to provide a good seal such as rubber or plastic face seal 33 includes four outlet channels two of which 14 and 14 39 are shown in fig1 and 4 the valve may be connected to another device by screwing in the threaded end of inlet valve 13 into an appropriately threaded receptacle on that device until face seal 33 lies flush against a matching surface on the device that matching surface having outlet and inlet ports accommodating the outlet and inlet ports of the valve fig2 shows the linearly actuated valve illustrated in fig1 in its second or open position in the second position valve seal surface 16 does not engage inlet port 13 and thereby opens the connection between inlet port 13 and outlet ports 14 and 14 39 movement between the first or closed position and the second or open position is achieved by applying sufficient electrical current to electrical terminals 21 and 22 by for example through the circuit shown in fig3 when shape memory alloy means 18 is subjected to such current it decreases in length to longitudinally move valve seal holder 17 toward stop 19 against the compression force of bias means 20 from stop 19 toward valve seal holder 17 valve seal 15 will move longitudinally from its first position to its second position in which valve surface 16 no longer engages inlet port 13 decreasing or eliminating such a current combined with the force of bias means 20 causes shape memory alloy means 18 to increase in length toward the position shown in fig1 varying the current supplied to shape memory alloy means 18 varies the amount the valve opens fig3 shows a variable frequency electrical pulse circuit that may be used in conjunction with the linearly actuated valve electrical.