2/2 Coax Solenoid

2/2 way coaxial solenoid valve range.

Process and Design Engineers can choose any 2-way coaxial solenoid valve according to the system maximum pressure limits, thread or flange size, orifice flow rate, seal type, body 2/2 way solenoid coax valvematerial and sealing options thus providing the best cost effective solution to match the application at hand.

Choosing the model according to port size required or existing pipe size and type, pressure rating, orifice size according to required flow, seal and body material according to media.

Below are examples of the more popular 2/2 way coax solenoid valves, all have options for normally closed or normally open. Stated maximum pressures shown are according to maximum inlet pressure however coaxial valve can handle back pressures at reduced rates typically 16 bar maximum, models with X denote sub base mounted valves and ATEX hazardous area valves.

Special options available: (03) PTFE sealing, (08) Manual Over Ride, (12) Vacuum Version, (15) Mounting Brackets, (10) Oil and Grease Free, (19) Position Feed Back, (29) Metal Terminal Box, (20) Connector with LED, (07) Special Connection, (06) Special Voltage.

You can view a typical technical data sheet here...

Basic Principle

How 2/2 coaxial solenoid valves work.

Valve working basics.

2/2 coaxial solenoid valve normally closed

2/2 normally closed coaxial solenoid valve

Pressure:Flow P to A Maximum pressure

Flow A to P 16 Bar

2/2 normally closed coaxial solenoid valve

Fail safe Closed - No Flow

2/2 normally closed coaxial solenoid valve- powered open

Energised Open - Full Flow

2/2 coaxial solenoid valve normally open

2/2 normally open coaxial solenoid valve

Pressure: Flow P to A Maximum

Flow A to P 16 Bar

2/2 normally open coaxial solenoid valve

Fail-safe Open - Full Flow

2/2 normally open coaxial solenoid valve powered closed

Energised Closed - No Flow

Normally Closed Function

How a Coaxial 2/2 way normally closed solenoid valve works.

symbol for 2/2 way normally closed

2/2 way normally closed symbol

The coaxial valve is in the fail-safe closed state.

This direct acting valve is in the rest or fail-safe position, with the control tube (2) through which the media (Blue) will flow and is pressed by a compression spring (3) into the valve seat (1). The coaxial valve is in the closed state - no flow.

2/2 way normally closed coax valve - closed position

The coaxial valve is in the energised open state.

This direct acting valve is in the energised position, by energising the electro magnet (4) such as 24vdc, 24vac, 110vac, 230vac etc, an electromagnetic field is generated which moves the control tube (2) in an axial direction away from the valve seat (1) and so opens the flow passage. Due to the axial movement of the tube (2) a compression spring (3) is compressed.

When the electrical supply is removed and the electro magnet de-energised (4), the compressed spring (3) pushes against the control tube (2) back into ins initial position against the valve seat (1). The coaxial valve is again closed and there is no flow of media.

2/2 way normally closed coax valve - open position

Normally Open Function

How a Coaxial 2/2 way normally open solenoid valve works.

symbol for 2/2 way normally open2/2 way normally open symbol

The coaxial valve is in the fail safe open state.

In the fail-safe rest position, the control tube (2) through which the media (blue) flows, has the compression spring (3) mounted on the right hand side, keeping the tube (2) away from the seat seal (2), allowing the flow of media through the valve.

2/2 way normally open coax valve - open position

The coaxial valve is in the energised closed state.

With electrical power to the solenoid magnet (4) of an applied voltage 24vdc or 230vac etc, an electromagnetic field is generated, which pulls the control tube (2) in an axial direction against the valve seal (1) and thus closes the passage preventing the flow of media. At the same time the tube (2) compresses the spring (3) further.

With electrical power removed and the electro magnet (4) without power to generate electro magnetic field, the compression spring (3) pushes the control tube (2) back to its fail safe (original) position away from the valve seat (1). The valve opens again.

 

2/2 way normally open coax valve - closed position

Technical Data Sheets

Click on the links below for the full PDF technical data sheets.
ModelMax Pressure BarPort SizesPort TypeOrifice Sizes (mm)Body MaterialSealing
266 100 1/8, 1/4"  BSP, NPT Thread 2,3,4,5,6 Brass or Galvanised Steel PTFE
267 300 1/8, 1/4, 3/8"  BSP, NPT Thread 1,2,2.5,3,4,5,6 Galvanised Steel or Nickel Plated Steel FKM
269 20 1/4, 3/8, 1/2, 3/4, 1, 11/4,  11/2"  BSP, NPT Thread or flange 10,15,20,25,32 Brass,AISI303 or 316 Stainless FKM,NBR,EPDM
270 40 1/4, 3/8, 1/2, 3/4, 1, 11/4, 11/2, 2" BSP, NPT Thread or flange 10,15,20,25,32,40,50 Brass AISI303 or 316 Stainless,Galvanised or Nickel Plated Steel FKM,NBR,EPDM
270X 40 1/4, 3/8, 1/2, 3/4, 1, 11/4, 11/2"  Manifold 10,15,20,25,32 Brass AISI303 or 316 Stainless,Galvanised or Nickel Plated Steel FKM,NBR,EPDM
271 64 1/4, 3/8, 1/2, 3/4, 1, 11/4, 11/2" BSP, NPT Thread or flange 10,15,20,25,32 Brass,AISI303 or AISI316 Stainless, Galvanised or Nickel Plated Steel FKM,NBR,EPDM,PTFE
271X 64

1/4, 3/8, 1/2, 3/4, 1, 11/4, 11/2"

Manifold  10,15,20,25,32 Brass,AISI303 or AISI316 Stainless, Galvanised or Nickel Plated Steel FKM,NBR,EPDM,PTFE
272 100 1/4, 3/8, 1/2, 3/4, 1, 11/4, 11/2" BSP, NPT Thread or flange 10,15,20,25,32 Brass,AISI303 or AISI316 Stainless, Galvanised or Nickel Plated Steel FKM,NBR,EPDM,PTFE
272X 100 1/4, 3/8, 1/2, 3/4, 1, 11/4, 11/2" Manifold  10,15,20,25,32 Brass,AISI303 or AISI316 Stainless, Galvanised or Nickel Plated Steel FKM,NBR,EPDM,PTFE
290 ATEX 20 1/4, 3/8, 1/2, 3/4"  BSP, NPT Thread 10,15 Brass,AISI303 or AISI316 Stainless FKM,NBR,EPDM
290X ATEX 20 1/4, 3/8, 1/2, 3/4" Manifold 10,15 Brass,AISI303 or AISI316 Stainless FKM,NBR,EPDM

2/2 Coaxial solenoid valve orifice sizes and flow rates.

Coaxial solenoid operated valves are available with a range of orifice sizes for each port connection size. The orifice is the internal diameter of the stainless steel tube where the media flows along, hence the bigger this orifice or internal tube diameter the higher the flow coefficient or flow rate for the coaxial valve and of course the larger the surrounding valve body needs to be to accommodate this. Valve users can choose from a range of orifice sizes to suit their flow requirements for each chosen port size, such as 1/2" port would typically be available with 10mm or 15mm orifice and 3/4 port available with 10mm, 15mm and 20mm orifice, although there are logical limitations due to the port size of choice. For example choosing a large orifice with a very small port connection would be inhibitive as the flow restriction of the smaller port exceeds the flow capability of the orifice or tube hence making the additional cost of a larger tube and valve body uneconomical and of no additional benefit in terms of increased flow.

2/2 Coaxial solenoid valve control voltages.

Coaxial solenoid actuated valves require a control voltage or electrical signal to operate. The design of the coaxial valve creates a small challenge for AC or alternating voltages 50/60Hz as the coaxial valve design is unable to incorporate a shading ring which is commonly found is general solenoid valve design to prevent the humming or buzzing noise sometimes attributed to AC voltage supply. In the case of solenoid operated coaxial valves this has been over come by utilising a DC coil only, with AC voltages converted to DC (Direct current) be means of a full bridge rectified electrical DIN connector. Coax valve users are then able to supply their coaxial valve with 230vAC 50/60Hz electrical supply with the rectified connector converting this to 230vDC. Standard coax valves are supplied either 24vDC or 230vAC (Rectified) with other options for 12vDC, 48VDC and 24vAC (rectified to 24vDC), 48vAC (rectified to 48vDC), 110vAC (rectified to 110VDC), with typically most other specialised voltages made to order.

Valve Options

Coax solenoid valves are available with a range of additional options to increase suitability for individual applications. Below we have detailed some of the more common options, however there is typically a vast additional range of custom options that most manufacturers can accommodate.

Mounting Brackets.

To secure the valve body into place.

Coax mounting brackets 

Manual Over Ride.

Allows for manual actuation of the valve.

 Coax valve manual over ride

Position Feed Back Switches, Open, Closed or Open and Closed volt free position switches.

Allows for remote signal confirmation of valve in open, closed or open and closed positions.

 Coax valve with position feed back switches

DIN 43650A Form A Electrical connector with LED.

LED light is ON when power is applied to the electrical connector.

 Coax valve with LED electrical connector
DIN 43650A Form A Electrical connector with M12x1mm electrical connection.  Coax valve with M12x1 electrical connector

DIN 43650A Form A power saving connector.

Electrical connector with PWM (Pulse Width Modulation) gives adjustable 11% to 89% power reduction after initial inrush current. Reduces power consumption and reduces heat build up. when fitted at factory connector will be installed and set up for optimal performance.

Coax valve with power saving connector

 flanged coaxial solenoid valves

270 Series Pressures: 0 - 40 Bar Flange Sizes DN10 - DN50

271 Series Pressures: 0 - 64 Bar Flange Sizes DN10 - DN40

272 Series Pressures: 0 to 100 Bar Flange Sizes DN10 - DN40

Flange Options:

F1 - PN16, F2 - PN40, F5 - PN100