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Solenoid Valves for Pneumatic Controls

Solenoid Valves for Pneumatic Controls

 

Photo of an RGS intrinsically safe solenoid valve for pneumatic control systems

Provide Safe Operation in Hazardous Locations and Extreme Environments

“EP” Series Solenoid Valves

  • Intrinsically safe, non-incendive, flameproof, and general purpose versions
  • Sizes from 1/8″ to 1″
  • 2, 3 & 4-way functionality
  • Single and dual solenoid actuators
  • Low power consumption
  • Optional materials of construction
  • NAMUR, CNOMO, manifold, body ported and remote mounting options

A minimum of moving parts and simplicity of design results in long term, trouble free operation. A low power solenoid assembly provides direct action in the 1/8″ models, and is used as a servo in the larger pilot operated versions — in piloted models air pressure is applied to a sliding spool which opens and closes the pneumatic control ports. Some of the coils meet intrinsic safety codes — see specifications below.

Our spool design features low-friction operation within annular seals. It has a self-cleaning wiping action to minimize the effects of potentially contaminated air. This contrasts with other competitive designs which have delicate sealing surfaces, plus many intricate parts. Size for size, this efficient design makes for some of the highest flow ratings in the industry.

Mark of Factory Mutual approvalMark of certification to ATEX Directive 94/9/EC

Flow Capacity
Nominal Valve Size
1/8″
1/4″
1/2″
1″
Cv Factor
0.4
1.2
3.5
10
Flow Rate*
litres/min.
382
1,246
3,534
10,384
s.c.f.m.
13.5
44
125
367
*at 90psig air supply, and 15psig pressure drop across the valve
Mechanical Specifications (typical)
Working Pressure Direct-acting models: 0-120 psig
Pilot-operated models: 45-120 psig
Ambient Temperature -4 to +176°F / -20 to +80°C except where upper limit is dictated by hazardous location certification.
Body Material Standard: black anodized aluminum alloy.
Options: 316 stainless steel, brass.
Spool Material Standard: hard anodized aluminum, PTFE impregnated.
Option: 316 stainless steel.
Seal Material Standard: nitrile.
Options: silicon, fluorosilicon, natural rubber or styrene for low temperature operation down to -40°F (-40°C), viton for high temperature operation on certain models.
Spacer Material Glass filled acetal
Spring Material Stainless steel
Pilot Jet Material Standard: brass; Option: stainless steel
Pipe Threads NPT, BSP
Coil Housing Rated NEMA4X / IP65, materials application dependent.
NEMA7 / IP66 options available in some cases.
Cable Entry Standard: M20 thread. Options: 1/2″ NPT thread, or 1/2″ NPT adapter to fit M20 thread on terminal box type coils.
Electrical Specifications (typical)
Standard Operating
Voltages
24, 110, 230V AC 50/60Hz; 24V DC
Others available by request.
Voltage Tolerance +/-10%
Coil Rating Class F rated coil with Class H rated wire
Power Consumption 0.4 to 5W, application dependent.
Wire Termination Flying leads, screw terminals, plug & socket (may be application specific).
Hazardous Location Certifications
(Confirm for specific valve configurations)
North America
Global
FM: intrinsic safety,
CFM: intrinsic safety.
ATEX: EEx ia, EEx ia (10mA), EEx d, EEx m, EEx me, EEx nA
CEPEL INMETRO: Ex d
IECEx: Ex d, Ex ia
SAA: intrinsic safety
GOST: Ex d

Coil assemblies

Coil assemblies are available to meet different applications. However, valves for use in hazardous locations usually require a specific coil assembly chosen during the approval or certification proces and this will often dictate the operating voltage. The most common choices are listed below — consult Exloc for others.

Code
Application
Style
Alternative
P
General purpose, plug & socket
1
 S
B
General purpose, terminal box
4
Style 3, stainless steel
U
Intrinsically safe, FM (USA)
4
Style 3, stainless steel
V
Intrinsically safe, CFM (Canada)
4
 S
A
Intrinsically safe, ATEX EEx ia
4
Style 3, stainless steel
W
Intrinsically safe, SAA (Australia) EEx ia
4
 S
D
Flameproof, Ex d
3
 S
9
Encapsulated, ATEX EEx m, EEx me
2
 S
N
Non Incendive (Type N), ATEX EEx nA
4
Style 3, stainless steel
Style 1
Zinc alloy with epoxy coating.
GRP connector.
Rated IP65/NEMA4.
Style 2
Zinc alloy with epoxy coating. Integral cable.
Rated IP65/NEMA4.
Style 3
Stainless steel with epoxy coating. Threaded entry.
Rated IP66/NEMA4X.
Style 4
Zinc alloy with epoxy coating. Threaded entry.
Rated IP65/NEMA4.
Valve Functionality
U.S.
Convention
Euro
Convention
Description
2-WAY
2/2
Two port, two position. Simple on-off function. This is not a common requirement in pneumatic control applications. If it is required, select a 3/2 valve type and plug the exhaust port.
3-WAY
3/2
Three port, two position. Most commonly used with single-acting spring-return cylinders to alternatively apply and exhaust air pressure.
4-WAY
2-position
5/2
Five port, two position. Used with double-acting cylinders required to take up one of two extremes of travel under air pressure.
4-WAY
3-position
5/3
Five port, three position. Used with double-acting cylinders required to be driven to one of two extremes of travel or be held in mid-position. There are two sub-designs in this category which permit exhaust air to be either held or released in mid-position.

Valve Selection Guide & Ordering Codes

REMOTE MOUNTING VALVES: 3-way (3/2) valve codes

3-way (3/2) valves have a single pressure port for connection to an air cylinder or actuator, an air supply port, and an exhaust port. Both single and dual solenoid designs are available. The pilot operated versions may be built with an internal pilot air passage from the main air supply port (most common), or with an external pilot air connection.

Valve Function Code for
Pilot Operated Valves
characters 4 & 5
Normally-closed versions shown. Ask us for normally-open codes.
Spring Return
Internal Pilot
Spring Return
External Pilot
Dual Solenoid
Internal Pilot
Dual Solenoid
External Pilot
18
80
19
90

REMOTE MOUNTING VALVES: 4-way, two-position, (5/2) valve codes

4-way, two-position, (5/2) valves have two pressure ports for connection to double-acting air cylinders and actuators, two exhaust ports, and a common air supply port. Both single and dual solenoid designs are available. Pilot operation is accomplished with an internal air passage from the main air supply port, or alternatively with an external pilot air connection(s).

Basic Valve Build Code
characters 1, 2, & 3
1/8″
1/4″
1/2″
1″
E15
E25
E45
E85
Valve Function Code
characters 4 & 5
Spring Return
Internal Pilot
Spring Return
External Pilot
Dual Solenoid
Internal Pilot
Dual Solenoid
External Pilot
18
80
19
90

REMOTE MOUNTING VALVES: 4-way, three-position, (5/3) valve codes

4-way, three-position, (5/3) valves have two pressure ports for connection to double-acting air cylinders and actuators, two exhaust ports, and a common air supply port. They employ dual solenoids, and have spring return to center with a choice of exhaust port status in the mid-position as shown in the schematics below. Pilot operation is accomplished with an internal air passage from the main air supply port, or alternatively with an external pilot air connection(s).

Basic Valve Build Code
characters 1, 2, & 3
1/8″
1/4″
1/2″
1″
N/A
E25
E45
E85
Valve Function Code
characters 4 & 5
All ports sealed in mid-position.
Internal Pilot
All ports sealed in mid-position.
External Pilot
Inlet sealed and
exh. ports open
in mid-position.
Internal Pilot
Inlet sealed and
exh. ports open
in mid-position.
External Pilot
14
40
15
50

SUB BASE MOUNTED SOLENOID VALVES

Most of the remote mounting valves detailed above are available for mounting on a sub-base which becomes the termination point for piping. The valve proper can then be removed from the sub-base without breaking the pipe connections. An air shut off valve is incorporated into the sub-base for this purpose. For stand-alone valves using this option specify Valve Body Style Code T.

MANIFOLD MOUNTED SOLENOID VALVES

Multiple valves mounted on sub-bases can be bolted together to create a manifold with common air supply and exhaust connections. Pipework is reduced, and space saved. Main air supply and exhaust ports are duplicated at each end of the manifold for convenience, and are sized appropriately. Provision to add valves to expand a system can be made at the outset by including extra sub-bases fitted with blanking plates. Banks of up to ten valves are possible. Specify Valve Body Style Code V and the number of valves to be ganged together.Example shows three Model E2318 valves manifold mounted.

‘NAMUR’ DIRECT-MOUNT SOLENOID VALVES

These valves conform to the NAMUR standard for direct mounting to air actuators. The flange interface provides for dimensions and location of airways and fixing holes between the solenoid valve and the actuator. The included mating seal plate enables the valve function to be switched between 3-way and 4-way (3/2 and 5/2). Thus, one valve model may be stocked for these alternative functions. Consult with Exloc for your NAMUR valve requirements…

‘CNOMO’ DIRECT-MOUNT SOLENOID VALVES

We can also supply solenoid valves engineered to the CNOMO standard for direct mounting to actuators.