API 600 Gate Valves
API 600 is a design and manufacturing standard for steel gate valves developed by the American Petroleum Institute (API). First published in 1949, it has been updated to its 13th edition. The core positioning of API 600 gate valves is: full-bore valves specifically designed for critical locations in industrial pipelines such as oil, aardgas, chemicals, and power plants. They are primarily used to cut off or connect the medium in pipelines, and are particularly suitable for extreme conditions such as high temperature and high pressure.
Gate valves are typically used when a straight-line flow of fluid and minimum flow restriction are needed. They are well suited for high pressure and high temperatures, and can be used for a wide variety of fluid. Because the gate valve is symmetrical, either end can be the inlet, allowing flow to enter through either direction of the valve, otherwise known as bidirectional.
Advantages and Features of API 600 Gate Valves:
Low fluid resistance and strong flow capacity: When fully open, the fluid passage is straight, resulting in extremely low flow resistance and minimal energy loss.
Two-way sealing for zero leakage: The valve body employs a wedge design, relying on a dual mechanism of self-sealing by medium pressure and external forced sealing to ensure a tight seal when closed.
Reliable structure and resistance to extreme conditions: Strictly adhering to the API 600 standard, stringent requirements are placed on key components such as valve body wall thickness, stem diameter, and sealing performance.
Rising stem and intuitive status: API 600 explicitly mandates an rising stem and lifting structure (OS&Y). Operators can clearly determine the valve’s open or closed state by observing the stem’s position, preventing misoperation.
Fire safety design: The API 600 standard clearly stipulates the safety requirements of valves in extreme conditions such as fires, ensuring the valve’s fire safety.
Flexible material selection and strong adaptability: A variety of valve body materials can be selected according to different media, including carbon steel (WCB), roestvrij staal (CF8/CF8M), duplex stainless steel (2205), Hastelloy, enz. Standards have strict requirements for the low-temperature toughness and corrosion resistance of materials under extreme operating conditions.
Easy maintenance and convenient operation: The reverse seal design allows for the replacement and maintenance of vulnerable parts such as packing and gaskets without stopping the system.
There are many designs for the Gate valve, including rising and non-rising stem, knife, slab, and expanding.
Application
Cast gate valves provide optimum performance in conditions where high flow efficiency, tight shut off and long service is required. A wide choice of shell and trim materials do cover the whole range of applications, from the every-day type of non-corrosive service to critical service with highly aggressive media.
Constructive and functional characteristics
type: bolted bonnet, outside screw and yoke
flexible wedge
rising stem with top sealing (backseat)
full bore
flanged ends
shutting-off: by rotating the handwheel in clockwise direction
mounting position: any
Execution
basic design according to API 600
face to face according to ANSI B16.10
flanges according to ANSI B16.5
flange facings: 0,06″ raised face;
druk – temperature ratings according to ASME B16.34
shell wall thickness according to API 600
testing according to API 598
trim standard: no. 1 main sealing 13% Cr / 13% Cr.
The target market for API 600 gate valves is primarily focused on the following areas:
Toepassingsgebieden | Typical Scenarios/Pressure Ratings | Market Drivers
Oil Refining & Petrochemicaliën (Core Market) | Class 300-600 | Continuous expansion of global refining capacity, with new and retrofit projects driving strong demand for high-quality valves.
Natural Gas Transmission & Pipeline Systems | Class 600-900 | The vast global natural gas pipeline network creates a strong demand for tightly sealed shut-off valves that ensure safety and environmental protection.
Chemical Processes & Specialty Chemicals | Class 150-300 | The chemical industry handles corrosive media, acid and alkali solutions, requiring valves with extremely high corrosion resistance.
Thermal Power Generation & Boiler Steam | Class 300-1500 | High-temperature, high-pressure steam and boiler feedwater systems in power plants are important application scenarios for gate valves.
Offshore Platforms & Shipbuilding | Class 300-600 | Includes stringent requirements such as flange strength and valve impact resistance.
On request
other basic design according to API 6D
other shell materials (Koolstofstaal, Stainless steel, Monel, Duplex, Inconel)
other trim
other flange facings according to ANSI B 16.5 or B/W ends to ANSI B16.25
other type gasket body – bonnet
lantern ring for class 300
drain tappings
by-pass
open and shut indicator
electric actuator operation
manufactured according to specification NACE MR 0175 for hydrogen sulphide and sour gas service
