Pneumatic And Hydraulic Equipment Page 1104

TANDEM CYLINDERS AND MULTI-STAGE CYLINDERS The tandem cylinder (Figure A) has two pistons connected to a common rod, resulting in twice the force output of a single cylinder. Multi-stage cylinders (Figure B) offer multiple, positive strokes by pressurizing one cylinder, the other, or both. Contact the factory for other variations. ROD GLAND DRAIN BACK When not even a drop of external leakage can be tolerated, the rod gland drain back provides a signal that the rod seal set has worn to the point of replacement - without the danger of contamination from leakage. EXTERNAL ROD SEAL When a cylinder is to be operated under water, provision is made to prevent the water from being drawn into the cylinder at the time of valve shift or pressure differential. STAINLESS STEEL PISTON RODS Many applications, especially those subjected to water spray, require the use of stainless steel piston rods. We stock AISI Type 304 hard chrome plated, stainless steel and will furnish that type unless otherwise specified. Type 304 is considered a good, corrosion resistant type of stainless steel, but the minimum expected yield is approximately 35,000 psi and that factor must be considered with respect to operating pressure, column loading, etc. FIGURE B FIGURE A ADJUSTABLE STROKE Shown is an integral stroke adjustment (externally adjusted) that is accomplished by the use of a bump rod threaded into the cylinder cap. Seals are incorporated to prevent external leakage and a lock nut is included. ROD BOOT Sheffer cylinders are provided with a rod wiper to remove contam- ination from the rod. Rods that are exposed to contaminants that cling to the rod, such as tar, should be covered with a rod boot. SPHERICAL BEARINGS Pivot mounting brackets and rod eyes can be provided with spherical bearings to compensate for misalignment on both ends of cylinders. Consider also the use of the Sheffer Uni-Lign described in separate Accessories Section of this bulletin. NON-ROTATING PISTON ROD Two methods of providing non-rotating piston rods are employed. The internal rod type (Figure A.) is generally used since it requires less space and is neater. The type shown in Figure B. must be used on small bore cylinders where internal space is limited. FIGURE A FIGURE B The Sheffer Corporation manufactures many cylinders with variations to meet special customer needs. In addition to those illustrated below, some of the more popular variations are: CYLINDERS WITH BOOTS COMBINATION MOUNT CYLINDERS CYLINDERS WITH BUILT-IN LIMIT SWITCH ACTUATORS LOCKING CYLINDERS PRECISION STROKE CYLINDERS PRECISION MOUNT CYLINDERS ENGINEERING-SPECIAL VARIATIONS Sheffer cylinders (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j JHF Catalog [ Volume 7 ] 1104 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

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