FOR MODELS: JGW, JGR AND JGJ SECTION 5 - MAINTENANCE
PAGE 5 - 28 1/01
Type "BTR" Single Acting Seal Set
This set is made up of three rings. It seals in one direction only. The first ring (pressure side)
is radially cut with an installed total end gap of 0.078 to 0.109 inches (1.98 to 2.77 mm) for
Teflon material and 0.156 to 0.187 inches (3.96 to 4.75 mm) for bronze, Polyimide and
PEEK materials. The second ring is a tangentially step cut ring and is also made of Teflon.
The first two rings are doweled so the cuts are staggered from one ring to the other. The
third ring is called a back-up ring and is radially cut. The bore in this ring is larger than the
rod diameter. This allows the radial joints to be tight together forming a gas seal. No dowel is
necessary for this ring. See Figure 5-15:
FIGURE 5-15: TYPE “BTR” SINGLE ACTING SEAL SET
Radial Cut
Alignment
Dowel
Radial Cut
Pressure Side Ring
Material: Teflon
Middle Ring
Material: Teflon
Back-Up Ring
Material: Cast Iron
Letters toward pressure/cylinder
BT R
BTR
Tangential
Step Cut
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