Abstract: A silencer assembly primarily for the passage therethrough of exhaust gases from an adsorption dryer tower comprises a silencer element to one end of which pressurized gas is directed from an outlet, a control valve downstream of the silencer element, and means for restricting the flow of pressurized gas from the outlet to atmosphere through the silencer element, the arrangement being such that, when the pressure of the gas from the outlet exceeds a predetermined value, the control valve is closed and gas flows from the outlet into and through the silencer element to atmosphere, and, when the pressure of gas from the outlet falls to said predetermined value, the control valve opens and the gas flows from the outlet through the control valve to atmosphere, by-passing the silencer element.

Abstract: An adsorption dryer includes first and second drying towers. Each tower has a first port and a second port through which gas can pass into or out of the tower. A first and a second manifold are connected respectively to the first and the second ports of both towers. The manifolds each include integral gas passages, each port of the towers being in communication with a gas passage. Each of the manifolds includes at least one integral valve seat upon which a valve actuator is mounted to constitute a valve to control flow of gas through the gas passages.