NFPA Interchangeable Cylinders
The Series B is a high quality cylinder for heavy duty air service, or medium pressure hydraulic service up to 1,500 psi depending on bore size.

Piston Rod
High strength chrome plated alloy steel and is ground and polished to a 6 to 10 micro-inch finish.

Tubing
Seal life is highly dependent on the finish on which the seal slides. Steel tubing is hard chrome plated and honed to a 10 to 15 micro-inch finish to provide a proper sealing surface, resist corrosion, and provide a wearing surface which resists scoring.

Seals
Block-vee self adjusting dynamic seals (Buna N). Back-up rings prevent extrusion at higher hydraulic pressures. Optional Viton seals are available for unusual temperature and fluid applications.

The static O-ring tubing seals with pressure and are backed up by tubing and head metal-to-metal end contact for leak free operation.

Piston
Motion Controls unique piston design prolongs service life and reduces maintenance. The piston itself is only a carrier for the piston seals and the actual bearing, which is a Teflon wear strip.

Rod Bearing
The complete bronze rod bearing cartridge can be removed and replaced without removing the cylinder tie rods. The cartridge threads into the cylinder bearing plate, but pilots into a machined bore in the cylinder head for accurate alignment.

Cushions
The Motion Controls floating "memorizing" cushion design (US patent # 3,247,767) solves traditional cushioning problems by enabling the cushion plunger to adjust to the eccentricity of the cushion plunger bore - and remembering the adjustment on succeeding cycles.

It accomplishes this by axially loading the floating plunger so that when it shifts in response to the location of the cushion bore, it stays shifted under pressure of the loading.

B Series Pressure Ratings and Power Factors

Pressure ratings of the B Series Cylinder vary with the bore size. Explicit definition of "Non-shock", "Heavy duty", and "4:1" pressure ratings is difficult, since the terms are general. The most severe applications, however, would fall under the 4:1 rating, since it offers maximum protection against shock loading, which may reach 4 times line pressure. The difference between "non shock" and Heavy duty" is often marginal, and system velocity, quick valve shifting, cylinder acceleration and deceleration, etc., should be considered.