PTFE-Lined Pneumatic Diaphragm Valve

Brief Introduction to Diaphragm Valve

A diaphragm valve uses a flexible diaphragm and a valve body with a flow chamber to achieve opening, closing, and flow regulation. The valve is operated by pressing the diaphragm down onto the weir or seat, or lifting it to allow flow, which ensures a streamlined passage and prevents direct contact between the fluid and the valve’s moving parts. Lined diaphragm valves or diaphragm assemblies made of high-performance polymer materials provide exceptional corrosion resistance, making them suitable for strong acids, strong alkalis, salts, oxidizing and reducing agents, and a wide range of organic media.

Diaphragm valves are ideal for shut-off and regulating applications in pipelines carrying highly corrosive, viscous, or particulate-laden media. They are widely used in chemical industry, pharmaceuticals, biotechnology, food and beverage, water treatment, chlor-alkali systems, and other industries requiring high cleanliness and reliable corrosion resistance. They can replace ball valves, globe valves, and other regulating valves in demanding fluid control environments.

Design Features

Compact Piston-Actuated Pneumatic Diaphragm Valve The valve is powered by compressed air and features a packing-free design with an elastomeric diaphragm as the throttling element. Its streamlined flow path ensures minimal flow resistance and maximum flow capacity.
Diaphragm Isolation System The diaphragm effectively separates the lower valve chamber from the upper bonnet chamber, protecting stem and disc components above the diaphragm from media corrosion while eliminating external leakage. This innovative design removes the need for traditional stuffing box sealing arrangements.
FEP-Lined Corrosion Resistant ConstructionFeaturing diaphragms made of FEP fluoropolymer-rubber composite and valves with FEP lining, this series is suitable for handling highly aggressive media, with the exception of molten alkali metals and elemental fluorine.

Technical Specifications
Design & Manufacturing	QB/T12239-89 BS5156
Design Standards	JB/T82.1-94 GB9113.3-88
Face-to-Face Dimensions	GB12221-89
Inspection & Testing Standards	GB/T13927-92

Technical Parameter
Nominal Diameter (DN)	DN15~DN150
Connection Type	Flanged
Actuator Sizing	Gemü-type piston actuator (spring return) or diaphragm actuator
Control Method	2-position shut-off (ON/OFF) or modulating control
Nominal Pressure (PN)	6bar、16bar
Supply Pressure	5~7bar
Media Temperature	-29~160℃
Ambient Temperature	-20~60℃
Body Material	Carbon steel (C), Stainless steel (P, PM, PL)
Seat/Seal Material	EPDM+PTFE

Main connection dimensions
Nominal Diameter (DN)	H （High）	D1 （Flange outer diameter）	D （Diameter of flange screw hole）	L （Valve body length）	n （Number of flange holes）	C （Hole size）	B （Flange thickness）
15	215	65	95	125	4	14	14
20	220	75	105	135	4	14	16
25	225	85	115	145	4	14	16
32	240	100	135	160	4	18	16
40	285	110	145	180	4	18	16
50	307	125	160	210	4	18	18
65	327	145	180	250	4	18	22
80	390	160	195	300	4	18	25
100	470	180	215	350	8	18	25
125	637	210	245	400	8	18	30
150		240	280	460	8	23	30
200		295	335	570	8	23	35

Attachment selection
Solenoid valve	For double-acting, select 2-position 5-way; for single-acting, select 2-position 3-way.Specify single solenoid control or double solenoid control when placing an order.
Pneumatic filter regulator lubricator (FRL unit)	Stabilizes air pressure, filters air source, and lubricates cylinders.
Limit switch	Provides remote feedback of switch signals.
Manual operating mechanism	Enables manual opening and closing of the valve.
Positioner	Inputs analog signals (4-20mA or 0-10V) to regulate the valve opening.

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