Pneumatic And Hydraulic Equipment Page 819

N O R G R E N Stroke Signal Valve Stroke Signal Valves emit a positive pneumatic signal to indicate the position of the piston at each end of the cylinder stroke. It can be used to energize other air or electrical mechanisms in a control circuit. This patented* design involves a three-way normally closed poppet valve that uses the same pressure that drives the cylinder piston to provide a pneumatic signal. Stroke Signal Valves are positioned on either or both ends of the cylinder according to your specifications. Each cylinder bore has minimum stroke limitations. The standard Signal Valve begins to give a pneumatic signal when the cylinder piston is within 1/8" of the end of the stroke. For signal distances less than 1/8", consult John Henry Foster Co. *Patent No. 3,648,568 Pneulectric Valve Pneulectric valves incorporate a single-pole, double-throw electric conversion switch with a Stroke Signal Valve. (Optional double-pole, double-throw switches are available.) The electric conversion switch screws directly into the outlet port of the Stroke Signal Valve, enabling the Pneulectric Valve to convert air pulses into electrical signals without the need of complicated electro-pneumatic circuitry. How to Order Stroke Signal Valves Add suffix SV ( ) after cylinder model number. Indicate in ( ) Stroke Signal Valve location: list head position first, cap position last. Valve position on head and/or cap should be indicated by position number 1, 2, 3 or 4. Example: J333A1-SV(02) - Bore x Stroke = Stroke Signal Valve mounted on cap end only, position 2. Example: A333A1-SV(02) - Bore x Stroke = Stroke Signal Valve mounted on cap end only, position 2. How to Order Pneulectric Valves Add suffix EV after cylinder model number. Example: J333A1-EV(42S)** - Bore x Stroke = Pneulectric Valve mounted on head end, position 4 and cap end, position 2, with single-pole - Double-throw. Add suffix EV after cylinder model number. Example: A333A1-EV(42S)** - Bore x Stroke = Pneulectric Valve mounted on head end, position 4 and cap end, position 2, with single-pole - Double-throw. ** S = Single-pole - Double-throw switch D = Double-pole - Double-throw switch NFPA AIR CYLINDERS How the Valve Works Start of the Stroke At the start of the stroke, the stroke signal valve is closed because areas (1) and (2) are equally pressurized (A), with area (1) being several times greater than area (2). Outlet port is vented to atmosphere. Mid-Stroke The same condition exists at mid-stroke with the exception that a greater pressure (B) has been applied to drive the piston. End of the Stroke At the end of the stroke the piston seal has passed the inboard air hole (3), supplying full pressure against area (2) When air has exhausted through (A) the valve stem shifts and pressure is supplied to the outlet port of the signal valve. 1/8" from bottoming. Pneumatic & Pneulectric Valves Shown Series A & EA, NFPA Aluminum Air Cylinders Series J & EJ, NFPA Steel Air Cylinders norgren pneumatics JHF Catalog [ Volume 7 ] (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j hf.com 819 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

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