Stick to the spirit of ingenuity CNC precision machining 20 years of technical engineer guidance
High-tech foundation Insist on innovation and development Senior technical talent team
Torque up to 4678nm Senior technical guide selection Special customization according to customer needs
ISO9001 international certification Adhere to standardized production processes 1 million cycles durability test
COVNA Industrial Automation Co., Ltd. was established in 2000, an automated valve specialist. Headquartered in Dongguan China, with 3 production bases located in Ningbo, Wenzhou and Dongguan.
We Provide Electric Valve，Solenoid Valve，Pneumatic Valve，Electric Gate Valve，Electric Butterfly Valve，Pneumatic Control Valve，Motorized Valve，Pneumatic Knife Gate Valve，Control Valve Pneumatic，Pneumatic Actuated Valve，Motorized Operated Valve，Electric Ball Valve，Electric Actuated Ball Valve，Ball Valve，Gate Valve，Gate Valve，Butterfly Valve，Globe Valve，etc, You can browse related products and initiate consultations on our website.
①The valve adopts pressure self-tightening seal or valve body and bonnet gasket seal structure, which is trustworthy! It is safe and reliable to use.
②The valve disc adopts a double gate with a universal top structure in the middle, which can automatically adjust the fit between the valve disc and the sealing surface of the valve seat to ensure the sealing of the valve. At the same time, this structure is convenient for maintenance, saves costs, and has better valve interchangeability.
③The sealing surface of valve disc and valve seat is made of cobalt-chromium-tungsten cemented carbide by plasma spray welding. The sealing surface has high hardness, abrasion resistance, abrasion resistance and long service life.
④The valve stem is made of nitrided steel with surface nitriding treatment, high hardness, scratch resistance, corrosion resistance and long service life.
⑤The electric device is equipped with a torque control mechanism, an on-site operating mechanism, and a hand and electric switching mechanism. In addition to local operations, remote operations can also be performed.
for fully open and fully close. With features of high flow rates and remote control. Widely used for paper and pulp, power plant, chemical industry, iron industry and so on. Gate valve available in ANSI, JIS, DIN, GB standard. Electric knife gate valve also available for your project!
As an electric actuator valve manufacturer, we manufacture ball valves, butterfly valves, gate valves, globe valves with electric actuators for you.
1. The structure is compact, the design is reasonable, the valve rigidity is good, the passage is smooth, and the flow resistance coefficient is small.
2. The sealing surface is made of stainless steel and hard alloy, which has a long service life.
3. Using flexible graphite packing plate, reliable sealing, light and flexible operation.
4. The driving mode is divided into manual, electric, pneumatic, gear transmission, and structural forms; elastic wedge single valve, rigid wedge single valve plate and double gate plate type.
5. It is widely used as the opening and closing device for connecting or cutting off the medium in the pipelines of petroleum, chemical, thermal power plants and other oil, water and steam pipelines.
6. It saves effort to open and close the gate valve.
7. The flow direction of the gate valve medium is not restricted, does not disturb the flow, and does not reduce the pressure
The workmanship is in place, and the quality is very good at a glance!
Regular customers, the cooperation has been very happy!
The workmanship is fine, the size is right, the design is in place, and the service is attentive and attentive!
The purpose and use of both gate and butterfly valves are same. The difference between the both valves lies in shape, size and operation. Butterfly valves are lighter than gate valves, so for the big sizes it is convenient to install and operate butterfly valve because it is lighter and compact in compare to gate valves.
Gate valves either allow or bar the passage of hydraulic fluid, and globe valves adjust the flow of hydraulic fluid between fully on and fully off. Gate valves are plate-like, and globe valves are circular.
The structure classification of electric gate valve: gate valve is generally composed of valve stem, valve body, bonnet, gate plate, driving device and other parts (fasteners, stem nut, sealing packing). The structure is introduced one by one below: Gate valve stem press The movement form is divided into the open rod (lifting shaft) and the dark rod (rotating shaft). Therefore, the gate valve is divided into two types: the open rod gate valve and the dark rod gate valve.