Pneumatic And Hydraulic Equipment Page 575

TAC AIR PILOT OPERATORS These air pilot operators are for use with TAC push-button valves and the Model ESB Electric Switch Bracket to convert them to air pilot operation. The operators feature snap action for time-delay circuits, automatic "one-shot" reset, or a combination of snap action and automatic reset. 34A 341A Air Pilot Operators Models 34A and 341A air pilot operators thread directly onto the collars of push-button valves and the Model ESB Electric Switch Bracket. The 341A air pilot operator provides approximately twice the actuation force of the 34A at the same pilot pressure and is used for lower pilot pressure requirements or to amplify weak pilot signals, especially to 41PP and 42PP valves with positive detents. Part No. Port Size Price 34A 10-32 $8.11 341A 1/8" $9.47 34AS 341AS Air Pilot Operators with Snap Action Models 34AS and 341AS air pilot operators thread directly onto the collars of push-button valves and the Model ESB Electric Switch Bracket. They are used primarily for time-delay circuits and other slow- building pilot pressure applications. The actuation of the operator is delayed until pilot pressure reaches 35 psig 5 psig. At this pressure, the operator piston snaps forward to actuate valve or switch and remains shifted until pilot pressure is exhausted. Maximum cycle life is obtained at 40-65 psig, 125 psig maximum. Note: When using 341AS-65, the actuation of the operator is delayed until pilot pressure reaches 65 psig, 5 psig. Part No. Port Size Price 34AS 10-32 $24.91 341AS 1/8" $25.41 341AS-65 1/8" $36.13 34AR 10-32 $24.23 341AR 1/8" $25.41 34ASR 10-32 $28.69 341ASR 1/8" $28.95 34ASR 341ASR Air Pilot Operators with Snap Action and Reset Models 34ASR and 341ASR air pilot operators provide both snap action and reset features in a single unit and thread directly onto the collars of push-button valves and the Model ESB Electric Switch Bracket. Actuation is delayed until pilot pressure reaches 35 psig 5 psig, and then the operator piston snaps forward to actuate pushbutton valve or electric switch. At that point the piston becomes pressure balanced and the spring resets the operator while removing actuator force from the valve. After snap action, the piston resets within approximately 0.3 seconds at 40 psig, within 0.5 seconds at 100 psig. NOTE: The recommended maximum pilot pressure is 60 psig. If this pressure is exceeded, the operator will recycle - snapping and resetting a second time. 34AR 341AR Air Pilot Operators with Reset Models 34AR and 341AR air pilot operators thread directly onto the collars of push-button valves and the Model ESB Electric Switch Bracket. When used on a spring-return valve, they provide a momentary "one-shot" output signal (40 psig/min.), which actuates the operator piston immediately. The operator's pressure-balanced piston then resets, even in the presence of a pilot signal. This reset occurs within 0.3 seconds at 40 psig, within 0.5 at 100 psig. Maximum cycle life is obtained at 40-65 psig, 125 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. H U M P H R E Y Humphrey JHF Catalog [ Volume 7 ] (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j hf.com 575 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

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