Cock’s role

I don’t understand either what a Cawk is

I’m not sure if the author is referring to valves; if so, a cock is the transliteration of \"cock\", and it is a type of plug valve. A plug valve is a valve that uses a plug with holes as its closing element. The plug rotates with the valve stem to carry out the opening and closing action. Small, fillerless plug valves are also known as “cocks”. The plug of a plug valve is usually conical (or cylindrical), and it works together with the conical bore surface of the valve body to form a sealing pair. The plug valve is one of the earliest types of valves to be used; it has a simple structure, enables quick opening and closing, and presents low fluid resistance. Ordinary plug valves rely on direct contact between a precisely machined metal plug and the valve body to achieve sealing, which results in poor sealing performance, high force required to open and close them, and easy wear. They are typically suitable only for low pressures (not exceeding 1 MPa) and small diameters (less than 100 millimeters). To expand the application range of plug valves, many new types of structures have been developed. The oil-lubricated plug valve is the most important type (see figure). A special type of lubricant is injected from the top of the plug into the space between the valve body’s conical hole and the plug, thereby creating an oil film that reduces the torque required to open and close the valve, improves its sealing properties, and extends its service life. Its operating pressure can reach 64 MPa, the maximum operating temperature can reach 325°C, and the maximum diameter can reach 600 millimeters. The channels of plug valves come in various forms. Common straight-through types are mainly used to cut off fluids. Three-way and four-way plug valves are suitable for fluid direction reversal. The closing element of such valves is a perforated cylinder that rotates around an axis perpendicular to the channel, thereby enabling the opening and closing of the channel. Plug valves are primarily used to open and close the flow of media in pipes and equipment. The main advantages of the plug valve are as follows: 1. It is suitable for frequent use, with quick and easy operation. 2. Low fluid resistance. 3. It has a simple structure, relatively small volume, light weight, and is easy to maintain. 4. Good sealing performance. 5. Not restricted by the installation direction; the flow direction of the medium can be arbitrary. 6. No vibration, low noise. Based on their structural design, plug valves can be divided into four types: fixed-type plug valves, self-sealing plug valves, packed plug valves, and lubricated plug valves. Classified by channel type, they can be divided into straight-through, three-way, and four-way types.

Thank you for the advice. In the fertilizer industry, isn’t it a cock that is used at the water seal outlet of the semi-water gas holder?

The valve on our boiler water level gauge is the same.

Agreed, a cock is a type of plug valve.

It’s a plug valve; the plug body is usually conical in shape. It is commonly found in level gauges for atmospheric pressure boilers, as well as as faucets in domestic water heating systems. It seems to be less used in chemical industry systems.

The transliteration of this foreign term is plug valve; ball valves are generally also referred to as cocks

Plug valves are also widely used in the acetic acid industry. They have many applications in environments with corrosive media as well.

A cock is a small plug valve with a simple structure, fast operation, low fluid resistance, and good sealing performance