signal or pneumatic pressure to affect the trigger of the actuator 16 the actuator 16 is operative to ignite a combustible material 5 that is disposed in the combustion chamber 22 examples of combustible material 5 include propellants such as black powder a solid explosive and a combustible liquid gas or gel the deflagration of the combustible material 5 increases the pressure in the combustion chamber 22 and generates a force indicated by the arrow 7 the force is sufficient to release the release member s 26 of fig1 once the member s 26 are released the communication piston 24 moves along the longitudinal axis of the piston housing 18 the orifice s 34 aligns with the ports 32 of fig1 when the communication piston 24 travels to a stopping point in the piston housing 18 the alignment of the orifice 34 with the ports 32 opens the valve assembly 10 and allows the flow of fluid through the orifice 34 and ports 32 in operation a plurality of valve assemblies 10 may be used it is desirable for the initiator portion 3 to trigger the actuator 16 of each of the plurality of valve assemblies prior to the combustion of the combustible material 5 the actuator 16 may include for example a mechanical electrical or chemical time delay portion thus the actuator 16 may delay the ignition of the combustible material 5 for a defined time period following the trigger of the actuator 16 by the initiator portion 3 the defined time period is sufficient for the initiator portion 3 to trigger the actuator 16 of each of the plurality of the.