Diaphragm Valves

                          

Our Diaphragm Valves are known for their reliability and high performance in corrosive and abrasion resistance offering features which allow for 100% leak tightness and low cost maintenance in severe service application

We offer both “Weir” type and “Straight through” type diaphragm valves which offer various anti corrosion and abrasion protection solutions with different type of materials linings and coatings including:

1. Glass lining
2. Halar (ECTFE) coating
3. Rubber lining
4. Epoxy coating
5. Rilsan (Nylon 11) coating
6. Plascoat (polyster) coating
7. Plastic lining like – ETFE, PFA etc.
8. Stainless steels – SS416, SS304, SS316

Our Diaphragm valves can be designed to cater for various applications in process industries including mining, chemical, petrochemical, Food and Beverage, Water treatment plants, Filtration & Desalination plants etc.

Pressure Rating:  PN 2 ½ – PN 16
Sizes: ¼” – 14” (15mm – 350mm)
We offer ¼” to 8” (15mm – 200mm) as standard. Other sizes up to 350mm can be manufactured as per client requirements

Advantages of our Diaphragm Valves:

• The operating parts of the valve are isolated from the fluid preventing any possibilities of corrosive contamination.
• The over –closure protection system avoids diaphragm tampering due to excessive force that can be applied during valve closure.
• No packing gaskets used inside the valve’s body, which eliminates leak path and deep corrosion.
• Inbuilt open/closed indicator system.
• Easy maintenance procedures allow cleaning and diaphragm changing without removing the valve from the line even if it is in open position.
• The vast variety of linings and coatings, together with many diaphragm combinations, makes the valve suitable to handle nearly any fluid under the most severe conditions.
• Suitable to operate in vacuum implementations.
• Suitable for most connection possibilities to the pipes (all flange drilling systems, screws and welding).
• Valve’s shaft is made of stainless steel 304 as standard for best corrosion resistance.
• Designed for low operating torques for saving energy.

Actuation options:

In addition to handwheel operation our diaphragm valves can be automated using a variety of actuation systems. Pneumatic actuation is achieved by piston/cylinder or diaphragm operation; both can be fitted with a wide range of accessories including:

Solenoid valves
Switch enclosures
Electro-pneumatic positioners
Limit stops
Emergency hand wheel over-rides.
Electric actuators are available in a wide range of voltages and configurations and we offer a range of worldwide renowned brands of valve electric actuators.
Automation/control packages can be available to suit your specific process conditions, offering tailored features to optimise production and minimise maintenance downtime.

 

STRAIGHT – THROUGH TYPE DIAPHRAGM VALVE.

                                                      

Working pressure:  PN 3.5 / PN6 / PN10.
Size: 1" – 12" ( 25 -300mm ).
Body: Cast iron, Ductile iron, stainless steel.
Bonnet: Cast iron, Stainless steel.
Compressor: Cast iron, Stainless steel.
Stem: Stainless steel – AISI 304, AISI 316.
Diaphragm: NBR, EPDM, Butyl, Hypalon, Viton rubber, PTFE and more*.
Coating: Epoxy, Halar, Glass, Rilsan, Butyl, Soft natural rubber, Hard natural rubber, etc.

 

WEIR TYPE RUBBER and PTFE DIAPHRAGM VALVE.

Teflon lined Weir Diaphragm	Cut Weir Type Diaphragm	Unlined Weir Type Diaphragm

 

Working pressure:  PN 7/PN10/PN16.
Diameter: 0.5" – 14" (15 -350mm).
Body: Cast iron, Ductile iron, stainless steel.
Bonnet: Cast iron, Stainless steel.
Compressor: Cast iron, Stainless steel.
Stem: Stainless steel – AISI 304, AISI 316.

 

Body Linings and Coatings – Selection & typical applications
	Code	Material Name	Suitable Temperatures	Typical Services
1	UL	Unlined (Epoxy coated)	"-20 to 80c	Good acids, natural salts and alkalis resistance, suitable for food and water
2	SR	Soft Rubber	-40 to 100c	General purpose, abrasives, water and diluted mineral acids
3	HR	Hard Rubber	"-40 to 100c	General purpose, good acids and alkaline resistance.
4	BR	Butyl Rubber	"-20 to 120c	Good acids, alkali resistance including sulphuric acid
5	NR	Neoprene Rubber	"-30 to 105c	Weak Chemicals and greases
6	HY	Chlorosulfonated polyethylene CSM Hypalon Rubber	-20 to 100c	Concentrated acids and Alkalis
7	EPDM	EPDM/Black	"-40 to 140c	General Purpose, resistant to high temperatures, most corrosive chemicals, and abrasive liquids.
8	ETFE	Ethylene Tetraflourethlene tefze	"-20 to 150c	High Chemical resistance, abrasion resistant, suitable for food.
9	PFA	Perflouroalkoxy	"-20 to 175c	High Chemical resistance, high temperature stability, suitable for food.
10	PVDF	Polyvinylidene Floride	"-20 to 130c	Resistant to most inorganic acids & bases of moderate concentration, sodium hypo-chlorite service.
11	PP	Polypropylene	"-30 to 85c	Mineral acids, salts in water, water and effluent treatment chemicals
12	GL	Glass	"-10 to 175c	High chemical resistance, abrasion resistant, high temperature stability, suitable for food
13	ECTFE	Ethylene Chlorotrifloroethylene (Halar)	"-20 to 130c	High chemical resistance to mineral & oxidizing acids, alkali, salts & nearly all solvents, high corrosive acids
14	Nylon11	Rilsan	"-20 to 80c	Portable water, sea water, water treatment chemicals
Diaphragm – Selection & typical applications
	Grade	Material Name	Suitable Temperatures C		Typical Services
1	10	Natural Rubber	-40 to 100c		General purpose, Abrasives, water, diluted mineral acids, slurry and suspended solids.
2	11	Natural Rubber Composite	-40 to 100c		Abrasives, slurries and suspended solids
3	20	EPDM/Black	-40 to 140c		General purpose, resistant to high temperatures, corrosive chemicals, and abrasive liquids.
4	2F	EPDM/Food	-30 to 120c		Food and pharmaceuticals
5	30	Butyl Rubber	-20 to 120c		Acids, alkalis, hot water, low pressure steam.
6	40	Nitrile Rubber	-20 to 100c		Oils, Fats and fuels
7	50	Neoprene	-30 to 105c		Air, weak chemicals and greases
8	60	Hypalon	-20 to 100c		Concentrated acids and Alkalis, chlorine services
9	70	Viton FPM	-20 to 150c		Concentrated sulphuric and other acids, aromatic hydrocarbons, chlorine services.
10	80	Silicone	-30 to 175c		Moderate or oxidizing chemicals, ozone, concentrated sodium hydroxide. Recommended for foods
11	93/20	PTFE/EPDM backed	-30 to 175c		Highest Chemical and Temperature resistance
12	93/30	PTFE/Butyl backed	-30 to 150c		Highest Chemical and Temperature resistance
13	93/60	PTFE/Hypalon backed	"-20 to 120		Highest Chemical and Temperature resistance
14	93/70	PTFE/Viton backed	"-20 to 175c		Highest Chemical and Temperature resistance