PRODUCT FEATURES
Union Elbow Ff Ptfe — Product Features
Suitable for use in food and beverage production lines, water treatment, pharmaceutical piping, light chemical processing, heating and cooling systems, marine piping, pump and valve connections, as well as process piping that requires frequent disassembly or 90° directional changes.
Product Feature
Buyer Information
Product Feature
For bulk orders, an EN 10204 3.1 material inspection certificate can be provided. OEM branding/custom marking is available. Samples can be supplied prior to mass production for dimensional verification and leak testing. Please confirm the thread type and specifications before placing an order. Spare PTFE gaskets are also available upon request.
OPERATING PRINCIPLE
How Union Elbow Ff Ptfe Works
1. 90° Female-Threaded Union Elbow: Features female threads at both ends and combines the functions of an elbow and a union, allowing for both a change in piping direction and convenient, rapid disassembly.
-
2. Flat-Seat PTFE Seal
Utilizes a replaceable, pure PTFE flat gasket, offering excellent chemical inertness and high-temperature resistance.
-
3. Three-Piece Construction
Comprises two elbow components and a hexagonal connecting nut, ensuring ease of installation and removal.
-
4. AISI 304 Stainless Steel
Provides superior rust resistance; suitable for use with fresh water, mildly corrosive media, and in outdoor environments.
-
5. Precision-Machined Threads
Available with BSPP, BSPT, or NPT thread options; thread tolerances comply with ISO 7-1, DIN 2999, or ANSI B1.20.1 standards.
-
6. PN20 (150LB) Pressure Rating
Complies with the ISO 4144 standard, maintaining a reliable seal under rated operating pressures.
-
7. Pickled and Passivated Surface
Ensures a clean surface finish and further enhances corrosion resistance; custom marking/labeling is available.
-
8. Comprehensive Size Range
Covers all sizes from 1/2″ to 2″ (DN15 to DN50).
ENGINEERING DATA
Technical Specifications
Technical data supplied for Union Elbow FF PTFE. Ratings and material combinations should be confirmed for the selected configuration.
| PARAMETER | SPECIFICATION |
|---|---|
| – Material | AISI 304 (1.4301 / ASTM A182 F304) |
| – Type | Female-threaded union elbow (with PTFE gasket), 90° flat-seat female-threaded union elbow |
| – Thread Standard | NPT (ANSI B1.20.1) / BSPT / BSPP (ISO 7/1, DIN 2999) |
| – Pressure Rating | PN16 (150LB, 16 bar) |
| – Standard | ISO 4144 |
| – Sealing | Pure PTFE flat gasket |
| – Surface Treatment | Pickled and passivated |
| – Operating Temperature | -20°C to +120°C |
MECHANICAL DIMENSIONS
Dimensions & drawings.
Compare connection size with the corresponding overall length, bore and handle clearance dimensions from the supplied drawing.
Dimension chart
| SIZE | L1 | L2 | L3 | L |
|---|---|---|---|---|
| 1/2 | 47.5 | 25 | 37 | 40 |
| 3/4 | 54.5 | 33 | 45 | 52 |
| 1 | 60 | 40 | 52 | 57 |
| 11/4 | 71.5 | 47 | 63 | 65 |
| 11/2 | 78.5 | 55 | 70 | 79 |
| 2 | 89 | 66 | 85 | 95 |
Refer to the supplied dimension chart.
APPLICATIONS
Applications
Applicable media: the supplied document lists the following fluids. Actual compatibility depends on selected materials, concentration, temperature, pressure and the specific service conditions.
Application – Water Circulation
Cooling water, circulating water, drinking water and neutral purified water.
Application – Steam Piping
Clean, low-temperature saturated steam, subject to the product’s confirmed temperature and pressure limits.
Application – Compressed Air
Compressed air and nitrogen; verify compatibility for each system.
PURCHASING SUPPORT
Frequently Asked Questions
Find answers to common questions about sizing, materials, threaded connections and operating conditions.
What is Union Elbow FF PTFE?
It is a 90-degree 3-piece flat seat union elbow. Both ends are female internal threads. The central joint is sealed by compressing a PTFE gasket between two flat faces, not metal taper seal. It changes pipeline direction by 90° and allows easy disassembly for maintenance without cutting pipes.
Important: It is different from regular threaded elbow and conical seat union elbow. Flat seat parts cannot mix with conical seat union parts.
2、What thread standards are available?
We support NPT (ASME B1.20.1), BSPT (Rc, EN10226), BSPP (G, ISO228-1).
Threads are NOT interchangeable. Please confirm thread standard and size before order.
3、What stainless steel grades can you supply?
Standard grades:
– 304 / CF8 for water, air and general low-corrosion applications
– 316 / 316L / CF8M for coastal, brine, chemical and chloride-containing media
Duplex, 321 and other special alloys are available upon custom request.
4、What standards and pressure rating?
Cast version follows ISO4144 / MSS SP-114, Class 150LB (PN16).
Forged bar machined version complies with ASME B16.11, available in 3000LB / 6000LB.
Pressure rating depends on material, wall thickness and production process.
5、Manufacturing process: casting or bar stock machined?
Standard stock items: lost wax investment casting.
High-pressure, high-purity or heavy-duty application: solid bar CNC machined at higher cost.
7、Can you provide MTC material certificate?
Yes, EN10204 3.1 MTC with heat number is available. EN10204 3.2 third-party certificate can be arranged at buyer’s extra cost.
8、Surface finish options?
Standard: pickled matte finish.
9、Can you do laser marking?
Yes. We can mark size, grade, heat number, customer logo or brand on the flats.
10、Packaging for sea shipment?
Male threads are protected by plastic thread caps. Packed into export cartons, then loaded on fumigated wooden pallets with waterproof stretch film to avoid scratch and thread damage.
11、What is the lead time?
Typically, shipments are dispatched within 7–15 days of receiving the deposit, depending on the order quantity.
12、How is quality controlled?
Raw material inspection → CNC machining → Thread inspection → Hydrostatic testing → Visual inspection → Final dimensional verification before packaging.
13、Which Incoterms are available for overseas buyers?
We offer FOB (Free On Board) terms, with the shipment originating from a Chinese port. We will provide a commercial invoice, packing list, and bill of lading for import customs clearance.
14、Which Incoterms are available for buyers?
We offer FOB (Free On Board) or CIF (Cost, Insurance, and Freight) terms, with shipments originating from a Chinese port. We will provide a commercial invoice, packing list, and bill of lading for customs clearance.
15、What should be done if the threads are found to be defective or do not meet requirements upon arrival?
Please provide photos, videos, and inspection records. We will assess the root cause; depending on the contractual terms, solutions may include product replacement, a partial refund, or a reshipment.
Union Elbow FF PTFE
304 Stainless Steel Female-Threaded Union Elbow (with PTFE Gasket) – 90-degree, flat-seat design, rated for PN16 / 150LB, compliant with the ISO 4144 standard.
This three-piece, 90-degree female-threaded union elbow utilizes a flat-seat PTFE (polytetrafluoroethylene) gasket for sealing. Combining the functions of an elbow and a union, it allows for both a change in piping direction and convenient disassembly. Constructed from 304 stainless steel, it offers excellent corrosion resistance and is suitable for industrial process piping systems. Material Test Certificates (MTC) are available.
Type: Union Elbow FF PTFE
Material: 304/316L stainless steel
Nominal diameter: 1/2”–2” (D8–DN100)
Rated pressure: 150LB
Connection type: Threaded connection (BSPT / BSPP / NPT)
