Pneumatic And Hydraulic Equipment Page 574

Models 34AR, 341AR Used primarily for conversion of maintained signal to a momentary actuation. Often referred to as "one-shot." Air pressure applied to pilot port generates force upon V-cup sealed piston which overcomes spring force and extends piston rod to actuate push-button valve. Small orifice in piston and two-piece piston and piston rod permits pressure to equalize and balance piston force. Spring then creates unbalance and returns piston and piston rod to original position resulting in only a momen- tary actuation of valve, even though air pressure remains applied to pilot port. This reset occurs within 0.3 seconds at 40 PSIG within 0.5 seconds at 100 PSIG and within 0.7 seconds when used with 4PP, 41PP, or 42PP valves. Maximum cycle life is obtained at 40-65 PSIG maximum. Any erratic action of the operators is often caused by small diameter or long pilot lines, restricted fittings, low flow pilot valves, slow building, or exhausting pilot signals, or excessive moisture or space between operator and valve body and can be eliminated by correcting these conditions. Models 34ASR, 341ASR Used to simplify pneumatic circuitry requiring "snap" and "reset" action by providing both functions in a single unit. Air pressure applied to pilot port builds upon V-cup sealed piston until pressure against piston area generates suf- ficient force to overcome ball detents. Actuation is delayed until pilot pressure reaches 35 PSIG 5 PSIG, and then the operator piston snaps forward to actuate push-button valve. At this point, small groove in cylinder wall permits pressure to equalize and balance piston force. Spring then creates unbalance and returns piston and piston rod to original position resulting in only a momentary actuation of valve, even though air pressure remains applied to pilot port. After snap action, the piston resets within approximately 0.3 seconds at 40 PSIG, within 0.5 seconds at 100 PSIG, and within 0.7 seconds when used with 4PP, 41PP, or 42PP valves. NOTE: The recommended maximum pilot pressure is 60 PSIG. If this pressure is exceeded, the operator will recycle snapping and resetting a second time. 341AR 341ASR TAC AIR PILOT OPERATORS Humphrey (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j hf.com JHF Catalog [ Volume 7 ] 574 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

Previous Page
Next Page