  Red
Valve Pinch Valve sleeves are constructed similar
to a heavy-duty truck tire. This cutaway of a Red
Valve hand crafted quality Pinch Valve sleeve illustrates
the design: an elastomer inner tube, the only part
of the valve in contact with the process; high strength
nylon, polyester, or Kevlar fabric; and an exterior
Neoprene cover. These parts are vulcanized under
pressure to form a pressure-containing sleeve that
is the heart of a Pinch Valve. Pinch Valve sleeves
are offered in the following elastomers: |
|
|
| Elastomer |
Temperature |
| |
Pure
Gum Rubber
This
is Red Valve's standard sleeve material for Pinch
Valves. It has excellent resiliency, tensile strength,
and abrasion resistance. Pure Gum Rubber is generally
good for most weak chemicals, wet or dry organic
acids, alcohols, and ketones.< |
-500F
to +1 800 F
continuous service. |
| |
|
Neoprene
This
elastomer is generally resistant to moderate chemicals,
ozone, fats, and many hydrocarbons.
Also
available in: White food grade Neoprene
|
-500F
to
+2300F
continuous service. |
| |
Buna-N
Buna-N
is resistant to many hydrocarbons, fats, oils, grease,
kerosene, and moderate chemicals.
Also
available in: White food grade Buna-N
|
-300F
to
+2300F
continuous service. |
| |
Hypalon®
Resistant
to heat, ozone, weathering, and oxidizing chemicals.
It has good resistance to strong acids at room temperatures.
|
-500F
to +2300F
continuous service. |
| |
|
Chlorobutyl
Generally
resistant to animal and vegetable fats, oils,
greases ozone, heat, and strong oxidizing chemicals.
Chlorobutyl has the lowest permeability of all
the synthetic rubbers.
Also available in: White food grade Chlorobutyl
|
-500F
to +2500F
continuous service
+3000F
intermittent service |
| |
Polyurethane
Polyurethane
has excellent abrasion resistance and low
temperature flexibility, tear resistance, ozone
and weathering resistance. Polyurethane has outstanding
oil and fuel resistance, and is generally resistant
to moderate chemicals, fats, diluted acids, and
many hydrocarbons. |
-500F
to +3000F
continuous service. |
| |
EPDM
Also
known as Nordel, EPDM is recommended for good abrasion
resistance at elevated temperatures. Good for steam,
water, ketones, and diluted acids.
Also
available in: White food grade EPDM
|
-500F
to +3000F
continuous service
+3250F
surge temperatures |
| |
Viton®
Viton
exhibits good resistance to most oils, chemicals,
solvents, and halogenated hydrocarbons, and an excellent
resistance to ozone, oxygen, and weathering.
Also
available in: White food grade Viton.
|
-100F
to +4000F
continuous service. |
|
Viton®
and Hypalon® are registered trademarks of DuPont
Dow Elastomers.
|
