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American Standard Gate Valves

1. What is American Standard Gate Valves ?

The product is designed and manufactured in accordance with the American National Standard ANSI B16.34, the American Petroleum Institute standards API 6D, and API 600 requirements. The product has a compact and rigid structure with excellent sealing performance, making it one of the most widely used and common valves in pipeline systems.

American Standard Gate Valves
Source:WVF

2. Main componentsof American Standard Gate Valves

1)Gate: The core component of a gate valve used to control the flow of the medium. The gate is usually made of high-quality stainless steel material, providing good corrosion resistance and wear resistance.

2)Valve body: It bears the gate and other components, serving as the main structural body of the valve. The valve body of gate valves is typically made of materials such as cast iron, carbon steel, or stainless steel, possessing high strength and pressure resistance.

3)Valve seat: Located inside the valve body, it seals against the gate to prevent medium leakage. The valve seat of gate valves usually employs elastic materials such as rubber or polytetrafluoroethylene (PTFE) to ensure good sealing performance.

4)Valve stem: It connects the gate to the handle or actuator, used to control the opening and closing of the gate. Valve stems are typically made of stainless steel material, offering good corrosion resistance and mechanical properties.

5)Actuator: Gate valves can be operated through various methods, including manual operation, electric operation, and pneumatic operation. Manual operation is suitable for small valves, while electric and pneumatic operations are suitable for large valves and automation control systems.

Main components of American Standard Gate Valves
source:velan

3. Characteristics of American Standard Gate Valves

1)The product is designed and manufactured in accordance with the American National Standard ANSI B16.34, the American Petroleum Institute standards API 6D, and API 600 requirements.

2)Compact structure, small size, good rigidity, and reliable sealing.

3)The closure element (gate) adopts an elastic structure, which can automatically compensate for valve body deformation caused by abnormal loads or temperatures during operation. Therefore, the sealing is reliable and does not produce gate wedging.

4)For manually operated valves with nominal diameters greater than or equal to NPS10″ and pressure ratings of 400 pounds and nominal diameters greater than or equal to NPS6″ and pressure ratings of 600 to 2500 pounds, the operating devices are equipped with rolling bearings for easy opening and closing.

5)The materials of the main body, internal parts, packing, gaskets, and fasteners can be reasonably combined according to user requirements or actual working conditions.

6) The seat can be replaceable, allowing for the pairing of sealing surface materials with the closure element to meet operational requirements and extend service life.

Forged Steel A105N 1” 800LB Butt Weld Gate Valve
Forged Steel A105N 1” 800LB Butt Weld Gate Valve

4. Structural Design

1) Valve body and bonnet connection form: Class 150~Class 900 adopts bolted bonnet; Class 1500~Class 2500 adopts pressure seal bonnet.

2)Spring-loaded packing gland system: If required by the customer, a spring-loaded packing gland system can be adopted to improve the durability and reliability of the packing seal.

3)Bonnet gasket form: Class 150 gate valves adopt stainless steel graphite composite gaskets; Class 300 intermediate valves adopt stainless steel graphite winding gaskets; Class 600 gate valves can use stainless steel graphite winding gaskets or metal ring gaskets; Class 900 gate valves can use metal ring gaskets; Class 1500~Class 2500 gate valves adopt self-sealing metal ring gaskets.

4)Packing seal: Flexible graphite is commonly used as packing material and can be provided with PTFE or composite packing materials according to user requirements. The surface roughness of the contact surface between the packing and the stem is 0.2μm, ensuring tight but smooth rotation of the stem. The roughness of the stem sealing surface machined with precision machining is 0.8μm, ensuring reliable stem sealing.

5)Operating mode: Generally, handwheel or gear drive is adopted, and chain drive or electric drive can be used according to user needs.

6)Gate design: Elastic gate for NPS≥2 and rigid gate for NPS<2″.

7)Back-sealing design: All gate valves provided by our company have a back-sealing design. Generally, the seat design of carbon steel gate valves adopts a separable back-sealing structure, while the back-sealing of stainless steel gate valves is processed directly or after welding. When the valve is in the fully open position, the back-sealing is very reliable. Although there is a back-sealing according to the API 600 standard, this is not the basis for replacing packing under pressure.

8)Stem design: Made by integral forging process, the minimum diameter is determined according to standard requirements. The stem and valve disc are connected in a T-shaped structure. The strength of the stem joint surface is greater than that of the stem T-shaped thread part. The strength test is conducted according to API 591.

9)Stem nut: Generally, the stem nut material is ASTM A439 D2. Copper alloys and other materials can be used according to user requirements. For large-diameter gate valves (NPS≥10″ Class 150; NPS≥8″ Class 300; NPS≥6″ Class 600; NPS≥5″ Class 900), there are rolling bearings between the stem nut and the stem, which can effectively reduce the opening torque of the gate valve and make it easy to open and close.

Cast Steel WCB DN150 PN10 RF Flange Gate Valve With Handwheel
Cast Steel WCB DN150 PN10 RF Flange Gate Valve With Handwheel

5. Advantages and Disadvantages of American Standard Gate Valves

-Advantages:

1)Fluid Resistance: Gate valves offer very minimal fluid resistance. The minimal fluid resistance is attributed to the straight-through media channel inside the valve body, allowing the medium to flow directly through the valve without changing direction. Therefore, the flow path is unobstructed.

2)Energy Efficiency: Because the movement direction or valve stem is perpendicular to the flow direction of the medium. Therefore, less power is consumed when opening or closing gate valves.

3)Simple Structure: Gate valves are composed of a relatively simple structure, making them easy to operate.

4)Bidirectional Flow: The flow of their medium is unobstructed in all directions of the valve body, regardless of the direction of medium flow. This makes them ideal for use in pipelines where the flow direction may change depending on the medium.

5)Minimal Wear: When gate valves are fully open, they typically experience minimal wear on their sealing surfaces compared to other valve options. This minimal wear is primarily attributed to the sealing performance of the valve.

6)Minimal Pressure Loss: Due to the laminar flow they provide, gate valves have minimal pressure loss.

7)Zero leakage: Gate valves adopt a tightly sealed gate design, effectively preventing fluid leakage.

8)Wide applicability:Gate valves are suitable for various fluid media, including water, steam, oil, etc., and can meet the needs of different engineering projects.

9)Strong shut-off capability: Gate valves can completely shut off fluid flow, suitable for occasions requiring flow cutoff.

-Disadvantages:

1)Sealing surface susceptible to damage: The two sealing surfaces in contact between the gate and the valve seat have relative friction during opening and closing, which is prone to damage, affecting the sealing performance and service life of the sealing parts, making repairs relatively difficult.

2) Long opening and closing time, large height: Due to the need to fully open or close the gate valve, the gate has a large stroke, requiring a certain amount of space for opening, with a large overall size and requiring a larger installation space.

3)Not suitable for regulation: Gate valves are mainly used for cutting off or passing flow and are not suitable for flow regulation.

6. Applications of Gate Valves

Gate valves are suitable for various industries, including but not limited to:

1) Oil and gas industry: Used for fluid control and safety shutdown in pipeline systems.

2)Chemical industry: Used for fluid control and regulation in chemical production processes.

3)Water supply and drainage systems: Used for fluid control and backflow prevention in urban water supply and drainage systems.

4)Power plants: Used for fluid control and safety protection in boiler pipeline systems.

Applications of gate valves
Source: plumberstar

7. Application Specifications

1) Design and manufacture: Cast steel gate valves according to API 600 (ISO 10434), API 6D.

2) Stainless steel gate valves according to: API 603, API 600.

3) Forged steel gate valves according to: API 602.

4) Inspection and testing: API 598, API 600, or API 6D.

5) Flange connection: ASME B 16.5 for NPS ≤ 24, ASME B16.47 B series API 605, ASME B16.47 A series, MSS SP-44 (for NPS > 24).

6) Butt-weld end: ASME B16.25.

7) Socket-weld end: ASME B16.11.

8) Structure length: ASME B16.10.

9) Temperature and pressure ratings: ASME B16.34.

Application specifications
Source: everlasting

With superior performance, reliable quality, and wide application areas, gate valves have become leaders in the field of industrial valves. When selecting valves, enterprises and engineering projects can consider gate valves according to specific needs to ensure the accuracy of fluid control and the stable operation of systems.

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