SQK Duplex Stainless Steel Swing Check Valve

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MOQ : 5 Units

SQK Duplex Stainless Steel Swing Check Valve Specification

Structure
Swing Check

Material
Duplex Stainless Steel

Power
Manual

Pressure
PN16 / PN25 / PN40

Media
Water / Oil / Gas / Chemicals

Working Temperature
Up to 250C

Port Size
1 to 24 (DN25 to DN600)

Surface
Shot Blasted / Pickled / Passivated

Shape
Round

Application
Oil, Gas, Water, Petrochemical, Marine Industries

Body Material
Duplex SS ASTM A890 GR 4A / 5A

Test Pressure
As per API 598

Disc Material
Duplex Stainless Steel

End Connection
Flanged

Seal
PTFE / Metal to Metal

Seat Type
Metal or Soft Seated

Coating
Epoxy Painted (External)

Face to Face Dimension
ASME B16.10

Standard
API 6D / BS 1868 / ASME B16.34

Operation
Non-Return Function

SQK Duplex Stainless Steel Swing Check Valve Trade Information

Minimum Order Quantity
5 Units

Supply Ability
200 Units Per Month

Delivery Time
7 Days

About SQK Duplex Stainless Steel Swing Check Valve

A series of API BS 1868 Swing Check Valves is rugged, durable, and known for its quality, integrity, and longevity.

Seals are tight and easy to operate with these valves. Valve can be flanged at one end and bolt weld at the other, with pressure classes ranging from ASME Class 150 to Class 2500 and a variety of materials of construction.

A swing-type check valve has a bolted-cover construction. BS 1868 and API 600 specifications, including the thickness of shell walls, are met.

Main features of SQK Duplex Stainless Steel Swing Check Valve:

Bolted body-cover design, welded seals, and air-pressure seals on the valves
Stainless steel spiral-wound gaskets and graphite filler are used at body-cover joints to prevent leaks
The stem-disc connection between the gate valve and the stem meets API 602 and API 598 standards for strength
Smooth operation with ACME threaded stem
The gland assembly has self-aligning studs and nuts for tightening
Globe and check valves have an integrated hard-faced body seat
No horizontal applications with spring-loaded disc check valves
We offer electrical actuators for gate as well as globe valve
Austenitic SS forgings for bodies and bonnets of cryogenic valves, which can withstand high temperatures, heat loss, and corrosion resistance
The valves can meet NACE MR-0175 requirements along with other special NACE requirements

Cast steel ASME B16.34 Swing Check Valves Pressure Seal Bonnet design

A pressure seal bonnet design is used on ASME B16.34 Swing Check Valves and Y Type Swing Check Valves for high-pressure applications. Thermal power plants, fertilizer plants, oil refineries, and petrochemical plants frequently use these valves in high pressure and high temperature steam, chemical, oil, gas, and water applications. Carbon steel and alloy steel valves are available in buttweld ends and come with pressure ratings of 900, 1500, and 2500.

Superior Duplex Stainless Steel Construction

The valve's body and disc are manufactured from Duplex Stainless Steel, offering enhanced mechanical strength and superior resistance to pitting, crevice, and stress corrosion. This makes it well-suited for critical flow applications where longevity and reliability are essential.

Precision Engineering and Reliable Performance

Designed in accordance with leading industry standards (API 6D, BS 1868, ASME B16.34), each valve undergoes stringent pressure testing per API 598, ensuring leak-proof operation and non-return functionality. Face-to-face dimensions follow ASME B16.10 for easy installation and compatibility.

Versatile Applications Across Industries

With a shot blasted, pickled, and passivated surface and an epoxy-coated exterior, this swing check valve resists both environmental wear and chemical attack. Its wide port size range ensures seamless integration into systems for oil, gas, water, and chemicals.

FAQ's of SQK Duplex Stainless Steel Swing Check Valve:

Q: How does the SQK Duplex Stainless Steel Swing Check Valve operate?

A: The valve functions using a non-return swing check design, allowing fluid to flow in one direction while preventing backflow automatically. It relies on manual operation with no external power source, providing reliable protection against reverse flow in pipelines.

Q: What are the main benefits of using Duplex Stainless Steel for the valve body and disc?

A: Duplex Stainless Steel (ASTM A890 GR 4A / 5A) offers excellent resistance to corrosion, increased strength, and improved durability compared to conventional stainless steels, making the valve ideal for harsh environments and extended service life.

Q: When and where should this swing check valve be installed?

A: The valve is suitable for installation in pipelines transporting water, oil, gas, and chemicals-often used in oil, gas, water supply, petrochemical, and marine industries. It should be installed where non-return flow is required to protect equipment and maintain process integrity.

Q: What is the process for pressure testing this valve?

A: All SQK Duplex Stainless Steel Swing Check Valves are tested in accordance with API 598 standards, involving both hydrostatic and pneumatic pressure checks to ensure leak-free performance under actual working conditions.

Q: Can the valve be used for both metal and soft seat applications?

A: Yes, the SQK swing check valve offers both metal and soft seated options, allowing users to choose the best seat type for their application requirements, whether handling abrasive media or seeking tight shutoff capabilities.

Q: What is the standard surface treatment for these valves?

A: Valves are shot blasted, pickled, and passivated to optimize corrosion resistance. Externally, they are epoxy painted for added protection against environmental factors and wear, ensuring a long operating life even in aggressive conditions.

Q: What is the available port size range for these valves?

A: The SQK Swing Check Valve is available in port sizes from 1 inch to 24 inch (DN25 to DN600), allowing for installation in a variety of pipeline systems, from small process lines to large industrial flow networks.

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