Types of Check Valves
CHECK VALVE (NON RETURN VALVE-NRV) Check valve is used to stop back flow in a piping system. This is also called Non return Valve (NRV) Check valves are available in
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Valve Position Indication
Operators require indication of the position of certain valves to permit knowledgeable operation of the plant. For such valves, remote valve position indication is provided in the form of position
Speed of Power Actuators
Plant safety considerations dictate valve speeds for certain safety-related valves. Where a system must be very quickly isolated or opened, very fast valve actuation is required. Where the opening of
Solenoid Actuated Valves
Solenoid actuated valves provide for automatic open-close valve positioning as illustrated in Figure 35. Most solenoid actuated valves also have a manual override that permits manual positioning of the valve
Self-Actuated Valves, Pneumatic & Hydraulic Actuators
Pneumatic actuators as illustrated in Figure 34 provide for automatic or semiautomatic valve operation. These actuators translate an air signal into valve stem motion by air pressure acting on a
Electric Motor Actuators
Electric motors permit manual, semi-automatic, and automatic operation of the valve. Motors are used mostly for open-close functions, although they are adaptable to positioning the valve to any point opening
Manual, Fixed, and Hammer Actuators
Valve actuators are selected based upon a number of factors including torque necessary to operate the valve and the need for automatic actuation. Types of actuators include manual handwheel, manual
Needle Valves
A needle valve, as shown in Figure 20, is used to make relatively fine adjustments in the amount of fluid flow. The distinguishing characteristic of a needle valve is the
Difference between Globe Valve and Gate Valve ?
Difference between Globe Valve and Gate Valve ? Both flow valves,Globe valve and gate valve have similar external housing but operational functions of both differ little. The main difference between
Pinch Valves
The relatively inexpensive pinch valve, illustrated in Figure 18, is the simplest in any valve design. It is simply an industrial version of the pinch cock used in the laboratory