How to choose right butterfly valve: corrosion, abrasion, clogging, contamination, vacuum & gas handling

Hand and pneumatic operated butterfly valves are quick opening valves that consist of a metal disc (lined where necessary) with its pivot axes at right angles to the direction of flow in the pipe.
They are leaktight on all liquids, slurries, granular materials, powders, pastes, gases acids etc…
Seat and disc are easily replaceable without any special tools. The wide range of available elastomer materials enables an appropriate selection for each application and is guarantee of perfect resistance to corrosion and abrasion.

PERFORMANCE FEATURES

RESILIENT SEATED CONCEPT

• Lower risk of damage due to tuberculation then metal on metal concept valve
• Long seat life: no metallic inserts to strain the elastomers
• Body valve designed and manufactured in one or two parts
• Special two parts body valve for quick and easy replacement of seat and disc
• No maintenance
• Long durability
• Epoxy painted, valve bodies protected with an anti-acid varnish

METAL ON METAL CONCEPT

• Metal seated valve for high temperature
• Body valve designed and manufactured in one part
• PTFE seated valve only available for temperature up to 200°

DISC MATERIALS

• Hard rubber lined A216 WCB carbon steel
• PFA lined
• Rilsan lined
• HALAR/ECTFE lined 304 or 316 or marine 316 Stainless steel
• SS 304; SS 316; SS 316 L
• Ductile iron
• Hastelloy C
• Aluminum bronze
• Duplex
• PVDF, PPH

1. Water treatment & supply plants

Water treatment comprises physical, chemical and biological processes in accordance with the substances contained in the water to be treated.

2. Irrigation Systems

Their main function is to control water flow. Several valves allow the control of opening and closing operations and the modulation of the velocity in the flow through the system and the prevention of backflow. They may also be used to relieve pressure or as a safety device. In general, valves can vary from simple manual opening devices to sophisticated control equipment that act as measuring instruments and deliver predetermined amounts of water to the system.

3. Sewage and wastewater plants

Wastewater from homes or agriculture does not contain the same substances as industrial wastewater. In the food industry, the composition of wastewater is different to that in the chemical industry. There is no generalised standard for the classification of wastewaters. Consequently, in this sector special valves and know-how required. At NEWSUNUP we help you to select the most appropriate materials – from those required for coating the body to sealing materials.

4. Fire Fighting

Our fire fighting protection products provide a high precision, reliable service in the most critical applications and can be used in a wide range of installations.

5. Mining

Valves for the mining sector are available in a wide variety of high-quality materials such as nickel, aluminium, bronze, Duplex and Super Duplex stainless steel.

6. Desalination plants

Valves for seawater or desalination plants are subjected to extreme conditions. They must withstand chemical attack from chlorine-free ions. For that reason, they require special materials.

7. Pumping Stations

Pumping stations require check valves that allow large amounts of water to pass through when the pumps are in operation and have a sufficiently low pressure drop to allow small amounts of water to pass through by gravity. Reliable check files are required to prevent the backflow of water that has been pumped at a higher elevation in the case of pump stoppage or failure. In view of the fact that the valves would be subject to an immediate static load, a quick action valve is critical. Nevertheless, a valve that closes suddenly may cause other problems by itself.

The most common product families are as follows: gate valves, check valve, Air vent valves, wafer butterfly valves, lug butterfly valves, U section butterfly valves.

wafer butterfly valve.