Rate of Rise Thermal Detectors Working Principle
A heat detector is a fire alarm device designed to respond when the convected thermal energy of a fire increases the temperature of a heat sensitive element. The thermal mass…
What is Fire Alarm System?
A fire alarm system has a number of devices working together to detect and warn people through visual and audio appliances when smoke, fire, carbon monoxide or other emergencies are…
Electric Motor Actuator Parts
The electric actuator uses an electric motor to provide torque to operate a valve. They are quiet, non-toxic and energy efficient. However, electricity must be available, which is not always…
Advantages and Disadvantages of Valve Actuators
A valve actuator is the mechanism for opening and closing a valve. Manually operated valves require someone in attendance to adjust them using a direct or geared mechanism attached to…
What is Manual Call Point (MCP) ?
Manual Call Point is a device for the manual initiation of an alarm. Manual fire alarm activation is typically achieved through the use of a pull station (term used in USA…
What are Linear Heat Detectors?
Linear Heat Detection (LHD) (also known as Linear Detection Wire or Linear Heat Detection Cable or Linear Heat) is a very commonly used method of fire detection. It can detect…
What is Gas Leak Detection System ?
This article refers to issues surrounding the detection of leaks and gases and what type of containment Gas Leak Detection System have been designed to manage unplanned releases. A gas…
What is Mixing or Diverting Valve ?
Another style of globe valve body is the three-way body, sometimes called a mixing or a diverting valve. This valve design has three ports on it, with the plug (in…
What is Cage-guided Globe Valve ?
A more modern version of the globe valve design uses a piston-shaped plug inside a surrounding cage with ports cast or machined into it. These cage-guided globe valves throttle flow…
What is Double-ported Globe Valve ?
Some globe valves use a pair of plugs (on the same stem) and a matching pair of seats to throttle fluid flow. These are called double-ported globe valves. Double-ported Globe…
