|How is air pressure supplied to actuated valves?||Actuator ports are labeled A and B. Air is supplied to port A for both Normally Closed (AC) and Normally Open (AO) Spring Return actuators. Air is supplied to both ports A and B for Double Acting (AD) actuators. Air pilot controls must be used to supply or vent pressure to these ports.|
|What type of solenoid valves are supplied on pneumatically actuated valves.||Parker offers a choice of either NEMA 4 or NEMA 7/9 2-position (5/2) and 3-position (5/3) 4-way, directional control solenoid valves. Both NEMA models are NAMUR mount valves with a conversion plate to make them usable as either 4-way (5/2) valves for Double Acting actuators or 3 way (3/2) valves for Spring Return actuators.
Solenoid valves mounted on actuators have ports labeled 1, 3 and 5. Air is to be supplied to port 1 for both Normally Closed (AC) and Normally Open (AO) actuators. When the solenoid is energized, air is directed to port A of the actuator. When de-energized, air port 1 is closed and actuator air pressure in exhausted through port 3.
Air is supplied to port 1 for Double Acting (AD) actuators. When the solenoid is energized, air is directed to port B of the actuator and exhausts actuator port A to port 5, closing the valve. When the solenoid is de-energized, air is directed to port A of the actuator and exhausts actuator port B to port 3, opening the valve.
|What is NEMA?||NEMA, an acronym for National Electrical Manufacturers Association, was created in the fall of 1926 by the merger of the Electric Power Club and the Associated Manufacturers of Electrical Supplies. NEMA provides a forum for the standardization of electrical equipment, enabling consumers to select from a range of safe, effective, and compatible electrical products.|
|What brand of actuator do we use?||We use EL-O-MATIC actuators from Emerson.|
|Are the B series and Hi-Pro valve pneumatic actuators ATEX certified?||Yes but with all actuators from the US the European certificates must be requested at time of order|
|How long will an actuator last? How many cycles?||According to El-o-matic, they can be expected to last around 10years with maintenance. Life cycle conforms to EN15714-3|
|Which position does AO and AC assume when pressure is lost?||AO means Actuator Open, and can be interpreted as 'fail open' i.e. when pressure is lost, the valve is open. AC is the opposite|