Patent ID: 7829806
Filing Date: 2010-11-09
Classification: H01H

Abstract:
1. A flowswitch for installing in piping, comprising: a flowswitch base having an inner cavity; a pivot rod being arranged for rotating in the flowswitch base, the pivot rod configured with a first pair of machined or formed O-ring grooves separated by a first machined or formed flange, and also configured with a second pair of machined or formed O-ring grooves separated by a second machined or formed flange; a paddle arm being coupled to the pivot rod inside the inner cavity, configured for moving in response to fluid flowing in the piping and rotating the pivot rod; an actuating arm being attached to the pivot rod and configured for actuating a switch when the pivot rod rotates; and a first pair of lubricating O-rings being respectively arranged in the first pair of machined or formed O-ring grooves and separated by the first machined or formed flange, and a second pair of lubricating O-rings being respectively arranged in the first pair of machined or formed O-ring grooves and separated by the first machined or formed flange, each of the first O-ring grooves and the first machined or formed flange acting to hold each of the first pair of lubricating O-rings in place on the pivot rod in response to pressurized fluid flowing in the piping, each of the second O-ring grooves and the second machined or formed flange also acting to hold each of the second pair of lubricating O-rings in place on the pivot rod in response to pressurized fluid flowing in the piping, so that the first pair of lubricating O-rings and the second pair of lubricating O-rings provide a respective seal between fluid being sensed and the outside environment and acting as a bearing on which the pivot rod rotates when the paddle arm moves.