Parker - Schrader Bellows
- Pneumatic and Hydraulic Industrial Cylinder Products
- Series PH Heavy Duty Hydraulic Cylinders
- Series CHE/CHD Compact Hydraulic Cylinders
- Series RDH Heavy Duty Roundline Hydraulic Cylinders
- Series HMI Metric Hydraulic Cylinders
- Series SA Stainless Steel Air Cylinders
- Series VE Air Cylinders for Valve Actuation
- Position Indicating Switches
- Cylinder Mounting Accessories
- Hydraulic and Pneumatic Cylinder Products Overview
Schrader Bellows is a long-established American cylinder brand, now manufactured by Parker's Hydraulic Actuator Division and one of the reference designs for NFPA tie-rod pneumatic and hydraulic cylinders in North American industry. The range covers heavy-duty and medium-duty hydraulic cylinders, heavy-duty pneumatic cylinders, compact hydraulic cylinders, roundline welded cylinders, metric cylinders, stainless steel air cylinders and valve-actuator cylinders, together with position indicating switches, mounting accessories and seal kits, so selection, installation and maintenance are all covered by catalog.
Etron supplies Schrader Bellows pneumatic and hydraulic cylinders with selection by NFPA mounting code, bore and stroke, quotations and lead-time checks. Legacy model codes (NC9, SHM, PH-2/PH-3 and others) can be converted to current part numbers with the factory cross-reference.
Product Lines
Series PH Heavy-Duty Hydraulic Cylinders
NFPA tie-rod heavy-duty hydraulic cylinders, the workhorse for industrial machinery; many mounting styles, adjustable cushions and optional position switches.
Series PL-2 Medium-Duty Hydraulic Cylinders
Tie-rod cylinders for medium-pressure hydraulics, sharing mounting dimensions with PA-2; an economical choice for low-pressure hydraulic systems.
Series PA-2 Heavy-Duty Pneumatic Cylinders
NFPA tie-rod heavy-duty air cylinders, 1" to 14" bore at 250 psi, double-acting with adjustable floating cushions and optional magnetic piston and rod lock; common in factory automation and packaging.
Series CHE/CHD Compact Hydraulic Cylinders
Short-stroke, low-profile hydraulic cylinders for fixtures, presses and tooling; CHE is the aluminium standard type (140 bar), CHD the steel high-pressure type (207 bar), both with optional magnetic piston and position switches.
Series RDH Roundline Hydraulic Cylinders
Welded round-body design without tie rods, resisting shock and side loads; for construction materials, metal forming and heavy equipment.
Series HMI Metric Hydraulic Cylinders
Tie-rod hydraulic cylinders to ISO 6020-2 metric mounting dimensions, interchangeable with European-standard equipment.
Hybrid Actuation System (HAS)
A self-contained unit combining a hydraulic cylinder with an integrated electric pump and reservoir: no external power unit, just electrical control.
Series VE Valve-Actuator Air Cylinders
Air cylinders designed for actuating gate and knife-gate valves and similar pipeline valves, 2" to 24" bore, single acting with spring return or double acting.
Series SA Stainless Steel Air Cylinders
Stainless steel body and piston rod for food, pharmaceutical and chemical environments that need corrosion resistance and wash-down.
A4, A5 and A6 Series Air Control Valves
Alongside cylinders, Schrader Bellows supplies the A4, A5 and A6 series of 4-way, 5-port air control valves: single and double solenoid pilots, single and double remote air pilots, three mounting styles (direct pipe ported, subbase and manifold), plus sandwich regulators and the Add-A-Fold manifold system, the standard companions to NFPA cylinders.
A4, A5 and A6 Series Overview
4-way, 5-port, 2- and 3-position air control valves in three basic sizes, 3/8", 1/2" and 1", with port sizes from 3/8" to 1-1/4".
Single Solenoid Valve (Direct Pipe Ported)
Single solenoid pilot with spring return; the direct pipe ported style is the economical choice, with optional indicator light and manual or locking override.
Double Solenoid Valve (Direct Pipe Ported)
Double solenoid pilots with memory: the valve holds its last position when de-energized.
Remote Air Pilot Valve
Single or double remote air pilot versions shifted by an external air signal, for installations without power or in hazardous areas.
Single Solenoid Valve, Subbase Mounted
Plug-in subbase mounting: the valve is replaced without disturbing the piping.
Double Solenoid Valve, Subbase Mounted
Subbase-mounted double solenoid version; pipe once, swap the valve body any time.
Three-Position Valves
Three center conditions: all ports blocked, cylinder ports to exhaust, cylinder ports to inlet; for mid-stroke stopping and safe venting.
Sandwich Regulator
Plug-in sandwich regulator for the A4 (3/8") size: single-port, common-port or independent A/B regulation.
Add-A-Fold Manifold System
Plug-in manifold sharing supply and exhaust across several valves, simplifying plumbing and allowing stations to be added or removed.
Add-A-Fold Manifold Base Kit
Manifold base and end-plate kits assembled on site into any number of stations.
Special Service Pilot (Gold Cap)
Solenoid pilot for continuous energization, fail-safe safety circuits and higher ambient temperatures (38 °C).
NEMA 4 Pilot
Watertight, wash-down NEMA 4 solenoid pilot; UL/CSA listed hazardous-location versions are also available.
4-way, 5-port, 2- and 3-position; basic sizes 3/8", 1/2" and 1", port sizes 3/8" to 1-1/4"; Cv: A4 3.8 to 5.5, A5 4.8 to 5.9, A6 10.8 to 13.3
Operating pressure 35 to 140 PSIG (2.4 to 9.6 bar), ambient -18 to 24 °C; standard pilots rated for continuous duty, special service pilots to 38 °C ambient
Three mounting styles: direct pipe ported, plug-in subbase and plug-in manifold; solenoid pilots interchange between all sizes of similarly mounted valves
Options: indicator lights (120 VAC), locking and non-locking overrides, 1/2" conduit connection, JIC junction box, hazardous-duty (UL/CSA) and NEMA 4 pilots; field-convertible external pilot for vacuum and other service
A4 and A6 (3/8", 1") dual O-ring design: suitable for non-lube operation, hardened coated aluminium spool, extended-life approval, identified by gold end caps; CSA approval for general purpose use on all valves
Series at a Glance
Series PA-2 heavy-duty pneumatic: 1" to 14" bore (25 to 356 mm), 250 psi (17 bar), built to ANSI/NFPA T3.6.7 heavy-duty, 14 NFPA mounting styles, adjustable floating cushions, optional Rod Lock
Series PH heavy-duty hydraulic: 1.5" to 8" bore (large-bore version to 20"), 3000 psi (207 bar), ANSI/NFPA T3.6.7, 19 mounting styles; seal classes 1 to 8: standard -23 to 74 °C, low-temperature to -46 °C, filled PTFE to 204 °C
Series PL-2 medium-duty hydraulic: 1" to 8" bore, 1000 psi nominal (69 bar), ANSI/NFPA T3.6.7 medium-duty, same mounting dimensions as PA-2
Series CHE/CHD compact hydraulic: CHE aluminium 20 to 100 mm bore, 140 bar, strokes to 150 mm; CHD steel 20 to 80 mm, 207 bar, strokes to 100 mm; referenced to ISO 16656, magnetic piston with position switches
Series RDH roundline welded hydraulic: 1.5" to 8" bore, 3000 psi (207 bar), 9 mounting styles, about 36% lighter than a comparable tie-rod cylinder; Series HMI metric hydraulic: 25 to 200 mm bore, 210 bar, ISO 6020/2 interchangeable mountings, 12 styles, -20 to 150 °C depending on seal group
Series SA stainless steel air: 1-1/8" to 8" bore, 250 psig, 303/304 stainless, -40 to 93 °C (FKM to 204 °C); Series VE valve-actuator air: 2" to 24" bore, 150 psi, single or double acting with spring return; position switches: ALS solid-state (10 to 30 VDC, IP67, sensing the magnetic piston through a standard steel tube), reed, EPS inductive and CLS magnetically actuated contact types, with ATEX, UL and CSA versions
Applications
Pulp and paper: heavy-duty hydraulic cylinders on calenders, cutters and winders
Construction materials and metal forming: PH and RDH heavy-duty cylinders on presses, bending and extrusion machines
Factory automation and packaging: PA-2 air cylinders, CHE compact cylinders and position switches for positioning and clamping
Valve actuation: Series VE cylinders operating butterfly and ball valves in pipelines
Food, pharmaceutical and chemical: Series SA stainless steel cylinders for wash-down and corrosive environments
Catalog Downloads
Selection and Inquiry
To select a cylinder, please tell us the medium (air or hydraulic oil), bore and stroke, working pressure, mounting style (NFPA mounting code or a photo), rod-end style and rod diameter, whether cushions, magnetic piston and position switches are required, seal material and operating temperature, and cycle rate. For a replacement, attach the nameplate model code or a photo and we will convert it to the current part number with the factory cross-reference.
For a quotation or lead time, send us your requirements on the inquiry page