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Indpls, IN 46220
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STRAHMAN AIR OPERATED DRAIN VALVES

Strahman air cylinder operated drain valves are equipped with Double Acting air cylinders.

As drain valves are normally pasitioned below a vessel or tank in a vertical position, the opening or downward motion of the piston is usually very rapid. This is because air pressure, tank pressure and gravity combine to force the piston open (downward). This often causes excessive pounding on the opening stroke and if the cushion check valve which is a component of the air cylinder, does not control it, a speed control valve should be installed to regulate the downward motion. Speed control valves can be installed at either or both ends of the air cylinder and can be adjusted independently of each other. This permits the user to control both the opening and closing speeds. The upward or closing motion is normally much slower than the opening stroke as the piston is operating against gravity, the valve ring friction and often against tank pressure. For this reason, a minimum of 80 PSI air must be maintained. All air cylinder operated drain valves require support, to relieve the strain on the flange bolts or studs and to absorb part of the opening stroke shock. It should be designed so as to permit access to the air cylinder and valve for service or removal.

Air cylinders require lubrication and for best service, filtered air should be used. If plant air supply does not have this, a filter and lubricator sized for the cylinder should be installed.

For direct operation a 3 position air valve can be furnished. This permits for operation at or adjacent to the valve. This is a lever operated valve, the lever of which is moved in a short arc. At one limit, air is admitted to one end of the cylinder, at the other limit, air is admitted to the other end and discharged from the opposite end. A neutral position in the center of the arc will stop the valve in either direction.

Another option for control or indication is by means of special non explosion proof position indicator switches. These are factory installed, single pole, double throw switches, actuated by the air cylinder ram and which open or close a circuit at either end of the stroke. They are rated for 5 amp, 125 A.C.

For remote operation, a 4-way solenoid valve can be furnished, which is mounted on the air cylinder and which can be controlled by a push-button station or an electrically operated timing device.

Also all cylinders can be furnished with a double end rod, one end of which actuates the drain valve, the other end projecting from the opposite end of the cylinder, and which can be used to indicate visually the valve position or to mechanically operate trip switches for remote indication or control.

With all valves, explosion proof trip switches can be mounted on the bonnet which will open or close a circuit at either end of the stroke.

PARTS LIST