Product Description:

Chemical pipework punishes the wrong elastomer quickly. A standard rubber sphere on acid or solvent duty swells, softens and then fails at the flange, and the leak usually shows up in the worst place at the worst time. A PTFE liner removes that failure path: the medium meets a surface it cannot attack, while the rubber behind it continues to absorb movement and vibration.

This DN150 (6 inch) flange type joint carries a PTFE liner through the full bore. The flange ends are drilled to DIN, ANSI or JIS and machined flat so the gasket seats cleanly, and the length is set on the approval drawing to suit the gap you actually have in the pipe run.

Applications:

• Acid and alkali transfer lines in chemical plants
• Chlor-alkali, fertilizer and dye intermediate service
• Effluent neutralisation and wastewater treatment headers
• Pickling lines and plating shop pipework
• Solvent and oxidising media where plain rubber would swell
• Pump discharge on chemical dosing skids

Product Features:

• PTFE liner inside the bore, so the medium never reaches the rubber
• Liner handles acid, alkali, oxidising and solvent media that attack plain compounds
• Smooth, non-stick liner surface resists scale build-up and eases cleaning
• Rubber body underneath still gives axial, radial and angular movement plus vibration isolation
• Flange ends drilled to DIN, ANSI or JIS, machined flat for a reliable gasket seat
• Face-to-face length confirmed on the approval drawing, as lining thickness affects overall build

Technical Parameters:

Advantages:

• Thirty-six years of joint manufacture, with compound and liner selected against the actual chemical service
• Own rubber mixing centre, so the body compound behind the liner is controlled batch by batch
• Galvanized steel wire and multi-layer nylon cord fabric carcass for pressure retention at 6 inch bore
• Participant in drafting GB/T26121-2010, the national standard covering flexible rubber joints
• Utility model patent on the joint body, patent number 032418558
• Liner inspected for pinholes and bond before the flanges are closed out

Support and Services:

• Hydrostatic, dimensional, material and packing checks before every shipment
• 12-month warranty, with TUV, SGS or BV third-party inspection on request
• Free selection advice on compound and liner, plus free approval drawings
• Plastic film sleeve inside a plywood case, steel frame added when several units travel together
• Round-the-clock online support, after-sales answer inside one hour
• Online factory inspection welcome, free samples for evaluation

FAQ:

Q1: What does the PTFE lining actually protect?

A1: It keeps the chemical away from the rubber. On acid, alkali or solvent service a plain rubber sphere would swell, harden or break down; with the liner in place the medium only meets PTFE, while the rubber underneath still does the movement and vibration work.

Q2: Is the 6 inch face length the same as the unlined version?

A2: Not always. Lining thickness changes the overall build, so the exact face-to-face length is fixed on the approval drawing. Send your available pipe gap and we design the joint to fit that space.

Q3: Which body compound sits behind the liner?

A3: EPDM, NBR, NR or FKM depending on temperature and any secondary exposure. Tell us the medium, concentration and working temperature and we specify the combination.

Q4: How is the lined joint tested?

A4: The liner is checked for pinholes and bond first, then the finished unit undergoes a hydrostatic proof test at 1.5 times the working pressure together with dimensional and visual checks.

Q5: What is the order quantity and lead time?

A5: One set is accepted and price improves with quantity. Lined joints normally need 15-30 working days after payment because of the extra lining stage.