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US 5,971,007 AGranted
Piston valve
AssigneeSnap-Tite Technologies, Inc.
InventorsRobert Harcourt, Tom Dawson
Life of this patent
Estimating the term…
Abstract
A piston valve for use in connection with the fire protection industry is disclosed which includes features for protecting against corrosion. A sacrificial zinc anode is mounted in the body of the valve under the handwheel. A polymeric piston is used which cannot corrode. A grease fitting protects against corrosion at the interface of the spindle and the valve body or bushing within the body.
Claims5
A piston valve for controlling the flow of electrolytic fluid therein comprising;
- a body;
- a sleeve;
- a polymeric piston movable with respect to said sleeve;
- a spindle for moving said piston and opening and closing said valve;
- said spindle including a grease fitting for lubricating said spindle and said body of said valve;
- a sacrificial anode mounted to said body and extending inwardly therefrom into said valve body;
- and, said sacrificial anode combining chemically with said electrolytic fluid such that said anode is gradually dissolved in said electrolytic fluid at a rate dependent upon the properties of said electrolytic fluid thereby protecting said body, said sleeve, and said piston from corrosion.
4 more elements
A piston valve for controlling the flow of electrolytic fluid therein comprising:
- a body;
- a sleeve affixed to said body;
- a polymeric piston movable with respect to said sleeve;
- a spindle for moving said piston and opening and closing said valve;
- said spindle including a grease fitting for lubricating said spindle;
- and, a bushing for mounting said spindle with respect to said body;
- a sacrificial anode mounted to said body and extending inwardly therefrom into said valve body;
- and, sacrificial anode combining chemically with said electrolytic fluid such that said anode is gradually dissolved in said electrolytic fluid at a rate dependent upon the properties of said electrolytic fluid thereby protecting said body, said sleeve, and said piston from corrosion.
5 more elements
Dependencies are inferred from the claim text.