Fluorine Lined Check Valve

Product Overview

Fluorine lined check valve is a type of automatic valve that relies on the flow of the medium itself to open and close the valve disc automatically, preventing backflow of the medium.

Product Features

• The types of swing check valves include H44F46 and H74F46 fully lined single-disc swing series, and H76F46 double-disc swing series. These valves rotate and open/close around the axis outside the seat to prevent backflow. The H44F46 and H74F46 types feature an integrated shaft and disc, with the shaft fully lined with FEP and embedded in a special groove between the body and bonnet, allowing flexible operation and reliable sealing. The H72F46 and H76F46 types have the body, disc, and return spring fully lined with corrosion-resistant fluoroplastics. The spring is reasonably designed to ensure sufficient sealing pressure at low pressure, guaranteeing sealing performance.

• Lift check valve: main types include H40F46, H42F46, and H72F46. Among them, H40F46 is a newer type with a semi-ball disc design. A common feature is that the fluoroplastic-lined disc moves up and down along the valve axis.

• The main type of lifting check valve is the fully lined H41F46 lifting check valve, characterized by a fluoroplastic-lined disc that moves vertically along the axis of the inlet.

Executive Standard

Design and manufacture	GB 12239
Face to face	GB/T 12221
Flange dimension	JB 78 (or according to contract)
Pressure test	GB/T 13927
Symbol	GB 12220
Supply	GB/T 12252

Main Parts Material Specifications

No.	Parts name	Grey cast iron (Z)	Carbon steel (C)	Stainless steel (P)	Stainless steel (R)	Low carbon SS (PL)	Low carbon SS (RL)
1	Body, Bonnet	HT250	WCB	CF8	CF8M	CF3	CF3M
2	Lining / Seat	—	FEP (F46)	PCTFE (F3)	PFA	PO	—
3	Shaft, Wedge	—	1Cr13 / 35 / WCB	1Cr18Ni9 / CF8	00Cr17Ni14Mo2 / CF3M	—	—
4	Bolt	35	35	1Cr17Ni2	1Cr17Ni2	1Cr18Ni9Ti	1Cr18Ni9Ti
5	Nut	45	45	0Cr18Ni9	0Cr18Ni9	0Cr18Ni9	0Cr18Ni9

Fluorine Lined Check Valve

Main Dimension

PN0.6 (MPa)

DN	NPS	L	D	D1	D2	f	b	Z-φd	B	H	W (kg)
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

PN1.0 (MPa)

DN	NPS	L	D	D1	D2	f	b	Z-φd	B	H	W (kg)
15	1/2	130	95	65	45	2	14	4-φ14	105	55	5
20	3/4	150	105	75	55	2	16	4-φ14	115	58	7
25	1	160	115	85	65	2	16	4-φ14	128	60	9
32	1 1/4	180	135	100	78	2	18	4-φ18	145	75	11
40	1 1/2	200	145	110	85	3	18	4-φ18	160	82	13.5
50	2	230	160	125	100	3	20	4-φ18	178	95	18
65	2 1/2	290	180	145	120	3	20	4-φ18	205	105	22
80	3	310	195	160	135	3	22	4/8-φ18	230	120	28
100	4	350	215	180	155	3	22	8-φ18	255	135	34
125	5	400	245	210	185	3	24	8-φ18	305	158	58
150	6	480	280	240	210	3	24	8-φ23	345	180	72
200	8	495	335	295	265	3	26	8-φ23	415	215	150
250	10	622	390	350	320	3	28	12-φ23	490	240	165
300	12	698	440	400	368	4	28	12-φ23	540	265	190
350	14	787	500	460	428	4	30	16-φ23	585	300	225
400	16	914	565	515	482	4	32	16-φ25	635	360	254
450	18	978	615	565	532	4	32	20-φ25	680	385	285
500	20	978	670	620	585	4	34	20-φ25	740	415	333

PN1.6 (MPa)

DN	NPS	L	D	D1	D2	f	b	Z-φd	B	H	W (kg)
15	1/2	130	95	65	45	2	14	4-φ14	110	55	6
20	3/4	150	105	75	55	2	16	4-φ14	120	58	7.8
25	1	160	115	85	65	2	16	4-φ14	135	60	10
32	1 1/4	180	135	100	78	2	18	4-φ18	150	75	12.5
40	1 1/2	200	145	110	85	3	18	4-φ18	165	82	14.5
50	2	230	160	125	100	3	20	4-φ18	185	95	19.5
65	2 1/2	290	180	145	120	3	20	4-φ18	210	105	25.5
80	3	310	195	160	135	3	22	8-φ18	235	120	30
100	4	350	215	180	155	3	24	8-φ18	260	135	36
125	5	400	245	210	185	3	26	8-φ18	310	158	62
150	6	480	280	240	210	3	28	8-φ23	350	180	78
200	8	495	335	295	265	3	30	12-φ23	420	215	156
250	10	622	405	355	320	3	32	12-φ25	505	240	172
300	12	698	460	410	375	4	34	12-φ25	560	265	240
350	14	787	520	470	435	4	38	16-φ25	605	300	208
400	16	914	580	525	485	4	40	16-φ30	650	350	265

Fluorine Lined Check Valve

Executive Standard

Item	Standard / Specification
Design and manufacture	GB 12235
Face to face	Enterprise standard
Flange dimension	JB 78 / JB79 (or according to contract)
Pressure test	GB/T 13927
Symbol	GB 12220
Supply	GB/T 12252

Main Dimensions

PN0.6 (MPa)

DN	NPS	L	D	D1	D2	f	b	Z-φd	W (kg)
15	1/2	135	80	55	40	2	12	4-φ12	2.5
20	3/4	145	90	65	50	2	14	4-φ12	3.5
25	1	155	100	75	60	2	14	4-φ12	4
32	1 1/4	170	120	90	70	2	16	4-φ14	5
40	1 1/2	183	130	100	80	3	16	4-φ14	6
50	2	185	140	110	90	3	16	4-φ14	8
65	2 1/2	196	160	130	110	3	16	4-φ14	10
80	3	212	185	150	125	3	18	4-φ18	13
100	4	275	205	170	145	3	18	4-φ18	25
150	6	405	260	225	200	3	20	8-φ23	46
200	8	510	315	280	255	3	22	8-φ23	100
250	10	622	370	335	310	3	24	12-φ23	155
300	12	698	435	395	362	4	24	12-φ23	180
350	14	787	485	445	412	4	26	12-φ23	220
400	16	914	535	495	462	4	28	16-φ23	275
450	18	978	590	550	518	4	28	16-φ23	300
500	20	978	640	600	568	4	30	16-φ23	392

PN1.0 (MPa)

DN	NPS	L	D	D1	D2	f	b	Z-φd	W (kg)
15	1/2	135	95	65	45	2	14	4-φ14	2.5
20	3/4	145	105	75	55	2	16	4-φ14	3.5
25	1	155	115	85	65	2	16	4-φ14	4
32	1 1/4	170	135	100	78	2	18	4-φ18	5
40	1 1/2	183	145	110	85	3	18	4-φ18	6
50	2	185	160	125	100	3	20	4-φ18	8
65	2 1/2	196	180	145	120	3	20	4-φ18	10
80	3	212	195	160	135	3	22	4/8-φ18	13
100	4	275	215	180	155	3	22	8-φ18	25
150	6	405	280	240	210	3	24	8-φ23	46
200	8	510	335	295	265	3	26	8-φ23	100
250	10	622	390	350	320	3	28	12-φ23	155
300	12	698	440	400	368	4	28	12-φ23	180
350	14	787	500	460	428	4	30	16-φ23	220
400	16	914	565	515	482	4	32	16-φ25	275
450	18	978	615	565	532	4	32	20-φ25	300
500	20	978	670	620	585	4	34	20-φ25	392

PN1.6 (MPa)

DN	NPS	L	D	D1	D2	f	b	Z-φd	W (kg)
15	1/2	135	95	65	45	2	14	4-φ14	2.5
20	3/4	145	105	75	55	2	16	4-φ14	3.5
25	1	155	115	85	65	2	16	4-φ14	4
32	1 1/4	170	135	100	78	2	18	4-φ18	5
40	1 1/2	183	145	110	85	3	18	4-φ18	6
50	2	185	160	125	100	3	20	4-φ18	8
65	2 1/2	196	180	145	120	3	20	4-φ18	10
80	3	212	195	160	135	3	22	4-φ18	13.5
100	4	275	215	180	155	3	24	8-φ18	28.5
150	6	405	280	240	210	3	28	8-φ23	48
200	8	510	335	295	265	3	30	8-φ23	105
250	10	622	405	355	320	3	32	12-φ23	165
300	12	698	460	410	375	4	34	12-φ25	195
350	14	787	520	470	435	4	38	12-φ25	238
400	16	914	580	525	485	4	40	16-φ30	295

PN2.5 (MPa)

DN	NPS	L	D	D1	D2	f	b	Z-φd	W (kg)
15	1/2	135	95	65	45	2	16	4-φ14	3
20	3/4	145	105	75	55	2	16	4-φ14	4
25	1	155	115	85	65	2	16	4-φ14	5
32	1 1/4	170	135	100	78	2	18	4-φ18	8.5
40	1 1/2	183	145	110	85	3	18	4-φ18	9.8
50	2	185	160	125	100	3	20	4-φ18	17

Manufacturing Process

Step 1: Order and Design

According to customer requirements, the basic specifications of the valve are confirmed, including size, pressure rating, body material, lining material, flange standard, and working conditions. For fluorine lined check valve, special attention is paid to the corrosion resistance of the fluorine lining and the compatibility with the medium, so that the design can ensure both sealing performance and service life.

Fluorine Lined Check Valve

Step 2: Forging & Casting

The main pressure-bearing parts such as valve body, bonnet, and disc are produced by casting or forging according to the design drawings. During this process, material quality and dimensional accuracy are strictly controlled to provide a stable base for the later processing of the fluorine lined check valve.

Fluorine Lined Check Valve

Step 3: Machining

After casting or forging, all components are machined, including flange facing, inner cavity finishing, drilling, threading, and sealing surface preparation. For fluorine lined check valve, machining accuracy is especially important, because it directly affects the lining fit, assembly quality, and final sealing performance.

Fluorine Lined Check Valve

Step 4: Assembly

After all parts are cleaned and inspected, the valve body, disc, bonnet, gasket, and other components are assembled in sequence. During the assembly of the fluorine lined check valve, extra care is taken to protect the fluorine-lined surface from scratches, deformation, or damage.

Fluorine Lined Check Valve

Step 5: Testing & Quality Assurance

Each finished valve undergoes pressure testing, sealing testing, appearance inspection, and dimensional inspection. For fluorine lined check valve, lining integrity and leakage performance are key checkpoints to ensure the valve can work safely and reliably in corrosive service conditions.

Fluorine Lined Check Valve

Step 6: Painting and Finishing

After final inspection, the external surface is cleaned, painted, marked, and packed according to customer or project requirements. Nameplate, model, pressure rating, and inspection status are clearly identified before shipment.

Fluorine Lined Check Valve

Applications

The fluorine lined check valve is suitable for installation in vertical pipelines. It is applicable to various concentrations of aqua regia, sulfuric acid, hydrochloric acid, hydrofluoric acid, and various organic acids, strong acids, strong oxidants within the temperature range of -50℃ to 150℃. The FEP vertical fluorine-coated check valve is also suitable for use in pipelines with various concentrations of strong alkaline organic solvents as well as other corrosive gases and liquid media.

These valves are widely used in:

Oil and Gas

Chemical Processing

Power Plants

Water Treatment

Metallurgy and Mining

Agriculture and Irrigation

Factory Environment

Factory Production Line

Material Storage

Quality Control

Assembly Workshop

Quality Control

Assembly Workshop

Why Choose Us

Superior Quality

Our valves are manufactured using premium materials and undergo rigorous quality testing to ensure reliable performance in demanding industrial applications.

Advanced Technology

Equipped with state-of-the-art CNC machining centers and precision manufacturing equipment, we deliver valves with exceptional accuracy and consistency.

Competitive Pricing

Through optimized manufacturing processes and bulk material procurement, we offer high-quality valves at competitive prices without compromising on quality.

Expert Support

Our experienced technical team provides comprehensive support from product selection to after-sales service, ensuring optimal valve performance for your specific application.

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