a multilayer printed circuit board which may contain a printed actuator coil for one or more additional actuators and or electronic circuitry such as may be used for control of the actuator application_number US 83717210 A description first referring to fig1 a cross section of a spool poppet valve in accordance with an embodiment of the present invention may be seen the valve shown is a three way valve in that it may connect a control port c to a supply port s or to a vent port v the valve includes a housing 20 and cap 22 both of which are of magnetic materials and an end cap 24 which may or may not be fabricated of a magnetic material located within the housing 20 is a spool 26 having a poppet valve 28 at the left end thereof with a coil spring 30 encouraging the spool and poppet valve to the right position as shown in this position the control port c is coupled to the vent port v with the poppet valve being firmly seated on seat 32 on the housing to seal the high pressure fluid in the source port s from the control port c at the right end of spool 26 is a magnetic armature 28 urged against end 34 of the spool by a pressure balance piston 36 the right end of which is also subjected to the fluid pressure of the supply s the diameter of the pressure balance piston 36 is the same as the outer diameter of the spool 26 thus substantially equal to the inner diameter of the housing 20 and cap 22 this coupled with the fact that the angle of the valve seat 32 is slightly greater than the angle of the poppet valve.