Easy to operate | Gate valve | Factory direct sales

Easy to operate | Gate valve | Factory direct sales

The types of gate valves can be divided into wedge gate valves and parallel gate valves according to the sealing surface configuration. Wedge gate valves can be further divided into: single gate, double gate and elastic gate; parallel gate valves can be Divided into single gate type and double gate type. Divided according to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve.
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Exquisite craftsmanship

Exquisite craftsmanship

Stick to the spirit of ingenuity CNC precision machining 20 years of technical engineer guidance

Technological innovation

Technological innovation

High-tech foundation Insist on innovation and development Senior technical talent team

Special custom

Special custom

Torque up to 4678nm Senior technical guide selection Special customization according to customer needs

Consistent quality

Consistent quality

ISO9001 international certification Adhere to standardized production processes 1 million cycles durability test

How Gate Valves Work

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.

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DIN JIS 10K ANSI Gost Cast Steel Flange Pneumatic Knife Gate Valve

COVNA HK59-D-D Pneumatic knife gate valve is driven by compressed air. Pneumatic knife gate valve is simply to use pneumatic actuator to control the valve, so as to achieve the opening and closing of the valve. It can be divided into two parts: upper part is pneumatic actuator and lower part is valve. The pneumatic knife gate valve should be installed horizontally in the pipeline. The opening and closing parts of the pneumatic knife gate valve are the gate, the movement direction of the gate is perpendicular to the direction of the fluid, and the manual knife gate valve can only be fully opened and fully closed, and cannot be adjusted and throttled.

DIN JIS 10K ANSI Gost Cast Steel Flange Pneumatic Knife Gate Valve

COVNA WCB Flange Type Wedge Gate Valve

COVNA Flange Wedge gate valve opens by lifting a gate with wedge shape, out of the path of afluid. The sealing surface in between the gate and seats are planar, and once lifted, there are not obstructions in the flow path, so they are used when a minimum friction is required.Widely used in almost all fluid services such as air, fuel gas, feedwater, steam, lube oil, hydrocarbon, and all most any services.

COVNA WCB Flange Type Wedge Gate Valve

Gate valve movement is classified by shell/body material

According to the classification of shell/body material, gate valves can be divided into:
Metal material valves: such as carbon steel valves, alloy steel valves, stainless steel valves, cast iron valves, titanium alloy valves, Monel valves, copper alloy valves, lead alloy valves, etc.
Metal valve body lining valves: such as rubber-lined valves, fluorine-lined valves, lead-lined valves, plastic-lined valves, and enamel-lined valves.
Non-metallic materials valves: such as ceramic valves, glass valves, plastic valves.

Gate valve movement is classified by shell/body material

Gate valve movement mode

The gate valve of the gate valve moves linearly with the valve stem, which is also called a rising stem gate valve. Usually there is a trapezoidal thread on the lifting rod, through the nut on the top of the valve and the guide groove on the valve body, the rotary motion is changed into linear motion, that is, the operating torque is turned into operating thrust. When the valve is opened, when the lift height of the gate is equal to 1:1 times the valve diameter, the fluid passage is completely unblocked, but this position cannot be monitored during operation. In actual use, the apex of the valve stem is used as the mark, that is, the unmovable position, as its fully open position. In order to take into account the temperature change and the lockup phenomenon, it is usually at the top of the opening position, and then rewind 1/2-1 turn, as the position of the fully open valve. Therefore, the fully open position of the valve is determined by the position of the gate (that is, stroke). Some gate valve stem nuts are set on the gate, and the rotation of the handwheel drives the rotation of the valve stem to lift the gate. This kind of valve is called Rotating stem gate valve or dark stem gate valve.

Gate valve movement mode
User Reviews

What users say about COVNA

The workmanship is in place, and the quality is very good at a glance!

Leo

Regular customers, the cooperation has been very happy!

Worlds

The workmanship is fine, the size is right, the design is in place, and the service is attentive and attentive!

Kepler
Frequently Asked Question

Do you have any question?

The fluid resistance is small, and the sealing surface is less brushed and corroded by the medium. It saves effort to open and close. The flow direction of the medium is not restricted, does not disturb the flow, and does not reduce the pressure. The shape is simple, the length of the structure is short, the manufacturing process is good, and the scope of application is wide.

According to the sealing surface configuration, it can be divided into wedge gate valve and parallel gate valve. Wedge gate valve can be divided into: single gate, double gate and elastic gate; parallel gate valve can be divided into single gate Plate type and double gate type. Divided according to the thread position of the valve stem, it can be divided into two types: open stem gate valve and dark stem gate valve

The working principle is different. The shut-off valve has a rising stem type, and the hand wheel rotates and rises along with the stem. For the gate valve, the hand wheel rotates and the valve stem moves upward. The flow rate is different, the gate valve is required to be fully opened, the stop valve is not. The gate valve has no requirements for the import and export direction, and the globe valve has a specified inlet and outlet!

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