Valve Position Indicators are electrical switching devices that mount directly on a valve actuator or indirectly on a transfer case. They are used with both rotary actuated valves and linear actuated valves. It provides two basic switching options such as non-contact and mechanical. Valve position indicators differ in terms of the number of indicated positions, the number of switches and pole & throw specifications. Valve position indicators mount on either standard shafts or specialty shafts.
Valve Position Monitor provides visual and electrical signals of valve position. Valve position moniters are compatible with rotary potentiometer (resistance) inputs and they provide a 4-20 mA output proportional to the overall measurement. Each unit provides power for the associated transducer, processes the signal and outputs a 4-20 mA dc current that is proportional to a user specified range such as 0-100%. These valve position monitors are designed specifically for linear valve applications. They use a unique shaftless design to mount snuggly under the bonnet of control valves and are suitable for all hazardous areas.
Valve position transmitter is comprised of an indicator assembly having a base with an aperture located thereon and an adjusting ring placed on the base about the aperture. Valve Position Transmitter is comprised of a switch box assembly. This transmitter is available with an external encoder for external mounting.
Valve Seals are used to minimize process fluid leakage along the stem that connects the internal parts with the external actuator. These seals leak to minimize product release and maintain valve seals in good condition. The valve seals are usually made of neoprene. Valve seals are used to limit the amount of oil that is used to lubricate the valve stem and valve guide. Valve seals keep oil from draining down through the space between the valve stem and the valve guide. Valve seals for the intake and exhaust valves are commonly of different designs & materials. These valve seals are replaced without removing the cylinder head. There are three basic designs of valve seals such as positive lock, umbrella type and simple o-ring seals.