Electric Flanged Plastic Butterfly Valve

• Media: Water Vapor Oils
• Driving Mode: Electromanual Pneumatic
• Connection Form: Flange Welding
• Structure: Three-Eccentric Sealing
• Seal Form: Supercharging Pressured Sealed
• Valve Stem: Normal
• Model NO.: Plastic butterfly valve
• Work Pressure: Mid-Pressure (2.5mpa< Pn <6.4mpa)
• Working Temperature: Medium Temperature (120°C<T<450°C)
• Material of Seal Surface: Metal Hard Sealed
• Valve Body: Sheet Metal
• Standard: National Standard
• Application: Industrial Usage, Water Industrial Usage, Household Usage
• Transport Package: Wooden Box
• Specification: DN50-DN2400
• Trademark: xc
• Origin: China
• HS Code: 8481804090
• Production Capacity: 10000

Product Description

Product introduction

Electric plastic butterfly valve also known as PVC electric butterfly valve) using an integrated electric actuator in the plastic butterfly valve composition. Input 220V power supply can be directly adjusted switching quantity, can also be built-in servo module, input control signal (4 ~ 20mADC or 1 ~ 5VDC) and single-phase power supply can control operation. Electric plastic butterfly valve (PVC electric butterfly valve) light weight, strong corrosion resistance, is used in many fields, such as general pure water and raw drinking water piping system, drainage and sewage piping system, salt water and seawater piping system, acid base and chemical solution system and other industries, the quality has been recognized by the majority of users. Electric plastic butterfly valve (PVC electric butterfly valve)

Uses

Plastic butterfly valve with spherical sealing surface lining polytetrafluoroethylene butterfly plate, the valve operation light, tight sealing performance, long service life; It can be used for quickly cutting off or regulating the flow. Suitable for applications requiring reliable sealing and good regulating characteristics. The valve body adopts split type, and the sealing at both ends of the valve shaft is controlled by the rotating base fluorinated rubber between the butterfly plate and the seat; Ensure that the valve shaft is not in contact with the fluid medium in the chamber. It is widely used in the transportation of liquids and gases (including vapors) in various types of industrial pipelines, and the use of severely corrosive media, such as: sulfuric acid, hydrofluoric- acid, phosphoric acid, chlorine gas, strong alkali, aqua regia and other highly corrosive media.

Product performance

Plastic butterfly valve is used in many fields, the product performance of electric plastic butterfly valve is summarized as follows:
1. The valve body of the plastic butterfly valve needs only the minimum installation space, and the working principle is simple and reliable;
2, approximate percentage of flow characteristics, can be used for regulation or switching control;
3, the valve body of the plastic butterfly valve with the standard convex pipe flange;
4, the superior economic performance makes the butterfly valve the most widely used industry;
5, the plastic butterfly valve has a great flow capacity, and the pressure loss through the valve is minimal;
6, the plastic butterfly valve body has a very significant economy, especially the larger caliber butterfly valve;
7, plastic butterfly valve is especially suitable for the medium of cleaner liquids and gases.

Features

1. Compact and beautiful appearance.
2. Light weight and easy installation.
3, strong corrosion resistance, wide application range.
4, the material is healthy and non-toxic.
5, wear resistance, easy to disassemble, easy to maintain.

Technical parameters

Body form: straight through body
Nominal diameter :DN50 ~ 300mm
Nominal pressure :PN1.0, 1.6MPa
Connection form: flange type \ clamp type
Sealing material :FPM, EPDM, NBR
Applicable temperature :0 ~ +60ºC
Body material :UPVC, CPVC, PP
Spool material :UPVC, CPVC, PP, PTFE
Applicable medium: PVC-compatible chemical solvent for food industry
Valve internals
Valve plate form: butterfly (vertical plate)
Flow characteristics: linear
Executive mechanism
Actuator type number :CHR, 381R, HQ
Main technical parameters: Power voltage: 220V/50Hz, 380V/50Hz, input signal: 4-20mA or 1-5V·DC, output signal: 4-20mA·DC
Protection level: IP67, flameproof mark: ExdBT4, hand operation function: handle, hand wheel
Ambient temperature: -25 ~ +70ºC, ambient humidity: ≤95%

Connection method

The plastic butterfly valve is connected to the pipeline system in the following ways
Butt welding connection: the outer diameter of the valve connection part is equal to the outer diameter of the pipe, and the end face of the valve connection part is welded relative to the end face of the pipe;
Socket bonding connection: the valve connection part is in the form of a socket, and the pipe is bonded;
Electric fusion socket connection: the valve connection part is the socket form of the electric heating wire laid in the inner diameter, and the pipe is connected by electric fusion;
Hot melt socket connection: the valve connection part is in the form of a socket, and the pipe is connected by hot melt socket;
Socket bonded connection: the valve connection part is in the form of socket, and the pipe is bonded socket connection;
Socket rubber sealing ring connection: the valve connection part is the socket form of the inner rubber sealing ring, and the pipe is connected by socket;
Flange connection: the connecting part of the valve is in the form of a flange, which is connected with the flange on the pipe;
Thread connection: the valve connection part is in the form of thread, which is connected with the thread on the pipe or pipe fitting;
Live connection: the valve connection part is in the form of live connection, which is connected with the pipe or pipe fitting.
A valve can have different connections at the same time.

Popularization of Knowledge

Plastic butterfly valve is a kind of valve that uses a circular butterfly plate as a opening and closing part and rotates with the valve stem to open, close and adjust the fluid channel. The butterfly valve plate is installed in the diameter direction of the pipeline. In the cylindrical channel of the butterfly valve body, the disc disc rotates around the axis, the rotation Angle is between 0°~90°, and the valve is fully open when it is rotated to 90°.

Working principle

The relationship between the opening of the plastic butterfly valve and the flow rate is basically linear proportional change. If it is used to control the flow, its flow characteristics are also closely related to the flow resistance of the pipe, such as the two pipe installation valve caliber, form, etc. are the same, and the pipeline loss coefficient is different, the flow of the valve will be very different.
If the valve is in a larger state of throttling, the back of the valve plate is prone to cavitation, and there is the possibility of damage to the valve, which is generally used outside 15°.
When the plastic butterfly valve is in the middle opening, the opening shape formed by the valve body and the front end of the butterfly plate is centered on the valve shaft, the two sides form different states, the front end of the butterfly plate on one side moves in the direction of the flow water, the other side moves in the direction of the countercurrent water, therefore, the valve body and the valve plate form a nozzle-shaped opening, the other side is similar to the throttle hole opening, the nozzle side is much faster than the throttle side. And the throttle side of the valve will produce negative pressure, often appear rubber seals fall off.
The plastic butterfly valve and the butterfly rod itself have no self-locking ability. In order to position the butterfly plate, the worm gear reducer should be installed on the valve rod. The use of worm gear reducer can not only make the butterfly plate with self-locking ability, so that the butterfly plate stops in any position, but also improve the operating performance of the valve.
Plastic butterfly valve operating torque, because of the opening and valve opening and closing direction of different values, horizontal butterfly valve, especially large caliber valve, due to the water depth, valve shaft, the moment generated by the head difference can not be ignored. In addition, when the valve inlet side is equipped with a bend, the bias is formed, and the torque will be increased. When the valve is in the middle opening, the operating mechanism needs to self-lock due to the action of the water flow torque.
The structure of the plastic butterfly valve is simple, composed of only a few parts, and the material consumption is less; Small size, light weight, small installation size, small driving torque, simple and rapid operation, only need to rotate 90° to quickly open and close; And also has a good flow regulation function and close sealing characteristics, in the large and medium diameter, medium and low pressure in the field of use, butterfly valve is the dominant valve form. When the butterfly valve is in the fully open position, the thickness of the butterfly plate is the only resistance when the medium flows through the valve body, so the pressure drop generated by the valve is small, so it has better flow control characteristics. The butterfly valve has two types of seal: elastic seal and metal seal. Elastic sealing valve, the sealing ring can be inlaid on the valve body or attached to the butterfly plate around. Valves with metal seals generally have a longer life than those with elastic seals, but it is difficult to achieve complete sealing. Metal seals can adapt to higher operating temperatures, and elastic seals have temperature-limited defects. If the butterfly valve is required to be used as a flow control, the main thing is to correctly select the size and type of valve. The structure principle of butterfly valve is especially suitable for the production of large diameter valves. Butterfly valve is not only widely used in petroleum, gas, chemical industry, water treatment and other general industry, but also used in the cooling water system of thermal power station. Commonly used butterfly valves are clamping butterfly valves and flanged butterfly valves. connectedClamping butterfly valve is connected between the two pipe flanges with a double-headed bolt, flanged butterfly valve is a valve with a flange, and the two ends of the valve are  to the pipe flange with a bolt. The strength performance of the valve refers to the ability of the valve to withstand the pressure of the medium. The valve is a mechanical product that bears internal pressure, so it must have enough strength and stiffness to ensure long-term use without rupture or deformation.
With the application of anti-corrosion synthetic rubber and polytetrafluoroethylene, the performance of butterfly valve can be improved, and meet different working conditions. In recent ten years, the metal seal butterfly valve has developed rapidly, with the application of high temperature resistance, low temperature resistance, strong corrosion resistance, strong erosion resistance, high strength alloy materials in the butterfly valve, so that the metal seal butterfly valve has been widely used in high temperature, low temperature, strong erosion and other working conditions, and partially replaced the globe valve, gate valve and ball valve.

Structural features

Butterfly valve has the characteristics of simple structure, small size, light weight, material consumption, small installation size, quick switching, 90° reciprocating rotation, small driving torque, etc., for cutting, connecting, adjusting the medium in the pipeline, with good fluid control characteristics and closing sealing performance.
The plastic butterfly valve can transport mud and accumulate the least liquid in the pipe opening. At low pressure, a good seal can be achieved. Good adjustment performance.
The streamlined design of the butterfly plate makes the fluid resistance loss small, which can be described as an energy-saving product.
The valve stem is a through rod structure, after tempering treatment, has good comprehensive mechanical properties and corrosion resistance, abrasion resistance. When the butterfly valve is opened and closed, the valve stem only rotates without lifting and lifting operation, and the packing of the valve stem is not easy to damage and the seal is reliable. It is fixed with the taper pin of the butterfly plate, and the protruding end is designed to prevent the valve stem from breaking out when the connection between the valve stem and the butterfly plate is accidentally broken.
The connection modes are flange connection, clamp connection, butt welding connection and lug clamp connection.
The driving forms are manual, worm gear transmission, electric, pneumatic, hydraulic, electro-hydraulic linkage and other actuators, which can realize remote control and automatic operation. The disadvantages of butterfly valve are as follows:
1, the use of pressure and working temperature range is small.
2, poor sealing.