Lug Type Soft Seated Butterfly Valve with Gearbox
A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required. The disc is positioned in the center of the pipe, passing through the disc is a rod connected to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve position.
A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.
There are different kinds of butterfly valves, each adapted for different pressures and different usage. The zero offset butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating. The high performance double offset butterfly valve, used in slightly higher-pressure systems, is offset from the centre line of the disc seat and body seal (offset one), and the centre line of the bore (offset two). This creates a cam action during operation to lift the seat out of the seal resulting in less friction than is created in the zero offset design and decreases its tendency to wear. The valve best suited for high-pressure systems is the triple offset butterfly valve. In this valve the disc seat contact axis is offset, which acts to virtually eliminate sliding contact between disc and seat. In the case of triple offset valves the seat is made of metal so that it can be machined such as to achieve a bubble tight shut-off when in contact with the disc.
Lug-style valves have threaded inserts at both sides of the valve body. This allows them to be installed into a system using two sets of bolts and no nuts. The valve is installed between two flanges using a separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without disturbing the other side.
A lug-style butterfly valve used in dead end service generally has a reduced pressure rating. For example a lug-style butterfly valve mounted between two flanges has a 150 psi pressure rating. The same valve mounted with one flange, in dead end service, has a 75 psi rating.
Technical Specifications
| Nomidal Diameter | DN(mm) | 50~2000 |
| Nominal Pressure | PN(Mpa) | 0.6 | 1 | 1.6 |
| Test Pressure | Shell Test | 0.9 | 1.5 | 2.4 |
| Sealing Test | 0.66 | 1.1 | 1.76 |
| Air Test | 0.6 | 0.6 | 1.76 |
| Suitable Medium | Air, water, sewage, steam, gas, oil, etc |
| Actuator | Handle, gear, electric actuator, pneumatic actuator |
Main Parts & Materials
| Part Name | Part Name |
| Body | Cast iron, ductile iron, cast steel, stainless steel, rubber-lined, PTFE-lined, etc |
| Disc | Cast iron, ductile iron, cast steel, stainless steel, special materials |
| Seat Ring | Ductile iron, cast steel, stainless steel, alloy steel |
| Stem | 45#, 2Gr13, stainless steel |
| Packing | O-Ring, soft graphite |
Company Overview
Zhejiang Wenbao Valve Technology Co.,Ltd was established in 1985. The main products range are as following: Fully Welded Ball Valve,1PC/2PC/3PC Flanged Ball Valve, Threaded Ball Valve, Mini Ball Valve, High Pressure Ball Valve, Pneumatic Ball Valve, Electric Ball Valve, Sanitary ball valve, Ball valve with mounting pad and other valves like gate, globe, check valves and Strainer, etc. Main material include: Stainless steel, Cast Steel, Forged Steel and Brass, etc. The products manufactured as per API, ANSI, JIS, ISO, BS, JB and GB, and have CAD valve design and quality testing center. The products are widely used in chemical industry, oil, metallurgy, light industry, electric power, food, pharmacy, civil industry, fiber industry, liquefied natural gas, liquefied petroleum gas, steel mills, heating pipes, etc. Our company passed the ISO 9001:2008, Standards Organization of Nigeria(SON), International Quality Award Certificate, Manufacture License of Special Equipment, KC of South Korea,CE of Europe, etc.
Zhejiang Wanbao Valve Technology Co., Ltd is located in Wenzhou city - the valve centre of China and covers an area of 6000 square meters. The company is specialized in the development, production and sales of pipe fittings and has the most advanced processing equipment, modern testing technologies, various CNC machines and other advanced machines.
Since its establishment in 1985, the company constantly develops new products based on scientific and technological innovation. The production is carried out as per different international standards: API, ANSI, JIS, ISO, BS, GOST, also by national standards JB and GB. The company created Computer-aided engineering and design (CAD) center, UG three-dimensional design center and testing center. Using the powerful production equipments and perfect testing methods, the company is able to effectively improve the product quality, thus ensuring the interests of customers.
Our main products are as follow: Various types of ball valves (1-PC, 2-PC, 3-PC ball valves, sanitary ball valve, fully welded ball valve), globe valves, check valves, gate valves, butterfly valves, strainers, fire hydrants, pipe fittings, etc. Our products are widely used in chemical, petroleum, metallurgy, electric power, food, pharmaceutical, fibrous, civil, light industry, etc.
By now the company has powerful technical forces and more than 120 employees, including 16 senior engineers and technical personnel. The registered capital of the company is 10.18 million and 1 million RMB. The company is a member of the Association of valves of Longwan district. The company has established a perfect sales network. Products are exported to Europe, America, Middle East, Southeast Asia, Africa, Korea, Russia, etc., for the installation in industrial pipelines of hydro-power station. We received a positive evaluation of our products and by now there is no quality complaints from customers.
Adhering to the business philosophy "survival by quality, development by reputation", the company is committed to "create the image of Wanbao all efforts and create the brand Wenbao with all our heart". The company has repeatedly been rated as the enterprise, which "values the contract and keeps reputation. "
After passing various kinds of certification, the company has improved testing methods and testing equipments. The company has all kinds of equipments for physical and chemical testing, such as spectrum quantitative analyzer, roundness measurement instrument (made in Japan), HLN-11A Leeb hardness tester, torque wrench, HR-150A Rockwell hardness tester, XXQ-2505 inflatable X-ray converter defectoscope, MT150 ultrasonic thickness gauge, WEW-300B universal hydraulic testing machine, testing fatigue testing machine, etc.
Wenbao company warmly welcomes new and old customers to cooperate and create our brilliant future!
