Send Inquiry

Request To Call Back

A351 CN7M Alloy 20 Piston Valve

Get a Price/Quote

MOQ : 5 Units

A351 CN7M Alloy 20 Piston Valve Specification

Structure
Piston Type Valve

Material
A351 CN7M (Alloy 20)

Power
Manual

Pressure
Class 150 / 300 / 600

Media
Water, Chemicals, Acidic and Corrosive Media

Working Temperature
-29C to +180C

Port Size
to 16 (DN 15 to DN 400)

Surface
Shot Blasted / Pickled and Passivated

Shape
Straight Pattern

Application
Corrosive Fluids, Acids, Chemical Processing, Petrochemicals

Sealing
PTFE Graphite Rings

Bonnet
Bolted Bonnet

Test Standard
API 598

Operation
Handwheel

Leakage Class
Class VI (Bubble Tight Shut Off)

Face to Face Standard
ASME B16.10

Corrosion Resistance
Excellent (suitable for H2SO4 and other strong acids)

Design Standard
ASME B16.34 / API 602

End Connection
Flanged / Screwed / Socket Weld

Body Material
Alloy 20 (ASTM A351 CN7M)

A351 CN7M Alloy 20 Piston Valve Trade Information

Minimum Order Quantity
5 Units

Supply Ability
200 Units Per Month

Delivery Time
7 Days

About A351 CN7M Alloy 20 Piston Valve

A351 CN7M Alloy 20 Piston Valve

Full port forged steel isolation valves with a maximum operating pressure of 1973 psig/136 Barg and a maximum operating temperature of 800oF/427oC. The burnished piston and metal reinforced graphite rings provide leak-proof shut off and allow Piston Valves to be operated at higher temperatures, while also extending operating life.

Piston Valves are available in Socket Weld, BSPT, and NPT end connections. Flanged ends can be supplied upon request. Piston Valves are ideal for saturated and superheated steam, and hot water applications.

Piston Valves Feature :

Leak-proof isolation
Sizes from 1/2"/15mm to 1-1/2"/40mm
Choice of socket weld or threaded connections
Compatible with ASME
Resistant to cavitation
All sealing valve components may be easily replaced in-line
Long-term operation. Piston valve design ensures actuation even after many years without operation
Fire-proof performance

Design Standards :

ASME (B16.34, B16.5)
Inspection and testing (API 598)
Leak test (ANSI/FCI 70-2 )
Fire test (API SPEC 6FA : 1999

Design features of Piston Valves :

Materials of Construction

Body and Bonnet ASTM A105N / A350 LF2 Forged Steel
Spindle SS T304
Ring Valve SS T3016 + Graphite
Piston SS 17-4 PH
Spacer CA 40
Belleville Washer ASTM A231
Name Plate SS 304

Exceptional Corrosion Resistance

Manufactured using Alloy 20 (ASTM A351 CN7M), these piston valves offer outstanding protection against sulfuric acid and other aggressive chemicals. Their high resistance ensures prolonged service life and minimized maintenance, making them well-suited for applications in chemical processing and petrochemical industries.

Reliable Shut-Off Performance

The integration of PTFE graphite rings and precise engineering guarantees Class VI (bubble-tight) leakage shutoff. This superior sealing capability is crucial for handling corrosive and hazardous fluids, ensuring operational safety and preventing leaks in critical chemical and process systems.

Versatile Installation and Operation

Available in multiple end connectionsflanged, screwed, and socket weldthese valves can be easily incorporated into new or existing piping layouts. Their straightforward handwheel operation allows for manual flow control, while robust construction ensures suitability across a wide range of pressures, temperatures, and port sizes.

FAQs of A351 CN7M Alloy 20 Piston Valve:

Q: How does the A351 CN7M Alloy 20 piston valve handle highly corrosive media like sulfuric acid?

A: The valve is made from Alloy 20 (ASTM A351 CN7M), which possesses excellent corrosion resistance, especially against sulfuric acid and similar aggressive substances. This material choice ensures reliable operation even in the harshest chemical environments.

Q: What end connection options are available for installing this piston valve?

A: This piston valve is available with flanged, screwed, and socket weld end connections, allowing for flexible installation in a variety of piping systems and ensuring compatibility with industry-standard networks.

Q: When should I choose a bolted bonnet type valve like this one?

A: Bolted bonnet valves are ideal when strength and tight sealing are required under high pressures or when handling hazardous fluids. The bolted bonnet promotes a secure seal, enabling maintenance access while maintaining structural integrity.

Q: Where is the A351 CN7M Alloy 20 Piston Valve typically used?

A: This valve is primarily utilized in applications involving corrosive fluids, such as acid plants, chemical processing, petrochemicals, and water treatment facilities. Its corrosion-resistant properties make it suitable for a range of aggressive media.

Q: What standards does this piston valve comply with for design and testing?

A: The valve is designed as per ASME B16.34 and API 602 standards, with testing conducted under API 598 protocols. Face to face dimensions meet ASME B16.10, ensuring broad engineering compatibility.

Q: How does the PTFE graphite ring sealing benefit valve operation?

A: PTFE graphite rings provide robust sealing against leaks (Class VI bubble tight), reduce wear, and help maintain tight shutoff performance in the presence of corrosive or high-temperature media, increasing operational reliability.

Q: What is the typical process for selecting the correct port size and pressure class?

A: Selection depends on the specific applications flow requirements, media properties, and system pressure. Port sizes range from to 16 inches (DN 15 to DN 400), and pressure classes available are 150, 300, and 600, covering a broad spectrum of industrial needs.

Tell us about your requirement