Abstract: Methods for manufacturing a water hammer arrester having an endurance against pressure of a fluid as well as excellent productivity. There is provided Methods for manufacturing a water hammer arrester comprising steps of: deforming plastically an end of a work piece for a housing to close it by pressing the end toward a center thereof while the work piece is rotated at high speed, the work piece is a brass pipe having predetermined length; forming a housing by cutting a closed part in prescribed thickness; filling up a gas and inserting a piston within the housing to prevent the gas from leaking; forming a connecting part having smaller diameter than the housing by pressing an outside of an open end of the housing provided with poured gas and the piston; and mounting a connector to the connecting part.

Abstract: A water hammer arrester constructed with a cylindrical housing having a closed upper end and an internal pressure chamber. A piston slidably installed within the housing to receive a reaction force medium such as gaseous nitrogen, provides a space that communicates with an integral pressure chamber within the closed upper end of the housing. A threaded connector bearing a nipple circumscribed with a plurality of circumferential grooves is crimped into the neck of the lower end of the housing.