15.5 (7.0)
1¼30 3573A7151** 3573A7171** 3573A7351** 3573A7371** 20 42 25 0.19 0.07 35.0 (15.8)
1½30 3573A8161** 3573A8181** 3573A8361** 3573A8381** 21 43 25 0.18 0.07 35.0 (15.8)
230 2 inch port size available on size 30 valves. Order part number 1999H77 flange kit separately.
* NPT port threads. For BSPP threads, add a “D” prefix to the model number, e.g., D3573A4141W.
** Insert voltage code: “W” = 24 volts DC; “Z” = 110-120 volts AC, 50/60 Hz; e.g., 3573A4141W.
For other voltages consult ROSS.
STANDARD SPECIFICATIONS (for valves on this page):
Construction: Dual poppet.
Mounting Type: Inline.
Pilot Solenoids: Two, rated for continuous duty.
Standard Voltages: 24 volts DC; 110-120 volts AC, 50/60 Hz.
Power Consumption (each solenoid): 87 VA inrush, 30 VA holding
on 50 or 60 Hz; 14 watts on DC.
E-P Reset Solenoid: Rated for intermittent duty. Voltages: 24-48
or 100-120 volts AC or DC.
Ambient Temperature: 40° to 120°F (4° to 50°C).
Media Temperature: 40° to 175°F (4° to 80°C).
Flow Media: Filtered air.
Pressure Range: 30 to 125 psig (2 to 8.5 bar).
options
Piping Flange Kits
Each kit includes two threaded (NPT) flanges and the required seals and mounting bolts.
Valve Without Silencer Exhaust port has threaded flange only, consult ROSS.
Port Size Basic Size Kit Number
1/2 8 661K77
3/4 8 662K77
1 8 663K77
3/4 12 664K77
1 12 665K77
1¼12 666K77
1¼30 667K77
1½30 668K77
Valve Without Piping Flanges
Valve Response Time
The constants above, designated M and F, can be
used to determine the amount of time required to fill or
exhaust a volume of any size using the formula below:
Vlv. Resp.Time (msec)= M + F *V
M = avg. time for parts movement
F = msec. per cubic inch of volume
V = volume in cubic inches
SERPAR®Double Valves
with E-P Monitor 35 Series
Port Size Basic
Size
Model Number*
Single Signal Input Dual Signal Input
With Overrides Without Overrides With Overrides Without Overrides
1/2, 3/4, 1 8 3573A4201** 3573A4221** 3573A4301** 3573A4321**
3/4, 1, 1¼12 3573A5201** 3573A5221** 3573A5301** 3573A5321**
1¼, 1½30 3573A7201** 3573A7221** 3573A7301** 3573A7321**
* NPT port threads. For BSPP threads, add a “D” prefix to the model number, e.g., D3573A4201W.
** Insert voltage code: “W” = 24 volts DC; “Z” = 110-120 volts AC, 50/60 Hz; e.g., 3573A4201W. For other voltages consult ROSS.
G
G2

G2.8 © 2016, ROSS CONTROLS®. All Rights Reserved.
IMPORTANT NOTE: Please read carefully and thoroughly all of the CAUTIONS, WARNINGS on the inside back cover.
Online Version
Rev. 05/16
E-P Monitor Locked-out:
With both valve elements closed, monitoring
air pressure is exhausted from both ends of
spool S so that it returns to its normal position.
The electrical circuit to the pilot solenoids
remains broken by switch SW. To restore
the electrical circuit and return the valve to
normal operation, the reset solenoid (not
shown) must be briefly energized to reset
switch SW. During and following reset, the
pilot solenoids must be kept de-energized to
prevent inadvertent and possibly dangerous
cycling of the press. Prolonged energizing
of the reset solenoid can cause burnout and
nullify the reset function.
Detecting a Malfunction:
A malfunction in the system or the valve
itself could cause one valve element to
be open and the other closed. Air then
flows past the inlet poppet on valve
element A, into crossflow passage D, but
is substantially blocked by the spool portion
of element B. The large size of the open
exhaust passage past element B keeps
the pressure at the outlet port below two
percent of inlet pressure. Full monitoring air
pressure from side A goes to the right end of
spool S, and a reduced pressure goes to the
left end. This pressure imbalance causes
the spool to shift to the left. This trips switch
SW, breaks the electrical circuit to the pilot
solenoids, and allows valve element A to
return to the closed position.
Normal Operation:
Simultaneously energizing both solenoids
actuates both pilots and causes valve
elements A and B to shift. Inlet 1 is then
connected to outlet 2 via crossflow passages
C and D. Exhaust 3 is closed. Monitoring
pressure signals go to each end of spool S
and become equal to inlet pressure.
Conditions at Start:
Inlet 1 is closed to outlet 2 by both valve
elements A and B. Outlet 2 is open to
exhaust 3.Contacts of switch SW are closed.
Monitoring pressure signals at both ends of
spool S are exhausted.
AB
1
3
2
Pb Pa
SW
S
A
B
1
3
2
CD
Pb Pa
SW
S
AB
1
3
2
CD
Pb Pa
SW
S
AB
1
3
2
Pb Pa
SW
S
VALVE OPERATION
Basic Size 30
Basic Size 12
Basic Size 8
2.75
(70) 5.50 (140)
4.48 (114) 2.63
(67)
8.96 (228)
3.00
(76)
12.80
(324)
5.00
(127)
0.34 (9)
(4 places)
1.81
(46)
2.81
(71)
3.00 (76)
8.10 (206)
Port 2
(outlet)
Port 1
(inlet)
1/2 NPSC
electrical
opening
2.09 (53)
1.80 (46)
4.70
(118)
Port 2
(outlet) Port 1
(inlet)
1/2 NPSC
electrical
opening
2.53
(64) 5.06 (128)
4.26 (106)
8.52 (216)
2.10
(53)
11.40
(288)
0.28 (7)
(4 places)
1.25
(32)
2.44
(62)
1.80 (46)
2.60 (66)
7.20 (184)
1.70 (43)
2.63
(67)
4.28
(109) 8.56 (217)
6.18 (157) 2.63
(67)
12.36 (314)
5.90
(150)
17.30
(440)
5.10
(130)
0.53 (13)
(4 places)
4.52
(115)
2.91
(74)
2.09 (53)
3.70 (93)
11.10 (282)
Port 2
(outlet) Port 1
(inlet)
1/2 NPSC
electrical
opening 2.27 (58)
Completion of Normal Cycle:
Simultaneously de-energizing both solenoids returns the valve to the
“Conditions at Start” described above.
35 Series
Valve Technical Data & Operation
SERPAR®Double Valves
with E-P Monitor
G2
G
Valve Dimensions – inches (mm)

G2.9
www.rosscontrols.com
IMPORTANT NOTE: Please read carefully and thoroughly all of the CAUTIONS, WARNINGS on the inside back cover.
Online Version
Rev. 05/16
3
2
1
D-S MONITOR
Wiring Diagram
ABCDEFGHJK
ab
POWER
SOL.a
POWER
SOL.bMONITOR
POWER
RESET
SWITCH
FAULT
INDICATOR
D-S MONITOR
Port Size Basic
Size
Model Number*CV Avg. Response Constants
Weight
lb (kg)
With
Overrides
Without
Overrides MF
1-2 2-3 1-2 2-3
1/2 8 3573B4143** 3573B4163** 3.5 8.5 15 0.70 0.30 16.8 (7.6)
3/4 8 3573B5143** 3573B5163** 4.0 12 15 0.65 0.23 16.8 (7.6)
3/4 12 3573B5153** 3573B5173** 8.0 15 15 0.65 0.23 20.5 (9.2)
1 8 3573B6153** 3573B6173** 4.0 12 20 0.33 0.21 16.8 (7.6)
1 12 3573B6163** 3573B6183** 8.5 19 20 0.28 0.21 20.5 (9.2)
1¼12 3573B7163** 3573B7183** 9.0 21 20 0.28 0.21 20.5 (9.2)
1¼30 3573B7153** 3573B7173** 20 42 25 0.19 0.07 39.3 (17.7)
1½30 3573B8163** 3573B8183** 21 43 25 0.18 0.07 39.3 (17.7)
2 30 2 inch port size available on size 30 valves. Order part number 1999H77 flange kit separately.
* NPT port threads. For BSPP threads, add a “D” prefix to the model number, e.g., D3573B4143W.
** Insert voltage code: “W” = 24 volts DC; “Z” = 110-120 volts AC, 50/60 Hz; e.g., 3573B4143W.
For other voltages consult ROSS.
STANDARD SPECIFICATIONS (for valves on this page):
Construction: Dual poppet.
Mounting Type: Inline.
Pilot Solenoids: Two, rated for continuous duty.
Standard Voltages: 24 volts DC; 110-120 volts AC, 50/60 Hz.
Power Consumption (each solenoid): 87 VA inrush, 30 VA holding
on 50 or 60 Hz; 14 watts on DC.
D-S Monitor: Rated for same voltage as pilot solenoids.Power supply
to monitor must be independent and continuous.
Ambient Temperature: 40° to 120°F (4° to 50°C).
Media Temperature: 40° to 175°F (4° to 80°C).
Flow Media: Filtered air.
Pressure Range: 30 to 125 psig (2 to 8.5 bar).
options
Piping Flange Kits
Each kit includes two threaded (NPT) flanges and the required seals and mounting bolts.
Valve Without Silencer Exhaust port has threaded flange only, consult ROSS.
Port Size Basic Size Kit Number
1/2 8 661K77
3/4 8 662K77
1 8 663K77
3/4 12 664K77
1 12 665K77
1¼12 666K77
1¼30 667K77
1½30 668K77
Valve Without Piping Flanges Port Size Basic Size Model Number*
With Overrides Without Overrides
1/2, 3/4, 1 8 3573A4203** 3573A4223**
3/4, 1, 1¼12 3573A5203** 3573A5223**
1¼, 1½30 3573A7203** 3573A7223**
SERPAR®Double Valves
with D-S Monitor 35 Series
Valve Response Time
Theconstants above,designated Mand F, can beused todetermine theamount
of time required to fill or exhaust a volume of any size using the formula below:
Vlv. Resp.Time (msec)= M + F *V
M = avg. time for parts movement
F = msec. per cubic inch of volume
V = volume in cubic inches
* NPT port threads. For BSPP threads, add a “D” prefix to the model number, e.g., D3573A4203W.
** Insert voltage code: “W” = 24 volts DC; “Z” = 110-120 volts AC, 50/60 Hz; e.g., 3573A4203W. For other voltages consult ROSS.
G
G2

G2.10 © 2016, ROSS CONTROLS®. All Rights Reserved. Online Version
Rev. 05/16
Normal Operation:
Simultaneously energizing both solenoids
actuates both pilots and causes valve elements
A and B to shift. Inlet 1 is then connected to outlet
2 via crossflow passages C and D. Exhaust
3 is closed. Monitoring pressure signals go
to pressure indicators Ia and Ib, causing the
indicator pins to be extended and to actuate
proximity switches SWa and SWb. In normal
operation, each pair - solenoids, valve elements,
indicators, and proximity switches - responds in
unison so that the comparator circuits “read” the
operation as normal.
D-S Monitor Locked-out:
With the valve locked out by contacts Sa and
Sb, solenoids Pa and Pb cannot be energized.
The monitor must be reset before another valve
cycle can begin. Reset can be achieved by a
separately connected ancillary switch, but not if
the pilot solenoids are energized. The monitor
can be reset by removing and reapplying power
to the monitor even when the pilot solenoids
are energized. For this reason it is necessary
to have the pilot solenoids de-energized during
and following reset to prevent inadvertent and
possibly dangerous cycling of the press.
Detecting a Malfunction:
A malfunction in the system or the valve itself
could cause one valve element to be open
and the other closed. Air then flows past the
inlet poppet on valve element A, into crossflow
passage D, but is substantially blocked by the
spool portion of element B. The large size of the
open exhaust passage past element B keeps the
pressure at the outlet port below two percent of
inlet pressure. Full monitoring air pressure from
side A goes to pressure indicator Ia so that its pin
is extended and actuates proximity switch SWa.
When the time interval between the signal to a
solenoid and the signal from its corresponding
proximity switch exceeds approximately 175
milliseconds, the D-S monitor breaks contacts
Sa and Sb as soon as solenoid power is
removed. This allows valve element A to return
to the closed position.
Conditions at Start:
Inlet 1 is closed to outlet 2 by both valve
elements A and B. Outlet 2 is open to exhaust
3. Contacts of switch SW are closed. Monitoring
pressure signals at both ends of spool S are
exhausted.
A
B
1
3
2
CD
Ib Ia
COMPARATOR
and CONTROL
CIRCUITS
SWb SWa
Sb
Sa
Pb Pa
AB
1
3
2
Pb Pa
Ib Ia
COMPARATOR
and CONTROL
CIRCUITS
SWb SWa
Sb
Sa
AB
1
3
2
Pb Pa
Ib Ia
COMPARATOR
and CONTROL
CIRCUITS
SWb SWa
Sb
Sa
AB
1
3
2
CD
Ib Ia
COMPARATOR
and CONTROL
CIRCUITS
SWb SWa
Sb
Sa
Pb Pa
Basic Size 30
Basic Size 12
Basic Size 8
H
9.90
(252)
Port 2
(outlet)
Port 1
(inlet)
3/4
NPSC
electrical
opening
2.53
(64) 5.06 (128)
4.26 (106)
8.52 (216)
3.42
(87)
16.50
(418)
0.28 (7)
(4 places)
1.25
(32)
8.81
(224)
1.80 (46)
2.60 (66)
7.20 (184)
2.70 (69)
2.53
(64)
3.06 (78)
4.28
(109) 8.56 (217)
6.18 (157) 3.42
(87)
12.36 (314)
5.90
(150)
21.80
(553)
9.70
(245)
0.53 (13)
(4 places)
4.52
(115)
8.53
(217)
3.70 (93)
11.10 (282)
Port 2
(outlet)
Port 1
(inlet)
3/4
NPSC
electrical
opening
2.27 (58)
2.75
(70) 5.50 (140)
4.48 (114) 3.42
(87
8.96 (228)
3.00
(76)
17.80
(451)
10.30
(262)
0.34 (9)
(4 places)
1.81
(46)
9.18
(2.33)
3.00 (76)
8.10 (206)
Port 2
(outlet)
Port 1
(inlet)
3/4
NPSC
electrical
opening
2.70 (69)
1.80 (46)
Completion of Normal Cycle:
Simultaneously de-energizing both solenoids returns the valve to the
“Conditions at Start” described above.
35 Series
Valve Technical Data & Operation
SERPAR®Double Valves
with D-S Monitor
G2
G
VALVE OPERATION
Valve Dimensions – inches (mm)