Sheffer A SERIES - Manual (Page 2)

1 1
6
4 14
16
10
2
19
21
24 23 11
5 22
15
18
9
20
23
7
13
17
3
12 25
8
Small Cartridge Retainer
as Shown is Standard
Above 6 Inch Bore
Heads, Caps, Re-
tainers, Mountings
The heads, retainers, and mountings, are
machined from steel. The trunnion head,
flanges and foot bracket mounts are bolted.
Pivot and clevis mounts on 1
1 ⁄
8
" bore only,
also are bolted. Side lugs, centerline lugs,
and clevis (except 1
1 ⁄
8
" bore), are welded.
Trunions between heads, front head, and
rear head mounts are machined from solid
stock. All mounting holes are accurately
machined for socket head cap screws.
1, 2, 6, 43
Tie Rod Construction
For maximum strength tie rods are made of
high tensile steel rods and prestressed to
eliminate tube seal extrusion.
5 Cushions
Cushions are postive sealing. The cushion
pistons are hard chrome plated steel.
Cushion packings are Buna-N modified
U-Cup which gives positive sealing during
cushioning and free flow of air for rapid
acceleration. No check valve is needed.
Adjusting screw is O-Ring sealed with
prevailing torque type of locking action.
15, 16, 24, 25
Piston Rods
Piston Rods are high tensile steel, and hard
chrome plated. Rods with piston rod
diameters through 4" have a minimum
expected yield of 100,000 psi and are case
hardened to 50 Rockwell C. Rod diameters
of 4
1 ⁄
2
" and larger have an expected yield of
50,000 to 60,000 psi depending on diameter.
All rods are hard chrome plated for wear and
corrision resistance. Style 2 rod ends
through 2
1 ⁄
2
" rod diameter are high tensile
studs.
3
Cylinder Tubes
Tubes are high tensile aluminum alloy
tubing, hard anodized finish. The tube used
on 10" and larger bore sizes is honed steel
wth hard chrome plated I.D. The tubes are
mirror finished and sealed with static
O-rings placed to completely eliminate
extrusion. Fiberglass, brass and stainless
steel optional.
3
Rod Cartridges
Rod cartridges are long wearing and easily
maintained. They are made of bearing
bronze for long life and low friction. The
cartridge is easily removed for replacement
or maintenance of rod packing or rod wiper.
In most cases the cylinder does not need to
be dismounted, and rarely needs to be
disassembled. Groove provided for ease of
removal. Dual purpose O-Ring seals and
maintains tension to prevent longitudinal
cartridge motion.
7
Pistons
Pistons are made from fine grain alloy cast
iron in a one piece piston design secured
with self-locking nut. Piston faces are drilled
and grooved and relieved for fast air flow to
packings to eliminate blow-by and minimize
break away.
8
Piston Packings
Piston packings are made of standard
commercial Buna-N compound, in modified
U-Cup shape for low friction. They are self
adjusting and long wearing.
14
Rod Packings
Low friction, long life. Rod packings are also
made of standard commercial Buna-N
compound, with modified U-Cup design
that offers minimum friction and long life. It
is self-adjusting to wear and pressure.
17
Rod Wipers
Rod wipers are efficient, and long wearing.
They are furnished in commercial
polyurethane compound as they are
designed to wipe piston rod clean and dry in
both directions, prevent foreign matter from
entering cylinder and insure long life for
piston rod, rod bearing and packing under
all normal conditions.
18
Ports
The ports are amply sized for most
applications.
Construction
Dimensionally interchangeable to meet ansi specs
machineD steel heaD anD cap