Valves are an essential part of any piping system that conveys liquids, gases, vapors, slurries and mixtures of liquid and gaseous phases of various flow media. Some valves are self-actuated while others are manually operated or have actuators that are powered with electric motors, are pneumatic or hydraulic, or a combination to operate the valve. Valves are manufactured with metals and non-metals.http://www.lozosevalve.com/str....aight-stroke-control
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