Established in 2008 with a registered capital of RMB 5 million, GNEE Group is a leading international supplier specialising in the manufacture and distribution of high quality valves and fittings for a wide range of industrial applications including water supply, sewage systems, oil and gas, and marine treatment.
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Our Products
GNEE Group specializing in the manufacture and distribution of high quality valves and fittings for a wide range of industrial applications including water supply, sewage systems, oil and gas, and marine treatment.
Sales Market
GNEE valves have been exported to more than 160 countries around the world, and every year more than 50 customers visit the GNEE Group and order more than 30,000 pieces of valves.
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Established in 2008 with a registered capital of RMB 5 million, GNEE Group At present, the company has a total investment of 30 million yuan, a plant area of more than 35,000 square meters and more than 200 employees.
Customer Service
GNEE Group always puts product quality and customer needs first, and strives to provide better services to each of our customers. We follow the latest standards and focus on management, technology and process innovation. With a mature sales service system, GNEE Group insists on providing one-stop service to every customer.
While these valves all do essentially the same function, there are variations of butterfly valve design to suit different operations. Below are the three main butterfly valve types.
Zero-offset Butterfly Valve
“Concentric” or “rubber seated” are other names for the zero-offset design. Zero-offset means there is no offset by the stem of the valve. The valve seals via interference along the disc edge at the stem between the disc and the rubber seat.
The rubber seated valve has the lowest pressure rating (up to 250 PSI) and withstands heat up to 400°F. Its rubber seat encases the body to prevent contact with the material which maintains the purity of the media.
High-Performance Double Offset Butterfly Valve
This butterfly valve is referred to as a double offset because the offset is in two places: at the line of the disc seat /body seal, and at the bore. Off-center positioning increases durability for the seal. High-performance valves tolerate pressure up to 1440 PSI and temps up to 1200°F.
A cam-action occurs from the stem being behind the disc as it rubs against the during rotation at 90° for the first 10 degrees of opening, but also for the 10 degrees of closing.
Triple Offset Butterfly Valve
The best type of butterfly valve for high-pressure systems is the triple offset butterfly valve. Of the three types, the triple offset is the most advanced with lower emissions and is designed to work with various environments. Its heat tolerance is 1200°F as it can withstand 1,480 PSI of pressure.
Like the double offset valve, the triple offset valve consists of two offsets situated in the center, but with a third offset having cam action with right-angled conical sealing. It is frictionless and long-wearing by the metal seal components not making contact until their final point.
Industries Utilizing Butterfly Valves
Butterfly valves find application across a wide array of industries, including:
Water & Wastewater Treatment
Ideal for controlling flow in water distribution and treatment systems due to their low maintenance and tight shut-off.
Power Generation
Used in various applications within power plants, including cooling water systems and flue gas desulfurization processes.
Oil & Gas
Popular for regulating flow in pipelines due to their lightweight design and quick operation.
Chemical Processing
Employed in various chemical processes due to their resistance to corrosive chemicals and ability to handle slurries.
Food & Beverage
Widely used in food and beverage production due to their sanitary design, high durability, and ease of cleaning.
HVAC & Building Automation
Manage airflow in heating, ventilation, and air conditioning systems due to their compact size and quick response.
Butterfly Valve components
The butterfly valve consists of only four main components: Body, disk, stem and seat.
Butterfly valve body
Butterfly valves generally have bodies that fit between two pipe flanges, the most common being lug and wafer body design.
Butterfly valve disk
The disk is how the valve stops flow – It is equivalent to a plug in a plug valve, a gate in a gate valve or a ball in a ball valve. There are variations in disk design and orientation in order to improve flow, sealing and/or operating torque.
Butterfly valve Stem
The stem of the butterfly valve may be a one-piece shaft or a two-piece (split-stem) design. The stem in most resilient seated designs is protected from the media, thus allowing an efficient selection of material with respect to cost and mechanical properties.
Butterfly valve Seat
The seat of a resilient-seat butterfly valve utilises an interference fit between the disk edge and the seat to provide shutoff. The material of the seat can be made from many different elastomers or polymers. The seat may be bonded to the body or it may be pressed or locked in.
Butterfly valve specifications
Butterfly valves are available in various sizes, materials, and designs to suit different applications. Some common specifications include:
Size
2″ to 72″
Pressure Rating
Class 150 to 1500
Temperature Rating
-50°C to +650°C
Body Material
Cast iron, ductile iron, carbon steel, stainless steel, etc.
Disc Material
Stainless steel, aluminium bronze, duplex steel, etc.
Seat Material
EPDM, Buna-N, Viton, PTFE, etc.
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FAQ
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