Key Features

• Metal-Free Wetted Parts: The bellow is solid PTFE; the face is Ceramic, SiC, or filled PTFE. No metal parts contact the fluid.

• Stationary Design: The bellow is held stationary in the gland, which reduces fatigue and prevents the "whipping" effect common in rotating PTFE bellows.

• External Mounting: Typically mounted outside the stuffing box for easy inspection and corrosive protection.

• Composite Face Technology: Faces are integrally molded or inserted into the PTFE bellow, eliminating leak paths.

• Visual Wear Indicator: The external design allows operators to visually check the remaining seal face life without disassembly.

Product Specifications

Workshop

This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining to finished product delivery. It ensures part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.

Product Research, Development and Testing

Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.

Industry Solutions

FAQs

Q: Why stationary instead of rotating bellow?

A: PTFE flows (creeps) under stress. A rotating PTFE bellow is subjected to centrifugal force which can distort it. A stationary bellow is more stable and maintains its shape better over time.

Q: What makes a stationary face PTFE bellow mechanical seal different from a standard rotating bellow seal?

A: In a stationary face mechanical seal, the PTFE bellow is fixed in the gland rather than rotating with the shaft. This eliminates rotating-bellow fatigue, "whipping" at high speeds, and centrifugal distortion of the bellow—while keeping all wetted metal parts (spring, gland, drive pins) completely isolated from the process fluid. The result is a seal that handles aggressive acids and solvents without corrosion of metal components.

Q: Which aggressive chemicals and temperatures can this stationary face PTFE bellow seal handle?

A: The stationary face mechanical seal is purpose-built for hydrochloric acid pickling lines, sulfuric acid, nitric acid, organic solvents and medium-corrosion chemical pump service. The pure PTFE bellow and secondary seal resist chemical attack where elastomer O-rings would fail, while the 316SS spring and hardware remain outside the wetted area. Rated for –20°C to 200°C, ≤1.7 MPa and ≤25 m/s across shaft sizes 16–100 mm.

Q: What face material combinations are available for this stationary face PTFE bellow seal?

A: The stationary seat in this stationary face mechanical seal is offered in Ceramic (Al₂O₃), Silicon Carbide (SiC), Tungsten Carbide (TC) or filled PTFE, paired against a rotating face in Carbon graphite, SiC or TC depending on fluid chemistry and abrasivity. For extreme dry-run or low-lubricity duty, Diamond-Coated SiC faces are available as an option—all precision-lapped to hold leakage below 0.1 ml/h.