What is a fluorine-lined (PTFE lined) valve?

A fluorine-lined valve is an industrial valve with its wetted surfaces (body interior, ball/disc, stem) fully lined with fluoropolymer materials such as PTFE (Teflon), PFA, FEP, or ETFE. This lining provides exceptional chemical resistance against highly corrosive media including hydrochloric acid, sulfuric acid, nitric acid, hydrofluoric acid, and chlorine gas. The valve body is typically made of cast steel (WCB) with internal fluoropolymer lining to combine structural strength with chemical inertness.

What chemicals are PTFE lined valves suitable for?

PTFE lined valves are suitable for: hydrochloric acid (HCl), sulfuric acid (H2SO4), nitric acid (HNO3), hydrofluoric acid (HF), phosphoric acid, acetic acid, caustic soda (NaOH), chlorine gas (Cl2), bromine, hypochlorite solutions, organic solvents, and most aggressive chemicals with pH 1–14. PTFE is virtually chemically inert and has the widest chemical resistance among fluoropolymers.

What is the temperature limit of PTFE lined valves?

Standard PTFE lined valves are rated for -29°C to +180°C (-20°F to +356°F). PFA lined valves can operate up to +260°C (+500°F). ETFE lined valves are rated for -30°C to +150°C. For applications exceeding these temperatures, metal-seated valves or special alloy valves are recommended instead of fluoropolymer lined valves.

How to select the right fluorine polymer lining for my application?

Selection depends on: (1) Chemical type — PTFE for most acids, PFA for high-purity/pharmaceutical, FEP for excellent permeation resistance; (2) Temperature — PTFE up to 180°C, PFA up to 260°C; (3) Permeation risk — FEP or PFA for gases like chlorine; (4) Purity requirements — PFA for semiconductor/pharma; (5) Mechanical stress — ETFE for better abrasion resistance. TANGGONG engineers provide free lining selection consultation.

What certifications do TANGGONG fluorine-lined valves carry?

TANGGONG fluorine-lined valves are manufactured under ISO 9001:2015 quality management, comply with GB/T 12237, GB/T 12238, and API 609 design standards. High-voltage spark testing is performed on every lined valve to ensure lining integrity. CE marking and third-party inspection (SGS, TUV, BV) are available on request.

Fluorine-lined swing check valve

Name: TANGGONG Fluorine-Lined Valve Series
Brand: TANGGONG VALVE GROUP
Availability: InStock
Rating: 4.9 (41 reviews)

This type of valve functions to allow medium to flow in only one direction and block reverse‑direction flow. Normally, it operates automatically. Under the pressure of unidirectional fluid, the disc opens or closes accordingly.
Design and manufacture : GB/T12235/GB2236
Structure length : GB 12221 (Long-Short Series )
Flange size : JB/T78,JB/T79
Pressure test : GB/T13927
Nominal Pressure :PN0.6-1.6MPA
Nominal diameter :DN15-500MM

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Product Detail

Main spare part bill of materials：

NO.	Part name	Grey cast iron	Carbon Steel	Stainless steel	Stainless steel	Low carbon stainless steel	Low carbon stainless steel
NO.	Part name	Z	C	P	R	Pₗ	Rₗ
1	Body, cover, disc	Ht250	WCB	CF8	CF8M	CF3	CF3M
2	Lining layer	FEP(F46); PFA(Soluble PTFE); PCTFE(F3); PO(Polyolefin)
3	Pin	1Cr13/35; WCB; 1Cr18Ni9/CF8; 00Cr17Ni14Mo2/CF3M
4	Diaphragm	35	35	1Cr17Ni2	1Cr17Ni2	1Cr18Ni9Ti	1Cr18Ni9Ti

Main connection dimension and weight:

DN(mm)	NPS (inch)	L	D	D1	D2	f	b	Z-Φd	B	H	Weight(kg)
PN0.6MPa
15	1/2	130	80	55	40	2	12	4-Φ12	105	55	4
20	3/4	150	90	65	50	2	14	4-Φ12	115	58	5
25	1	160	100	75	60	2	14	4-Φ12	128	60	6
32	1 1/4	180	120	90	70	2	16	4-Φ14	145	75	7
40	1 1/2	200	130	100	80	3	16	4-Φ14	160	82	8
50	2	230	140	110	90	3	16	4-Φ14	178	95	10
65	2 1/2	290	160	130	110	3	16	4-Φ14	205	105	20
80	3	310	185	150	125	3	18	4-Φ18	230	120	25
100	4	350	205	170	145	3	18	4-Φ18	255	135	30
125	5	400	235	200	175	3	20	8-Φ18	305	158	50
150	6	480	260	225	200	3	20	8-Φ18	345	180	65
200	8	495	315	280	255	3	22	8-Φ18	415	215	137
250	10	622	370	335	310	3	24	12-Φ18	490	240	150
300	12	698	435	395	362	4	24	12-Φ23	540	265	185
350	14	787	485	445	412	4	26	12-Φ23	585	300	215
400	16	914	535	495	462	4	28	16-Φ23	635	360	244
450	18	978	590	550	518	4	28	16-Φ23	680	385	276
500	20	978	640	600	568	4	30	16-Φ23	740	415	315

1. The disc of the fluorine-lined check valve is in the shape of a disc and rotates around the shaft of the valve seat channel. Because the inner channel of the valve is streamlined, the flow resistance is smaller than that of the butterfly check valve. It is suitable for low flow rate and poor flow. It is suitable for large-diameter occasions with frequent changes, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of lifting type. Butterfly check valve is divided into three types: single-lobe type, double-lobe type and multi-half type. These three forms are mainly divided according to the diameter of the valve.

2. Fluorine-lined check valve: a check valve whose disc slides along the vertical centerline of the valve body. The muffler check valve can only be installed on horizontal pipelines, preferably on vertical pipelines. In high-pressure small-diameter check valves The upper disc can be a ball. The shape of the valve body of the muffler check valve is the same as that of the globe valve (it can be used in common with the globe valve), so its fluid resistance coefficient is larger. Its structure is similar to the globe valve, and the valve body and disc are the same as the globe valve. The upper part of the valve disc and the lower part of the valve cover are machined with guide sleeves. The valve disc guide can be freely lifted and lowered in the valve guide. When the medium flows downstream, the valve disc is opened by the thrust of the medium. It falls vertically on the valve seat to prevent the reverse flow of the medium. The direction of the medium inlet and outlet channels of the straight-through butterfly check valve is perpendicular to the direction of the valve seat channel; the vertical lift check valve has the same direction of the medium inlet and outlet channels as the valve seat channel, and its flow resistance is smaller than that of the straight-through type.

3. Fluorine-lined check valve: a check valve in which the disc rotates around the pin shaft in the valve seat. The disc check valve has a simple structure and can only be installed on horizontal pipelines with good sealing performance.

4. Fluorine-lined check valve: a valve in which the disc slides along the centerline of the valve body. Pipeline check valve is a new valve. It is small in size, light in weight and good in processing technology. It is one of the development directions of check valve. However, the fluid resistance coefficient is slightly larger than that of the swing check valve.

5. Compression check valve: This valve is used as a valve for boiler feed water and steam cut-off. It has the comprehensive function of a lift check valve and a globe valve or an angle valve.

In addition, there are some check valves that are not suitable for pump outlet installation, such as bottom valve, spring type, Y-type and other check valves.

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