VALVES in a complete range of G 1/8", G 1/4 and G 1/2", both in line and on base Metal Work offers a full range of valves and solenoid valves to meet all the possible requirements regarding compressed air supply, cut-off and regulation. The range of conventional valves with in-line couplings is available in four different types of actuation: mechanical, manual, pneumatic and electro-pneumatic. Standard valves come with either pneumatic or electro-pneumatic actuation.