Use individual clamping valves to clamp several workpieces independently with a single power source. 3-way clamping valves are used to control single-acting clamps. These high-quality valves have a zero-leakage poppet design, with a built-in check valve. Extremely compact. Available either with a mounting base (for installation with standard 1/4" BSPP fittings and exposed fluid lines) or without a base (for manifold mounting using the O-ring ports underneath the valve).