30 Series - This range of valves operate using a pneumatic pilot and a spring return.  Pressure of up to 8bar(g) is applied to the pilot port of the valve (1/8"BSP).  The valve will then change position.  When the pilot pressure is relieved a strong steel spring will return the valve to it's original position.   These valves are manufactured from a solid Aluminium billet (anodised) and a stainless steel spool.  Over sized orifices are standard on these valves for maximum flow performance.  Port sizes up to 1"BSP.

16 Series (3/2) & 20 Series (2/2) - These valves are direct acting with a solenoid.  When power is applied to the solenoid via a coil (supplied) the valve will change position.  When power is removed from the coil the internal spring will return the valve to it's original position.  Over sized orifices are standard on these valves for maximum flow performance.  Port sizes up to 2"BSP(2/2) and 1/2"BSP (3/2).

10 Series - These valves are solenoid / spring return.   The valve requires a continuous pneumatic pressure on the pilot port to operate.   When power is applied to the solenoid via a coil (supplied) the pneumatic pilot changes the spool position.  When power is removed from the coil the internal spring will return the spool to it's original position.  Over sized orifices are standard on these valves for maximum flow performance.  Port Sizes up to 2" BSP.

50 Series - These valves are the same as the 10 series above but have two solenoids instead of one.  This safety feature means that the valve has to receive a positive signal to either of the solenoids for the valve to change position.  This feature is paramount in material lifting applications.  Over sized orifices are standard on these valves for maximum flow performance.  Ports sizes up to 2"BSP.

40 Series - These valves are servo assisted by means of using the differential pressure between the vacuum pump line and atmosphere to change the internal diaphragm position.  Like the other valves the have over sized orifices for maximum flow performance but do not require an external pneumatic pilot like the 10 and 50 series valves to operate.  Port sizes up to 2"BSP.

DDN Series - These valves are for vacuum/pressure applications such as autoclaves and other curing processes.  They are able to take both full vacuum and up to 3bar(g) pressure.  Ports sizes up to 1"BSP.

Vacuum Check Valves - Unlike pressure check valves these units have a very low 'break' pressure to ensure accurate and reliable operation in vacuum systems.   Port sizes up to 2"BSP.