In-line water hammer arrester

摘要

An in-line water hammer arrester comprises a housing connectable at each end to a piping system, a fluid channel disposed within the housing to permit fluid to flow from the piping system through the housing and back into the piping system, a piston and a pressurized chamber. When a pressure spike occurs, the piston is pushed against the pressurized chamber allowing an expanded area for water flow until the pressure spike is dissipated and the piston returns to its resting position. When used with flexible hoses and tubing typically found with household appliance water supply lines, the in-line arrester is easily installed by a crimping or clamping type connector and takes up little space.

主权项

1. A pressure spike reducing apparatus comprising:
an outer housing comprising a first part and a second part, each part comprising an annular shoulder and a substantially cylindrical body extending from a radially exterior portion of the shoulder; a fluid channel at least partially disposed inside the outer housing, the fluid channel permitting the flow of fluid through the apparatus from an upstream end and out a downstream end; a substantially cylindrical piston disposed within the outer housing and configured to move within the outer housing between a substantially upstream position and a substantially downstream position in response to a pressure spike; a pressurized chamber within the outer housing and downstream of the piston, the pressurized chamber having an internal pressure that is only adjustable by movement of the piston; wherein the annular shoulder of the first part is disposed at an upstream end of the apparatus and the annular shoulder of the second part is disposed at a downstream end; and wherein the substantially cylindrical body of either the first part or the second part at least partially overlaps an end of the substantially cylindrical body of the other part; wherein the second part further comprises a shaft extending in an upstream direction relative to the shoulder, the shaft forming part of the fluid channel; wherein the piston is disposed around the shaft; wherein the piston comprises an inner body and a sealing body that is at least partially overmolded on the inner body and wherein the inner body is made of a material that is more rigid than the sealing body.