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GRT Double-acting piston composite seal
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Piston GRT SILRING 15,00X7,50X3,20 PTBR40 (OR 7,59X2,62 NBR70) Double-acting
Family: GRT Double-acting piston composite seal
Dimensions : 7.50 x 15.00 x 3.20
Material: PTFE + BRONZE
Color:
BROWN
Part number: SPPT0150SPTBR40
Weight : 0.8000 gr.
Customs tariff code: 39269097
Country of origin: CN
Piston GRT SILRING 14,00X9,10X2,20 PTBR40 (OR 8,73X1,78 NBR70) Double-acting
Family: GRT Double-acting piston composite seal
Dimensions : 9.10 x 14.00 x 2.20
Material: PTFE + BRONZE
Color:
BROWN
Part number: SPPT0140SPTBR40
Weight : 0.4000 gr.
Customs tariff code: 39269097
Country of origin: CN
Piston GRT SILRING 18,00X10,50X3,20 PTBR40 (OR 9,19X2,62 NBR70) Double-acting
Family: GRT Double-acting piston composite seal
Dimensions : 10.50 x 18.00 x 3.20
Material: PTFE + BRONZE
Color:
BROWN
Part number: SPPT0180SPTBR40
Weight : 0.7000 gr.
Customs tariff code: 39269097
Country of origin: CN
Piston GRT SILRING 40,00X29,00X4,20 PTBR40 (OR 28,17X3,53 NBR70) Double-acting
Family: GRT Double-acting piston composite seal
Dimensions : 29.00 x 40.00 x 4.20
Material: PTFE + BRONZE
Color:
BROWN
Part number: SPPT0400SPTBR40
Weight : 4.4000 gr.
Customs tariff code: 39269097
Country of origin: CN
Piston GRT SILRING 40,00X32,50X3,20 PTBR40 (OR 31,42X2,62 NBR70) Double-acting
Family: GRT Double-acting piston composite seal
Dimensions : 32.50 x 40.00 x 3.20
Material: PTFE + BRONZE
Color:
BROWN
Part number: SPPT0400LPTBR40
Weight : 2.3000 gr.
Customs tariff code: 39269097
Country of origin: CN
Piston GRT SILRING 50,00X39,00X4,20 PTBR40 (OR 37,69X3,53 NBR70) Double-acting
Family: GRT Double-acting piston composite seal
Dimensions : 39.00 x 50.00 x 4.20
Material: PTFE + BRONZE
Color:
BROWN
Part number: SPPT0500SPTBR40
Weight : 5.5000 gr.
Customs tariff code: 39269097
Country of origin: CN
TECHNICAL DATA
| Seals | Profile | Material | Temperature | Speed | Pressure |
|---|---|---|---|---|---|
| SPPT | | PTFE + 40% BRONZE + NBR70 | -30 to +100 ºC | ≤5 m/s | ≤400 |
QUICK LINKS
SPPT - Double-acting piston composite seals
The SPPT piston seal is a combination of a filled PTFE ring (usually 40% bronze) and an energizing O-Ring. It is a technical development of the SPPT profile that can be used in the same housings and applications. The two sides of the seal are angled, enabling it to retain the compact, robust shape of standard piston seals, while retaining the flexibility needed to achieve maximum pressure-dependent compression. The angled edge, created by the special design of the cross-section, allows an additional degree of freedom for the joint.
Maximum compression is therefore always shifted to the area of the rim that is directly subjected to pressure. On the edge on the low-pressure side, the joint has only neutral stress zones, with no compressive load or shear stress, effectively reducing the risk of joint extrusion due to backlash. The resulting benefits are many: very good static sealing, greater safety in the presence of contaminated fluids thanks to greater clearance from extrusion, the possibility of using larger radial clearances (around 50%) depending on operating conditions.
- Standard material: PTBR40 (PTFE + 40% Bronze) + O-Ring NBR70
- Working temperature: -20 to +100/120 ºC
- Speed: <15m/s
- Pressure: <60MPa
INSTALLATION RECOMMENDATION
RECOMENDED HOUSINGS TABLE
Piston diametre øD H9 | Depth | Width | Radius | Radial gap S máx.* | C/S OR | ||||
Standard serie | Light-duty serie | Heavy-duty serie | ød h9 | L +0,20 | r | 10 Mpa | 20 Mpa | 40 Mpa | d2 |
8 - 14,90 | 15 - 39,90 |
| D - 4,90 | 2,20 | 0,40 | 0,40 | 0,30 | 0,20 | 1,78 |
15 - 39,90 | 40 - 79,90 |
| D - 7,50 | 3,20 | 0,60 | 0,60 | 0,50 | 0,30 | 2,62 |
40 - 79,90 | 80 - 132,90 | 15 - 39,90 | D - 11,00 | 4,20 | 1,00 | 0,70 | 0,50 | 0,30 | 3,53 |
80 - 132,90 | 133 - 329,90 | 40 - 79,90 | D - 15,50 | 6,30 | 1,30 | 0,80 | 0,60 | 0,40 | 5,33 |
133 - 329,90 | 330 - 669,90 | 80 - 132,90 | D - 21,00 | 8,10 | 1,80 | 0,80 | 0,60 | 0,40 | 6,99 |
330 - 669,90 | 670 - 999,90 | 133 - 329,90 | D - 24,50 | 8,10 | 1,80 | 0,90 | 0,70 | 0,50 | 6,99 |
670 - 999,90 |
| 330 - 669,90 | D - 28,00 | 9,50 | 2,50 | 1,00 | 0,80 | 0,60 | 8,40 |
*At pressures > 40Mp, it is recommended to use the diametral tolerance h8/f8 on the back of the seal