Various Molded Gland Packing

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VALQUA No.
7740-APT (BR：NBR)
Product name
Slipper seal
Shape
APT
APT
Features1
Seal for reciprocating motion, low resistance
Features2
Stick-slip is hard to occur.
Features3
Better reliability, prevents extrusion
Inventory status
Manufacturable product

Standard size
　
Type
Squeeze

Application classification
For pistons
Pressure classification
Oil hydraulic (High pressure)
Standard material
Usage location Material name Material No.
BR NBR B0380
Sliding ring 3M0, 3U8
BUR PA

Non-standard quality of material (adaptable material)

Sealing direction
Flat surface Cylinder Cylindrical piston Cylindrical rod
- - ○ ×
Size
Standard: φ50 to 320

■ Product content and main applications

Product content
VALFLON seal ring combined with various synthetic rubber back rings. Coefficient of friction is extremely low because of fluororesin used as a slider.
Main applications
It is used as a compact seal with excellent sealing performance for pistons under a wide range of pressures and temperatures.

■ Service temperature range

Rubber material Service temperature range
NBR -30℃ ～ 80℃
Click here for the list of rubber materials

■ Operating pressure, pressure direction and pressure types

Pressure Pressure (with back-up ring) Pressure direction
34.3MPa With BUR is the standard type. Bi-directional
-

Pressure types
shock, surge, pulse, vacuum		 They can all be accommodated.

■ Motions and strokes applied

For fixing -
Reciprocating ○
Rotating ×
Helical ×
Opening and shutting ×
Sliding ×
Oscillating -
Stroking
Stroking is not specified; however, a short stroke is acceptable.

■ Fluid, speed and PV value

Liquid ○
Gas △
Fine particle -
General dust -
Oil film -
Speed
0.01～1m/s
PV Value
-

■ Lubrication, mountability, sliding resistance, compression resistance, eccentricity/inclination, conformance

Lubrication
Needed※1
Mountability
Fair
Sliding resistance
and compression resistance
Low
Eccentricity/inclination
and conformance
Average

*1 Usable even in poor lubrication condition (However, PTFE for non-lubrication must be used.)

■ Cross-section dimensions and design precautions

・Cross-section dimensions

5Ｗ


(7W is the standard)

・Design precautions

Acceptable as long as it is designed based on the design criteria
If the product has to be used for rotation, BUR is cut by 90°.

■ Case examples of defects and countermeasures

■ FAQ

‣FAQ about high performance elastomer is here
 ‣FAQ about the elastomer is here

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