SPGW Combined Seal CT Heavy-Duty Capped Seal Metric & Inch Size for Excavator Cylinder

1. Product Overview

SPGW is a high‑performance double‑acting compact piston seal for hydraulic cylinder pistons, widely adopted in heavy‑duty mobile hydraulics and construction machineryDSH Seals. This 4‑piece assembly consists of bronze‑filled PTFE sliding ring, T‑shaped NBR/FKM energizer and two POM anti‑extrusion backup rings. It delivers reliable bidirectional sealing within one single piston groove, saving piston machining cost and shortening overall piston lengthTYS seals.

We supply both metric and inch sizes, standard stocks available, custom dimensions also supported upon drawings or samples.

2. Key Features

• Double‑acting sealing for piston, withstand pressure up to 50 MPa
• Low friction, no stick‑slip / crawling during reciprocating movement
• Excellent anti‑extrusion performance, tolerant of larger hardware clearance
• Double‑sided POM backup rings prevent PTFE extrusion under high shock‑pressure
• Fit integral‑type piston with simple single‑groove installation
• Good wear resistance, works with slightly contaminated hydraulic media

3. Technical Parameters

• Max working pressure: ≤ 50 MPa
• Reciprocating speed: ≤ 1.5 m/s
• Temperature range:  NBR: ‑30 ℃ ~ +120 ℃  FKM: ‑20 ℃ ~ +200 ℃
• Compatible media: mineral hydraulic oil, fire‑resistant fluid, water‑glycol, compressed air

4. Material Options

1. Sliding ring: Bronze‑filled PTFE ; carbon / MoS₂ filled PTFE optional
2. Energizer: NBR ; FKM 
3. Backup ring: POM ; Nylon

5. Typical Applications

Excavators, loaders, mining machinery, metallurgical equipment, hydraulic presses, injection molding machines, heavy‑duty standard hydraulic cylinders, mobile hydraulic equipment and other reciprocating piston sealing conditions.

6. Order Note

Order format: SPGW + Bore × Groove OD × Groove Width. Metric and inch sizes in stock, custom sizes acceptable. Send us your drawing for quotation.