DN50~DN600 PN16 GGG40 Pneumatic Wafer PTFE Lined Butterfly Valve

Specification

No.	Part name	Material
1	Body	GGG40
2	Disc/shaft one piece	CF8M	1.4462	CF8M FEP lined	CF8 EPDM lined
3	Seat	PTFE,FPM,EPDM,PU,NBR		PTFE	EPDM
4	Seat Energizer	SR
5	Weather seal	NBR
6	Bearing	PTFE impregnated SS316L
7	Gland	PTFE
8	Screw	SS304
9	Belleville washer	SS304
10	Stuffing collar	SS316
11	O ring	FPM
12	V ring	PTFE

TECHNICAL DATA

Body style	wafer
Nominal diameter	2″ – 24″ (DN50mm – DN600mm)
Top flange	ISO5211
Operating pressure	16bar for DN50-DN200, 10bar for DN250-DN600
Temperature range	-20 °C to + 180 °C (depending on pressure, medium and material)
Flange accommodation	EN 1092 PN 6/PN10/PN16 ASME Class 150 AS 4087 PN10/ PN16 JIS 5K/10K
Operation	Hand lever, gear box, pneumatic actuator, electric actuator

Pneumatic actuator

action
Double acting Failure to maintain	Maintains position on air failure
Single acting normally closed Failure to close	Fails to open
Single acting normally open Failure to open	Fails to close
Optional accessory	Solenoid valve limit switch box air filter relief pressure valve, E/P positioned manual device.

SIZE		A	B	C	D	E	F	d	G	H	L	WT(kg)
DN	INCH	A	B	C	D	E	F	d	G	H	L	WT(kg)
50	2″	126	65	13.5	116	11	50	8	65	25	43	2
65	2 1/2″	138	79	13.5	136	11	50	8	65	59	46	3
80	3″	138	79	13.5	136	11	50	8	65	59	46	3
100	4″	167	97	17.5	170	14	70	10	90	86	52	5
125	5″	180	129	17.5	196	14	70	10	90	112	56	7
150	6″	203	142	18.5	227	17	70	10	90	140	56	8
200	8″	228	172	18.5	279	17	102	12	125	191	60	13
250	10″	266	213	24.5	336	22	102	12	125	241	58	22
300	12″	291	242	24.5	392	22	102	12	125	290	78	31
350	14″	332	262	30	445	27	125	14	150	331	78	44
400	16″	363	303.5	30	503	27	125	14	150	377	102	64
450	18″	397	324.5	39	553	36	140	18	175	425	114	86
500	20″	425	357	39	608	36	140	18	175	474	127	116
600	24″	498	419	49	717	46	165	22	210	570	154	179

Product Overview

I. Product Overview

TIANYU pneumatic PTFE lined wafer butterfly valve is a corrosion-resistant flow control solution engineered for aggressive media and industrial process systems. Featuring a GGG40 ductile iron body with PTFE lining, it combines chemical resistance with pneumatic actuation to ensure reliable shut-off and regulation of acids, alkalis, solvents, and other corrosive fluids. Designed with a wafer-style structure, it fits compact pipelines while achieving bubble-tight sealing. Suitable for chemical plants, oil refineries, and water treatment facilities, it balances durability, operational efficiency, and cost-effectiveness—eliminating the need for expensive alloy valves in corrosive environments.

II. Key Attribute Parameters

Size Range: DN50 ~ DN600 (2″ ~ 24″), covering medium to large-diameter pipelines for diverse flow control needs.
Pressure Range: 16bar (DN50 ~ DN200); 10bar (DN250 ~ DN600), adapting to low to medium pressure corrosive media systems.
Temperature Range: -20℃ ~ 180℃, compatible with PTFE and rubber seals for media with moderate temperature fluctuations.
Material Configuration:
- Body: GGG40 ductile iron (high strength, shock resistance) with PTFE lining (corrosion barrier for aggressive media).
- Disc & Shaft: One-piece structure, material options include CF8M (1.4462), CF8M FEP lined, CF8 EPDM lined—balancing strength and corrosion resistance.
- Seat: PTFE, FPM, EPDM, PU, NBR; PTFE for strong chemicals, rubber for general industrial media.
- Bearings: PTFE-impregnated SS316L (self-lubricating, corrosion-resistant).
- Actuator: Pneumatic (double acting/single acting), with single acting offering fail-safe (normally open/closed) functionality.
Connection Type: Wafer-style, fitting between pipeline flanges to save installation space.
Flange Compatibility: EN 1092 PN6/PN10/PN16, ASME Class 150, JIS 5K/10K, ensuring global pipeline integration.

III. Features Description

PTFE Lining Corrosion Resistance: The valve body and internal flow path are lined with PTFE—a material inert to most acids, alkalis, and solvents. This lining isolates corrosive media from the GGG40 body, eliminating metal corrosion and extending service life in chemical dosing or acid transfer systems.
Three-Layer Sealing System: Combines PTFE seat, siliccone, and V-ring packing to achieve bubble-tight shut-off (ANSI/FCI Class VI). The siliccone ensures stable sealing under pressure fluctuations, while the V-ring prevents external leakage at the shaft.
One-Piece Disc-Shaft Design: Integral construction reduces torque requirements by 20% compared to split designs, enhancing operational efficiency. It also eliminates leakage risks at the disc-shaft connection—critical for toxic or hazardous media.
Self-Lubricating Bearings: PTFE-impregnated SS316L bearings ensure precise disc-shaft alignment, reducing friction and wear during rotation. This design maintains smooth operation even in dusty or humid environments.
Pneumatic Actuation Flexibility: Double acting for continuous process control; single acting (spring-return) for safety—automatically returning to default position if air supply fails, preventing media overflow in unattended systems.

Valve Details

IV. Manufacturing Processes

Material Preparation: GGG40 castings undergo ultrasonic testing to detect internal defects. PTFE sheets are inspected for uniformity (no bubbles or impurities) to ensure corrosion resistance.
PTFE Lining Formation: The valve body interior is sandblasted to roughen the surface, then PTFE is molded and sintered (380℃ ~ 400℃) to bond tightly with the metal—preventing lining detachment under thermal expansion.
Disc-Shaft Machining: One-piece CF8M disc-shaft is precision-machined to ensure concentricity (±0.05mm), avoiding jamming during rotation. Lined disc options (FEP/EPDM) are coated via electrostatic spraying for uniform thickness (0.3mm ~ 0.5mm).
Seal Assembly: PTFE seats are lapped with the disc to achieve Ra ≤0.8μm surface contact, ensuring tight sealing. Silicon rubber energizers are installed behind seats to maintain pressure on sealing surfaces during temperature changes.
Testing:
- Pressure Test: Body tested at 1.5×rated pressure (water) for 30 minutes; seat tested at 1.1×rated pressure (air) to verify no leakage.
- Corrosion Test: PTFE-lined components immersed in 50% sulfuric acid for 72 hours—no lining damage or metal corrosion allowed.
- Actuator Cycle Test: 10,000+ open/close cycles under 6bar air supply to confirm smooth operation.

V. Product Advantages

Superior Corrosion Resistance: PTFE lining and SS316L components resist acids, alkalis, and solvents, reducing replacement costs by 40% compared to unlined metal valves in chemical applications.
Low Operational Torque: One-piece disc-shaft and self-lubricating bearings lower actuation energy requirements, ideal for energy-saving automated systems.
Bubble-Tight Sealing: Three-layer sealing and precision lapping achieve Class VI leakage, preventing hazardous media escape in pharmaceutical or toxic chemical processes.
Easy Maintenance: Wafer design simplifies installation/removal; components are disassemblable for material-specific recycling or replacement—minimizing downtime.
Safety Compliance: Single acting actuator’s fail-safe function and leak-proof design meet industrial safety standards for corrosive media handling.

Application

VI. Application Fields

Chemical Industry: Controls acids (sulfuric acid, nitric acid), alkalis (sodium hydroxide), and solvents in dosing, reaction, and transfer systems—PTFE lining resists chemical attack.
Oil Refining: Regulates corrosive by-products (e.g., amine solutions) in desulfurization processes, with PTFE avoiding degradation from sulfur compounds.
Water Treatment: Manages corrosive wastewater (e.g., heavy metal-containing effluent) and chemical disinfectants (chlorine, ozone)—preventing valve corrosion.
Pharmaceuticals: Handles high-purity solvents and cleaning agents, with PTFE ensuring no media contamination (meets FDA standards for indirect food contact).
Electroplating: Controls plating solutions (acids, metal salts) in coating lines, where corrosion resistance is critical for consistent process quality.