GGC valves generally refer to gate valves, globe valves, and check valves. They play a vital role in various fields, from industrial production to daily life.
Gate Valves
Gate valves are highly efficient shut-off valves widely used in pipeline systems requiring bidirectional flow. Their core design relies on a wedge-shaped gate that slides vertically to control fluid flow, hence the name “gate valve.” When the valve is fully open, the wedge-shaped gate is completely withdrawn from the flow path, creating a straight, unobstructed flow path for the medium. This design significantly reduces fluid turbulence and pressure loss, resulting in excellent performance in applications requiring stable flow and strict pressure drop control.
It’s important to note that gate valves are primarily used for opening and closing operations and are not suitable for throttling applications. Prolonged operation in a partially open state can lead to localized erosion and wear of the gate and seat, affecting the valve’s sealing performance and service life. Therefore, gate valves are more suitable for scenarios requiring full opening or full closing, rather than frequent flow regulation.
Gate Valve Characteristics
Shutdown Priority: Can only be fully open or fully closed, unsuitable for flow regulation; the gate is susceptible to erosion when partially open, leading to leakage.
Low Flow Resistance: When fully open, the valve plate is completely detached from the flow channel, resulting in minimal fluid resistance and negligible pressure loss.
Bidirectional Flow: Media can pass through from either direction, suitable for ring network pipelines.
Complex Structure: Rising or non-rising stem, wedge or parallel gate design results in larger overall dimensions, higher opening height, and greater installation space requirements.
Easily Abraded Sealing Surfaces: High friction during opening and closing, making maintenance difficult; typically has two sealing surfaces, requiring high-precision machining and grinding.
Wide Application Range: Nominal sizes DN15–DN40 are still available for small diameters; commonly used for pipelines DN≥50.
Gate Valve Application Areas
Oil & Gas: Used as a shut-off valve in high-pressure long-distance pipelines, wellhead installations, and refining plants.
Chemical Industry: Shut-off of corrosive media (stainless steel or fluoropolymer-lined gate valves required).
Power Plants & Boilers: High-temperature, high-pressure steam and feedwater systems.
Water treatment: High-flow-rate water supply and drainage systems (waterworks, municipal pipe networks).
Shipping and marine engineering: Bronze or stainless steel gate valves resistant to seawater corrosion.
Goble Valves
All goble valves operate on the “orifice-closing” principle. A goble valve’s “orifice-closing” design means that fluid passes through a specific opening (unlike the general flow path in a goble valve), and fluid control is achieved within this area via a valve disc mounted on the valve stem or an inserted valve plug.
While goble valves lack the unobstructed straight-through flow path of goble valves, they offer significant advantages in two key areas: regulating performance and suitability for high-frequency use.
Regulating Performance: goble valves excel in regulating performance because they allow fluid to flow evenly around the perimeter of the valve seat, rather than “cutting” the fluid through a narrow area to restrict flow as in goble valves.
Suitability for High-Frequency Use: This design is suitable for frequently operated conditions, offering better durability and reliability.
Goble Valve Features
Simple Structure: Compared to goble valves and other types of valves, goble valves have a simpler structure, making them relatively easier and less expensive to manufacture. The simple structure also facilitates maintenance and repair; when the valve malfunctions, disassembly and replacement of parts are relatively easy.
Short opening and closing stroke: The opening and closing stroke of the valve disc is relatively short. Generally, the flow rate reaches its maximum when the valve disc is opened to 25%-30% of its nominal diameter, indicating that the valve is fully open.
Suitable for regulation and throttling: Because the change in valve seat opening is directly proportional to the valve disc stroke, goble valves are very suitable for flow regulation and throttling operations, meeting the needs of applications with high flow control requirements.
Application areas of goble valves
Chemical and petrochemical industries: Used to control the flow of various corrosive media, oils, liquid metals, etc., to achieve the cutting off, regulation, and throttling of media in the production process.
Power industry: In the steam and water circulation systems of thermal power plants, goble valves are used to control the flow of steam, water, and other media to ensure the normal operation of power generation equipment.
Heating and ventilation systems: In urban centralized heating and building heating systems, goble valves can be used to regulate the flow and pressure of hot water and control indoor temperature.
Hydrogen systems: In hydrogen production, storage, transportation, and utilization, goble valves are used to control the flow direction of hydrogen. Due to the flammable and explosive properties of hydrogen, high requirements are placed on the sealing performance and reliability of shut-off valves.
Cryogenic environments: Such as the liquefied natural gas (LNG) industry, cryogenic flange shut-off valves are used to control the flow and pressure of LNG, ensuring the safe and stable storage, transportation, and regasification processes of LNG.
Check Valves
Although check valves are not valves in the traditional sense, their application is crucial. The main function of a check valve is ‘one-way fluid control,’ allowing fluid to flow in one direction while preventing reverse flow. Check valves are ‘self-actuated,’ specifically designed to prevent fluid from flowing back into the system (i.e., preventing reverse flow).
Check Valve Features
Automatic opening and closing: Driven by the flow of the medium itself or pressure difference, the valve disc requires no external control and only allows unidirectional flow of the medium.
Diverse structures: Common forms include swing, lift, and butterfly types, catering to different flow resistance, sealing performance, and installation direction requirements.
Core anti-backflow function: Prevents backflow of the medium, avoiding pump reversal, system depressurization, or cross-contamination of the medium.
Transient response: “Water hammer” can easily occur during the closing moment, requiring a slow-closing structure, silent design, or a combined solution to reduce the impact.
Wide material range: Valve bodies and internal parts can be made of cast iron, brass, stainless steel, forged steel, etc., suitable for water, steam, oil, corrosive media, and low-temperature conditions.
Check valve applications
Water supply and drainage, municipal engineering: Pump outlets, water supply networks, sewage treatment plants; prevents backflow when pumps stop.
Petrochemical industry: High-pressure or cryogenic pipelines in oil refining, ethylene, and LNG plants; prevents backflow of flammable or toxic media.
Power and energy: Boiler feedwater, steam systems, nuclear power plant secondary circuits; prevents backflow of steam or condensate.
Pharmaceutical and food industries: High-purity or sterile pipelines; utilizes stainless steel + soft-seal structure to prevent cross-contamination.
Firefighting and marine engineering: Fire pump outlets, ship ballast systems; ensures unidirectional flow of media in emergencies.
Newton‘s high-pressure series of gate valves, globe valves, and check valves fully comply with ASME B16.34 standards. All valves feature advanced pressure-sealing designs and incorporate innovative technologies, significantly improving performance and installation safety. Furthermore, these valves are available upon request with ISO and TS certifications to meet the diverse needs of customers worldwide.
