Ross Controls 3-2 VALVES SERIES DM2 D User Manual
BULLETIN 505
BULLETIN 505
2
®
2
DM
DM
3/2 Double Valves
3/2 Double Valves
with Dynamic Monitoring &
Dynamic Memory
Kupplung/Bremse
Embreagem/Freio
®
Series D
Series D
クラッチ/ブレーキ
Iaktk@ xfrjks/kd
离合器/制动器
• Manufacturers of Premium Pneumatic Controls since 1921 •
DM
Table of Contents
2®
Series D Double Valves
General Information
Page 3 - 4
Ordering Information
Valve Dimensions
Overview of DM2® Series D
Double Valve
Flow Information
Operating Instructions
Repair Kits
Accessories
Cautions/Warranty
Page 5
Page 6 - 7
Page 8 - 9
Page 10 - 11
Page 12
Page 13
Page 14
Page 15
The Leader in Double Valve Design
ROSS has long been in the forefront of
double valve research and development.
For over 60 years ROSS has been responding to the needs of press manufacturers and
users by progressively improving double
valve technology. Internal flow patterns of
double valves developed by ROSS have
included series flow, parallel flow, combined
series-parallel tandem flow, and combined
series-parallel Crossflow
Monitoring devices have also been offered
in a variety of designs to satisfy differing
requirements. Traditionally, in order to
achieve complete monitoring capability,
it has been necessary to add devices or
components to the valve or to the control
system.
2 © 2010, ROSS CONTROLS. All Rights Reserved.
TM
.
The DM
monitor and the main valve components
into two identical piston-poppet assemblies.
Two piston-poppet assemblies provide
a redundant 3/2 normally closed air flow
pattern and the patented internal design
provides dynamic monitoring as well as
complete memory.
During valve operation air pressure acting
on changing combinations of assembly
surfaces cause the assemblies to move
to the required position. Force balances
in the valve assure positive shifting forces
during normal operation as well as a
positive force to hold the assemblies in a
locked-out position.
2®
Series D valve combines the
DM2® Series D Double Valves
The ROSS DM2® Series D double valves provide significant
features in response to the changing demands of the
mechanical press industry and its associated standards and
regulations regarding the control of pneumatically controlled
clutch and brake applications. The consensus requirements
of the regulations and good practices require that, in case of
a failure within the valve, the clutch and brake mechanisms be
quickly exhausted, a monitor takes action to prevent further
operation, and a method to alert personnel is incorporated.
These features also make the valve suitable for use in other
Category 3 & 4 safety-related applications.
2®
A ROSS DM
Series D double valve has two valve elements
independently controlled by two solenoid pilots. The two
valve elements share common inlet, outlet, and exhaust ports.
When the pilot valves are simultaneously energized, the valve
elements operate so that the valve functions as a 3/2 normally
closed valve.
If one of the valve elements does not open or close synchronously
with the other, the valve goes into a faulted condition, exhausts
downstream air and keeps residual outlet pressure to less than
1% of inlet supply. This is an important safety characteristic of
2®
the ROSS DM
Series D design.
DM2® Monitoring:
The DM
intermediate, lockout position) distinguished by CrossflowTM
passages with poppet and spool valving on the main valve
stems. This arrangement provides the valve’s outstanding
flow characteristics and an integrated monitoring capability
with total memory. The valve provides dynamic monitoring
and dynamic memory.
2®
is a patented 3/2 normally closed valve (with an
Valve element redundancy provides an additional safety factor,
as the likelihood of a malfunction in both valve elements in the
same cycle is considered extremely remote.
2®
valves also have an internal monitor that is integrated
DM
into the valve elements. Should the valve operate abnormally,
the monitor will lock-out the valve and prevent further operation
until corrective action is taken.
IMPORTANT NOTE:
Standards, regulations, and good practice all require that
mechanical power presses or other hazardous machines using
a pneumatically-controlled clutch and brake mechanism be
equipped with a double valve with a self-contained monitoring
device and/or an external monitoring system, which inhibits
further operation of the valve and machine in the event of a
failure within the valve. Of course, a double valve is just one
of the components in a press control system, and all other
elements of the system should be planned with safety as a
primary consideration.
Dynamic Monitoring means that all monitoring components
change state on every valve cycle. Should the valve elements
cycle asynchronously, the valve will exhaust downstream air
and lock-out, prohibiting further operation.
Dynamic Memory within a monitoring system indicates that
when a valve lock-out occurs, the valve will retain the fault
information regardless of air or electrical changes. The DM
2®
system can only be reset by a defined operation/procedure, and
will not self-reset (turning the valve off and on) or reset when
inlet air supply is removed and re-applied. Such automatic
resetting would conceal potential hazards from the operator.
Installation Example
2®
DM
Series D Double Valve
(Status indicator – optional)
Clutch and brake
combination
Lubricator
Volume
L-O-X
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Pressure gauge
®
- Valve
Filter and
water separator
Pressure regulator
DM
2®
Series D
Self Monitored - Clutch/Brake Control
Size 4
Double Valves with Total Dynamic
Monitoring & Complete Memory
For Size 2 Certifications
Approval Pending
Size 8
Size 12
Size 2
Valve Sizes: DM2® Series D double valves are available in 5 sizes, providing a
broad range of flow capabilities to meet your needs. For convenience, valves
are designated by the nominal sizes 2, 4, 8, 12, and 30 with outlet ports ranging
from 1/4” to 2”.
Simplified Schematic
Size 2, 4, 8, 12 and 30
• Dynamic Monitoring With Complete Memory: Memory, monitoring, and air
flow control functions are simply integrated into two identical valve elements.
Valves lock-out due to asynchronous movement of valve elements during
actuation or de-actuation, resulting in a residual outlet pressure of less than
1% of supply. Overt action is required for reset – cannot be reset by removing
and re-applying supply pressure. Reset can only be accomplished by remote
air signal, optional electrical solenoid reset signal, or optional manual reset.
• Basic 3/2 Normally Closed Valve Function: Dirt tolerant, wear compensating
poppet design for quick response and high flow capacity. Teflon back-up rings on
pistons to enhance valve endurance – operates with or without inline lubrication.
• Status Indicator (Optional): Includes a pressure switch with both normally
open and normally closed contacts to provide status feedback to the press
control system indicating whether the valve is in the lockout or ready-to-run
condition. The Status Indicator can be ordered installed or purchased separately
and added to any DM2® base.
• Silencers: All models include high flow, clog resistant silencers.
• Mounting: Base mounted – with BSPP or NPT pipe threads. Inlet and outlet
ports on both sides provide for flexible piping (plugs for unused ports included).
Captive valve-to-base mounting screws.
Size 12 and 30
• Intermediate Pilots: Increases pilot air flow for fast valve response, making it
possible to use the same size solenoids as valve sizes 2, 4 & 8, thereby reducing
electrical power requirements for these larger valves.
Size 30
4 © 2010, ROSS CONTROLS.
All Rights Reserved.
DM2® Series D Double Valves
HOW TO ORDER
(Choose your options (in red) to configure your valve model number.)
DM2D D A 4 2 A 1 1
PRODUCT
THREAD
BSPP ............................................. D
NPT ............................................... N
N/A (no base) ................................ X
REVISION LEVEL
BASIC SIZE
2......................................................2
4......................................................4
8......................................................5
12....................................................6
30....................................................8
BASE PORT SIZE
Size 2
1/4 inlet – 1/4 outlet ........................0
3/8 inlet – 3/8 outlet ........................1
Size 4
1/2 inlet – 1/2 outlet ........................2
1/2 inlet – 3/4 outlet ........................3
Size 8
3/4 inlet – 3/4 outlet ........................4
1 inlet – 1 outlet ..............................5
Size 12
1inlet – 1outlet ................................6
1inlet – 1½ outlet ............................7
Size 30
1½ inlet – 2 outlet ...........................8
Valve only (less base) ................. X
Valve Weight: Valve and base assembly
with status indicator and solenoid reset.
Size 2: 5.0 lb (2.3 kg).
Size 4: 6.0 lb (2.8 kg).
Size 8: 9.1 lb (4.2 kg).
Size 12: 15.5 lb (7.1 kg).
Size 30: 32.6 lb (14.8 kg).
STATUS INDICATOR
1......................................... YES
X ...........................................N O
RESET TYPE
1..................................REMOTE
2.............................. SOLENOID
4.................................. MANUAL
VOLTAGE
A ............................. 24 volts DC
B ........... 110 volts AC, 50/60 Hz
C** ........ 220 volts AC, 50/60 Hz
** 220 VAC not available in the U.S.
(OSHA regulations limit press control
voltage to no more than 120 volts AC).
BASE MODEL NUMBERS and
BASE SPECIFIC INFORMATION
Valve
Port Size Base Status Weight
Size Inlet Outlet Model Number*
2 1/4 1/4 1872C91 No 1.7 (0.8)
2 1/4 1/4 1873C91 Yes 2.1 (1.0)
2 3/8 3/8 1874C91 No 1.7 (0.8)
2 3/8 3/8 1875C91 Yes 2.1 (1.0)
4 1/2 1/2 1697C91 No 1.7 (0.8)
4 1/2 1/2 1698C91 Yes 2.3 (1.1)
4 1/2 3/4 1699C91 No 1.7 (0.8)
4 1/2 3/4 1700C91 Yes 2.3 (1.1)
8 3/4 3/4 1701C91 No 3.6 (1.6)
8 3/4 3/4 1702C91 Yes 4.2 (1.9)
8 1 1 1703C91 No 3.6 (1.6)
8 1 1 1704C91 Yes 4.2 (1.9)
12 1 1 1705C91 No 6.2 (2.8)
12 1 1 1706C91 Yes 6.8 (3.1)
12 1 1½ 1707C91 No 6.2 (2.8)
12 1 1½ 1708C91 Yes 6.8 (3.1)
30 1½ 2 1709C91 No 12.0 (5.4)
30 1½ 2 1710C91 Yes 12.6 (5.7)
*NPT port threads. For BSPP threads add a “D“ prefix to the
model number, e.g., D1872C91.
Indicator
lb (kg)
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