Products Details

Welded Globe Valve (Welded Globe Valve) introduction
Welding globe valve, also known as globe valve, is a common industrial valve, widely used in petroleum, chemical, electric power, metallurgy, pharmaceutical, food, water treatment, municipal drainage, natural gas, paper, electronic industry, construction, mechanical equipment and other fields.

Working principle
Welded globe valve is a forced seal valve. When the valve is closed, pressure acts on the valve disc, forcing the sealing surface not to leak. When the medium enters the valve from below the valve disc, the operating force needs to overcome the friction of the valve stem and the packing and the thrust generated by the medium pressure. The force to close the valve is greater than the force to open the valve, so the valve stem diameter should be large, otherwise the top bend of the valve stem may fail.

Product characteristics
Compact structure: welded globe valve and pipeline adopt welded structure, sealing surface is not easy to wear, good sealing performance, long service life.
Easy to operate: simple structure, easy to manufacture and maintain, short working stroke, short switching time.
High temperature and high pressure resistance: suitable for water and oil control, with high temperature and high pressure resistance.
Product application
Welding stop valves are suitable for the control of a variety of media, including but not limited to water, oil, natural gas, etc. Its sealing properties and durability make it ideal for use in industrial systems.

Valve type
Welding globe valves can be divided into the following types according to different design and application requirements:

Standard (T-type) : With the lowest flow coefficient and high pressure drop, suitable for heavy throttling services.
Type Y: can be slightly opened for a long time without serious corrosion, provides very low flow resistance, and is widely used in starting operations.
Angle type: The fluid flow direction is vertical, without the use of elbows, suitable for pulsating flow services.
Valve component
A typical welded globe valve consists of the following components:

Valve body: spherical structure.
Valve cover.
Valve disc or plug.
The valve stem.
The fork rack.
Packing gland and flange.
Valve seat ring.
Fork rack cover.
Packing bolts and nuts.
Handwheel: mechanical actuator.
Valve seal
Welded globe valves can be equipped with metal seats or soft seats. A variety of seat configurations are designed to maintain uniform seat stress.

Valve function
The main function of the welding stop valve is to start, stop or regulate the flow of fluid. When the valve disc is moved upward, the fluid can flow proportionally. In the full open position, the stem rises and pops out from the top.

Valve symbol
In the pipeline industry, the symbol for welded globe valves is very popular and is often used in P&ID to distinguish other types of valves.

advantage
Good sealing ability.
Moderate to good throttling capacity.
The trip is short.
Offers a variety of capabilities, such as T, Y, and horn body styles.
Easy machining and regrinding of valve seats.
By slightly modifying the design, the globe valve can be used as a check valve.
shortcoming
High pressure drop due to multiple directional changes.
Greater force or power is needed to close the valve.
The throttling flow is under the seat and the closing flow is on the seat.
Application field
Welded globe valves can be used in a wide range of services, including low and high pressure fluid services. Typical applications include:

Cooling water systems requiring flow regulation.
A fuel system that requires tightness.
Control valve bypass system.
High ventilation and low drainage.
Oil and gas, water supply, chemical feed, refinery, condenser air extraction and extraction drainage systems.
Boiler ventilation and drainage, steam service, main steam ventilation and drainage, heater drainage.
Turbine sealing and drainage.