F5 butterfly valve with bypass
This kind of butterfly valve has the unique advantages:
- Keeping the main valve closed and bypass valve open. That can maintain minimum flow across the valve to avoid water stagnancy and maintain water quality.
- Equalize the pressure across the valve to enable manual opening in case of power unavailability.
Available Sizes: DN500 – DN1800
Pressure rating: PN10,PN16,PN25, PN40
All the rubber lined butterfly valves of high reliability, robust design in accordance to the worst prevailing ambient conditions.
Ebonite lining: has good chemical stability, excellent chemical corrosion resistance and organic solvent resistance, low water absorption, high tensile strength and excellent electrical insulation etc.features.
This product is derived from the double eccentric butterfly valve of our company. It also has superior performance and security. Plus the bypass system’s unique advantages, it’s more and more popular with the clients around the world.
It consists of the main valve，the integral bypass pipe and bypass valve.
When closing the valve, close the main valve first and then the bypass valve; When opening the valve, first open the bypass valve, then the main valve. In this way, to balance the differential pressure between upstream and downstream, and the main butterfly valve can be opened and closed easily.
The bodies are constructed of ductile cast iron, with double flange ends in accordance with EN1092-2(other standard drilling be provided as special request)
The flow through disc design is employed to minimize line turbulence and lower head loss. The greater free flow area provides less pressure drop in the full-open position than other disc shapes. The material of ductile iron and stainless steel are available.
The internal and external coating(FBE) in 250μm DFT is corrosion and abrasion resistant, suitable for use for drink water, treated wastewater, raw water etc.
The valves have position indicator and have adjustable end limit stops at both open and closed end position to prevent damage by excessive operating force. They shall close clockwise. For underground valves, the position indicator will be extended above ground.
The gearbox operator is worm wheel type, and has self-locking function. If necessary, the spurgear/bevelgear is equipped with to reduce the required input torque.
All the valves are designed for no leakage under flow from either direction tested at a differential pressure across the seal of rated working pressure. Each valve is subject to a body strength and seat leakage test of separately 1.5 times and 1.1 times the design pressure according to EN12266 before leaving workshop. Test certificate is to be submitted.
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