🔴 Link to Download FREE E-book on Control Valves
👉 www.asad-shaikh.com/control-v...
Maximum Allowable Stem Torque (MAST):MAST refers to the maximum torque that can be applied to the stem (the shaft) of a valve without causing damage or compromising its functionality.
Factors Affecting MAST:The design and materials of the valve stem play a significant role in determining MAST.
Lubrication, temperature, and pressure conditions also influence the MAST value.
Safety Considerations:
Exceeding the MAST can lead to valve stem damage, malfunctions, or even valve failure.
Full Bore and Reduced Bore Valves:
Full Bore Valve:
A full bore valve has an internal diameter equal to the nominal pipe size.
It allows unobstructed flow and minimizes pressure drop.
Full bore valves are preferred in applications where maximum flow capacity is crucial.
Reduced Bore Valve:
A reduced bore valve has a smaller internal diameter compared to the nominal pipe size.
It may result in higher pressure drop but is more cost-effective.
Reduced bore valves are suitable for applications where lower flow rates are acceptable, and cost efficiency is a priority.
Isolating a Valve from a Line:
Valve Isolation:
To isolate a valve from a line means to completely stop the flow through that valve.
This is typically done for maintenance, repair, or to redirect flow in a piping system.
Valve isolation involves closing the valve to create a barrier, preventing fluid or gas from passing through.
Isolation Techniques:
For manual valves, isolation is often achieved by manually turning a valve handle to the closed position.
Automated valves can be isolated using control systems or actuation mechanisms to close the valve remotely.
Proper isolation procedures are essential to ensure safety and effective maintenance of the valve and the connected system.
ON-OFF Valves
Control Valve Basics
Instrumentation in Valves
Valve Operation
Valve Types
Control System Essentials
Valve Mechanism
Valve Components
Pneumatic Actuators
Hydraulic Actuators
Valve Positioners
Valve Actuation
Valve Selection Criteria
Valve Sizing
Valve Maintenance Tips
Valve Troubleshooting
Control Valve Applications
Control Valve Positioners
Control Valve Accessories
Valve Position Feedback