Different air controls are used for different types of applications:
Chargeable Models have a charging valve that allows for a predetermined pressure charge to be applied and held in the dampener. No permanent source of compressed gas is required to be attached to the dampener. Chargeable models are used primarily with metering, piston and peristaltic pumps for pulsation dampening. Chargeable models are also used for surge suppression to prevent water hammer from quick closing valves, for make-up fluid to prevent pump cycling, and for suppression of pump startup or shutdown pressure spikes.
Adjustable Models use a self-relieving regulator to set dampener pressure. A compressed air line must be permanently attached to the regulator. The regulator allows for an easy, convenient method for readjusting the dampener if the system fluid pressure changes. Adjustable models are designed for use on air operated diaphragm pumps.
Automatic Models have an automatic poppet type valve located in the non-wetted section of the dampener which allows for an increase in compressed air pressure to balance an increase in system liquid pressure. As liquid system pressure increases, the bladder is pushed further up into the dampener until it touches the internal automatic valve. This contact opens the valve and allows an increase of compressed air to enter the dampener. When the air pressure equals the system liquid pressure, the dampener is in balance and pulsations are minimized. If a change in pressure occurs this process is repeated. Automatic models are designed for use on air operated diaphragm pumps in systems with a varying discharge pressure. A compressed air line must be permanently attached to the dampener.
Inlet Stabilizer (J Model) air controls consist of a compound pressure gauge, a pressure/vacuum tight ball valve and a Venturi valve. When compressed air is passed through the Venturi valve at high speed, a low pressure area is crea