1. Fire damper, fire control valve, normally open, closed at 70 degrees, usually installed in the duct through the firewall, the fire off, you can set the output signal, smoke over 70 degrees when the valve is closed, the chain to send (fill ) Fan off; 2. Smoke and fire control valve, normally open, 70 degrees off, the same, but more than one electrical signal input, remote control by the control room can be closed, usually used for air supply, fire wind common wind duct system , The fire can be controlled off the room does not need to fill the wind; 3. Fire damper, 280 degrees fuse off, normally open, the output signal, and 1 similar, but the fusing temperature is different, generally used in fire exhaust pipe through the firewall Department, the flue gas temperature exceeds 280 degrees automatically fuse off, the chain can be closed exhaust fan. Exhaust valve: 1. Exhaust fire damper (normally closed, open the electrical signal, 280 degrees blown off, or manually shut down) is generally used in the exhaust system can be installed in the exhaust fan suction inlet, the fire by the control room Control open, close the exhaust fan can also be closed chain. 2. Exhaust valve, with the above 3, each unit called different, some according to its action temperature is called exhaust valve, and some according to its nature of the use of fire valve is called, but only for the equipment side of the general fire valve fuse Metal to 280 degrees fuse that 3. Automatic smoke fire damper (subway project) subway ventilation, air-conditioning system fire, smoke exhaust valve with automatic fire alarm and gas fire extinguishing system linkage control functions. Each fully automatic fire damper has two independent electric control signals, respectively, by the EMCS, gas consumption monitoring system, control signals are DC24V ± 10% signal. Each automatic smoke damper has six independent feedback signal (three open in place, three off in place) feedback signals are normally open passive contact signal. Exhaust port: If you install the necessary exhaust valve in the pipeline, you can use the ordinary single-layer louver tuyere; otherwise need to use plate exhaust port, it also has a smoke damper mechanism.
System Description
The petrolatum coating system is designed for corrosion protection of buried or exposed or marine pipes rods, cables, valves and metal fittings, tanks. it consist of petrolatum tape, petrolatum mastic, petrolatum primer, outer tape.
Petrolatum Tape
Petrolatum tape is a non-hardening and non-cracking corrosion protection wrap . It is highly resistant to mineral acids, alkalis, salts and micro-organisms and highly impermeable to water vapor and gases. Used for the protection of buried or exposed pipes, rods, cable, valves and metal fittings from corrosion.
It is composed of a non woven fibre fabric coated with a neutral compound based on saturated petrolatum and inert siliceous fillers.
Perol Tape
petrol tape, petrolatum tape
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