PTFE Wedge Mechanical Seals for Pump

PTFE wedge mechanical seals are purpose-built OEM-interchangeable replacements for AES T01, T03, T04, John Crane Type 9, Flowserve RO and similar chemical-service wedge seal configurations. Each ptfe mechanical seal is available in balanced and unbalanced variants, single or tandem (double) arrangements, with carbon graphite, silicon carbide or tungsten carbide face pairs depending on fluid chemistry and abrasivity.

Model:109B

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Key Features

• Universal Chemical Resistance: The PTFE wedge is inert to almost all industrial chemicals, solvents, and corrosive agents.

• High-Temperature Stability: Unlike rubber O-rings that can harden or melt, the PTFE wedge maintains its integrity up to 260°C.

• Robust Drive Mechanism: Uses a positive pin or set-screw drive to handle the higher friction and torque associated with ptfe mechanical seal wedge movement.

• Precision Machined Wedge: The angle and finish of the PTFE wedge are machined to micron-level tolerances to ensure it seats perfectly against the shaft without binding.

• Spring Energized: Multiple springs ensure even face loading and help the ptfe mechanical seal wedge maintain contact during thermal cycling.

Technical Specs		Materials
Mediums	Petroleum, chemical solvents, medium corrosion.	Stationary Ring	Ceramic/Sic/TC
Temperature	30℃ to 200℃	Rotary Ring	Carbon/Sic/TC
Pressure	≤2.5MPa	Secondary Seal	PTFE
Speed	≤25m/s	Spring and Metal Part	Stainless Steel

Product Specifications

Inch Shaft Size D1	Size Code	D1	D2	D3	D7	L1	L4	L3
0.625	0158	15.87	12.7	30.7	25.40	27	7.95	4.8
0.750	0191	19.05	15.9	34.0	31.75	30	10.3	4.8
0.875	0222	22.22	19.1	37.2	34.93	32	10.3	6.4
1.000	0254	25.40	22.2	40.3	38.10	33	10.3	6.4
1.125	0286	28.58	25.4	43.5	41.28	35	11.1	7.9
1.250	0317	31.75	28.6	48.3	44.45	35	11.1	7.9
1.375	0349	34.93	28.6	51.5	44.45	37	11.1	8.7
1.500	0381	38.10	31.8	54.6	47.63	37	11.1	8.7
1.625	0412	41.28	34.9	61.0	50.80	45	11.1	8.7
1.750	0444	44.45	38.1	64.2	53.98	45	11.1	9.5
1.875	0476	47.62	41.3	67.3	60.33	45	12.7	9.5
2.000	0508	50.80	44.5	70.5	63.50	45	12.7	9.5
2.125	0539	53.98	47.6	76.9	66.68	52	12.7	11.1
2.250	0571	57.15	50.8	80.0	69.86	52	12.7	11.1
2.375	0603	60.33	54.0	83.2	76.20	52	14.3	11.1
2.500	0635	63.50	57.2	86.4	79.38	52	14.3	11.1
2.625	0666	66.68	60.3	89.6	82.55	52	14.3	11.1
2.750	0698	69.85	63.5	92.7	85.73	52	14.3	11.1
2.875	0730	73.03	66.7	95.9	85.73	52	14.3	11.1
3.000	0762	76.20	69.9	97.5	88.90	52	15.9	11.1
3.125	0794	79.38	73.0	100.7	95.25	52	15.9	11.1
3.250	0825	82.55	76.2	105.4	98.43	52	15.9	14.3
3.375	0857	85.73	79.4	108.6	101.60	52	19.8	14.3
3.500	0889	88.90	82.6	111.8	104.78	52	19.8	14.3
3.625	0921	92.08	85.7	115.0	107.95	52	19.8	14.3
3.750	0953	95.25	88.9	118.1	111.13	52	19.8	14.3
3.875	0984	98.43	92.1	121.3	114.30	52	19.8	14.3
4.000	1016	101.60	95.3	124.5	117.48	52	19.8	14.3

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 of ptfe mechanical seal components to finished product delivery. Dedicated production lines for each ptfe mechanical seal model ensure part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements for chemical, pharmaceutical and high-temperature pump applications.

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Product Research, Development and Testing

Our Product R&D and Testing focuses on optimizing ptfe wedge 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

Case Study

Solvent Transfer: A paint factory was replacing FKM O-ring seals monthly due to solvent swelling. We installed our PTFE Wedge Seal. The inert PTFE material was unaffected by the ketones and acetates, extending seal life to over 2 years.

Testimonials

The only ptfe wedge seal that survives our aggressive solvent lines. The PTFE wedge design is simple but incredibly effective.

—Maintenance Manager, Chemical Plant

FAQs

Q: How does a PTFE wedge differ from an O-ring?

A: An O-ring is elastic and rolls or slides. A PTFE wedge is rigid and non-elastic; it forms a seal by being wedged into a conical space by spring force. It offers far superior chemical resistance but requires a smoother shaft finish and careful installation.

Q: Which pump seal types do PTFE wedge mechanical seals replace?

A: They are direct drop-in OEM-interchangeable replacements for AES T01, T03, T04, John Crane Type 9, Flowserve RO and similar chemical-service wedge seal configurations. The ptfe mechanical seal is available in balanced and unbalanced variants, single or tandem (double) arrangements, covering shaft sizes from 14 mm to 100 mm for ANSI and DIN chemical process pumps.

Q: Why choose a PTFE wedge over an elastomer O-ring for chemical pump sealing?

A: Unlike NBR, EPDM or FKM O-rings that swell, harden or dissolve in aggressive chemicals, the pure PTFE wedge in this ptfe mechanical seal is inert to virtually all acids, caustics, solvents and hydrocarbons. It also maintains its sealing integrity up to 260°C—far beyond the 120–200°C limit of standard elastomers—making it the only reliable secondary seal for severe chemical and high-temperature service.

Q: How does the PTFE wedge compensate for thermal expansion and shaft movement?

A: The precision-machined wedge angle allows the PTFE wedge to self-adjust radially under pressure, maintaining intimate contact with the shaft without binding. Multiple springs energize the face loading evenly, helping the ptfe mechanical seal track shaft runout and thermal cycling without the stick-slip behavior common to O-ring pusher seals. A positive pin or set-screw drive handles the higher friction torque of the PTFE wedge without slipping.