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Ball Valve Introduction
Blog, Valves Study,

Ball Valve Introduction

1. Ball valve structure The ball valve is evolved from the plug valve. Its opening and closing part acts as a ball, which uses the ball to rotate 90 degrees around the axis of the valve stem to achieve the purpose of opening and closing. COVNA manufactures electric ball valves, pneumatic ball valves, manual ball […]

Oct.15.2020
Butterfly Valve Sealing Principle
Blog, Valves Study,

Butterfly Valve Sealing Principle

The sealing structure of the series of butterfly valves produced are: single eccentric seal, double eccentric seal, triple eccentric seal, variable eccentric seal, and the sealing principles of various structural types of butterfly valves are briefly described as follows: 1. The sealing principle of single eccentric sealing butterfly valve Since the center of rotation of […]

Oct.15.2020
Butterfly Valve Applicable Working Conditions and Mediums
Blog, Valves Study,

Butterfly Valve Applicable Working Conditions and Mediums

There are many types of butterfly valves, including quick cut-off and continuous adjustment, COVNA manufactures pneumatic butterfly valves, electric butterfly valves. Mainly used for liquid and gas low pressure large diameter pipelines. It is suitable for occasions where the pressure loss is not high, flow adjustment is required, and the opening and closing requirements are […]

Oct.14.2020
Valve Gear Transmission Introduction
Blog, Valves Study,

Valve Gear Transmission Introduction

The gear transmission is a mechanical transmission that uses the gear teeth of two gears to mesh with each other to transmit power and motion, and uses the gear teeth of the main and driven wheels to directly transmit motion and power. According to the relative position of the gear axis, it is divided into […]

Oct.14.2020
Valve Drive Mode Features and Selection
Blog, Valves Study,

Valve Drive Mode Features and Selection

——Classification of valve drive mode: According to the movement mode of the drive mechanism, the valve drive device is divided into two types: linear travel and angular travel. According to the driving structure, the valve driving device is divided into: Manual drive: 1. Handle handwheel type (including reduction by intermediate gear) 2. Spring lever Electric […]

Oct.14.2020
Introduction of Valve Hydraulic Device
Blog, Valves Study,

Introduction of Valve Hydraulic Device

The hydraulic device is a driving device that uses hydraulic pressure to open and close or adjust the valve. It is composed of three parts: control, power and executive agencies. The control part is composed of pressure control valve, flow control valve, direction control valve, etc. and electrical control system. The power part is composed […]

Oct.13.2020

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