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Home > Industrial Equipment & Components > Valve > Butterfly Valve > Duplex Stainless Steel Ball Valve CB/T3191 With Locking Handle and Blowout-Proof Stem

Duplex Stainless Steel Ball Valve CB/T3191 With Locking Handle and Blowout-Proof Stem

Duplex Stainless Steel Ball Valve CB/T3191 With Locking Handle and Blowout-Proof Stem thumbnail-3

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Duplex Stainless Steel Ball Valve CB/T3191 With Locking Handle and Blowout-Proof Stem thumbnail-5

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Duplex Stainless Steel Ball Valve CB/T3191 With Locking Handle and Blowout-Proof Stem photo-4

Duplex Stainless Steel Ball Valve CB/T3191 With Locking Handle and Blowout-Proof Stem photo-5

Product Spotlights

Engineered for critical service, this Duplex Stainless Steel Ball Valve combines exceptional chloride corrosion resistance with high mechanical strength. Its integrated blowout-proof stem ensures operator safety by preventing stem ejection under pressure, while the locking handle enables secure isolation for LOTO compliance. Manufactured to CB/T3191 standard, it delivers reliable, long-lasting performance in marine, offshore, and chemical processing applications, backed by ISO9001 certified production.

Negotiable MOQ: 1 Unit (Price negotiable depending on order volume and customization)

Key Specifications

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Standard:

CB/T3191

Application:

Other, Marine

Material:

Duplex Stainless Steel (2205/2507)

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Shanghai Zhibang Valve Manufacture Co.,ltd

1Yr

Payment & Shipping

Payment Methods:

Port of Shipment:

China

Delivery Detail:

Delivery time depends on order quantity.

Product Details
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Standard CB/T3191

Application Other, Marine

Material Duplex Stainless Steel (2205/2507)

Stem Design Blowout-Proof Stem

Handle Type Locking Handle

Connection Type Flanged or Threaded Ends

Size Range DN15 to DN300 (1/2“ to 12“)

Pressure Rating PN16 to PN40 (Class 150 to Class 300)

Operation Manual Lever Handle

Seat Material PTFE/RPTFE or Metal Seated Options

As a professional manufacturer with ISO9001 certified quality management since 2016, Shanghai Zhibang Valve Manufacture Co., Ltd. proudly presents our high-performance Duplex Stainless Steel Ball Valve designed to CB/T3191 standard. Engineered for demanding applications where corrosion resistance and structural integrity are non-negotiable, this valve integrates a robust locking handle and a critical blowout-proof stem design. It represents our commitment to providing reliable flow control solutions that meet the stringent requirements of global industries, backed by our annual export experience across diverse markets from North America to Oceania.

Product Features & Technical Advantages:

Superior Corrosion & Stress Resistance: Constructed from Duplex Stainless Steel (grades like 2205 or 2507), this valve offers an optimal balance of high strength and exceptional resistance to pitting, crevice corrosion, and stress corrosion cracking, especially in chloride-containing environments. Its yield strength is approximately double that of standard 316 stainless steel.
Blowout-Proof Stem Design for Ultimate Safety: A cornerstone feature is the integrated blowout-proof stem. This design mechanically locks the stem in place, preventing it from being ejected under high internal pressure or unexpected line failures, thereby ensuring operator safety and system integrity.
Locking Handle for Secure Operation: The valve is equipped with a locking handle mechanism that can be secured with a padlock. This feature is vital for safety procedures, preventing unauthorized or accidental operation, and is crucial for applications requiring positive isolation in compliance with lockout/tagout (LOTO) protocols.
Compliance with CB/T3191 Standard: Manufactured in strict accordance with the Chinese CB/T3191 standard for marine valves, it guarantees dimensional interchangeability, specified material performance, and testing requirements suitable for marine and offshore applications.
Versatile End Connections & Pressure Ratings: Available with flanged (to ANSI, JIS, DIN, GB standards) or threaded ends (NPT, BSP) to suit various piping systems. It covers a wide pressure range to handle demanding service conditions.
Low Maintenance & Long Service Life: Features like reinforced PTFE seats ensure reliable sealing with low torque operation. The duplex steel body provides excellent erosion and cavitation resistance, leading to reduced maintenance cycles and a prolonged service life even in abrasive or high-velocity flows.

Detailed Technical Specifications:

Parameter	Specification / Option
Body & Trim Material	Duplex Stainless Steel (2205, 2507), Super Duplex Optional
Design & Manufacturing Standard	CB/T3191 (Equivalent to marine industry requirements)
Stem Design	Blowout-Proof, Anti-Static Design
Handle Type	Lever Handle with Locking Hole (Padlockable)
Connection Types	Flanged (RF, RTJ), Threaded (NPT, BSPT, BSPP)
Nominal Size Range	DN15 (1/2") to DN300 (12")
Pressure Rating	PN16, PN25, PN40 (Class 150, Class 300)
Seat & Seal Material	Standard: PTFE/RPTFE; Optional: Metal Seated (for high temp)
Temperature Range	-20°C to +200°C (with PTFE seats); Higher with metal seats
Operation	Quarter-Turn Manual Operation
Flow Characteristic	Full Port or Reduced Port Design Available
Applicable Media	Seawater, Chemicals, Oil & Gas, Corrosive Fluids, Steam

Benefits for Your Operations:

Enhanced Safety: The combination of blowout-proof stem and locking handle significantly mitigates operational hazards, protecting personnel and assets.
Reduced Total Cost of Ownership: The exceptional durability and corrosion resistance of duplex steel minimize replacement frequency and unplanned downtime, offering excellent long-term value.
Reliability in Harsh Environments: Proven performance in marine, offshore oil & gas, chemical processing, and pulp & paper industries where exposure to corrosive elements is constant.
Regulatory Compliance: Helps meet safety and quality standards required in international projects, facilitated by our ISO9001 certification.
Global Supply Capability: With ports of shipment in Shanghai, Guangzhou, Hong Kong, and Beijing, we ensure efficient and flexible logistics to support your projects worldwide.

Our commitment to quality is validated by our ISO9001 certification and a track record of exporting to over a dozen major markets, including North America, Europe, Southeast Asia, and the Middle East, with an annual export value consistently ranging between US$1 Million and US$1.5 Million. This global acceptance underscores the reliability and performance of our Duplex Stainless Steel Ball Valves. We combine advanced manufacturing expertise with a deep understanding of industrial requirements to deliver a product that doesn't just control flow—it safeguards your process. For a valve solution built to endure and perform, contact us to discuss your specifications or request a detailed quotation.

Frequently Asked Questions (FAQ):

Q: What is the primary advantage of using Duplex Stainless Steel over standard 316SS for this ball valve?
A: Duplex stainless steel offers a superior combination of strength (approximately twice the yield strength of 316SS) and enhanced corrosion resistance, particularly against stress corrosion cracking and pitting in chloride environments like seawater. This results in a more durable, longer-lasting valve for demanding applications.
Q: How does the blowout-proof stem mechanism work, and why is it important?
A: The blowout-proof stem is designed with a mechanical interlock or a shoulder that engages with the valve body. This prevents the stem from being forcibly ejected out of the valve if internal pressure builds behind the ball, a critical safety feature that protects operators and maintains system integrity under failure conditions.
Q: Can the locking handle be used with different types of locks?
A: Yes, the lever handle is typically designed with a standardized locking hole that accommodates most common padlocks used in industrial lockout/tagout (LOTO) procedures, allowing for secure, positive isolation.
Q: Is the CB/T3191 standard recognized internationally?
A> While CB/T is a Chinese national standard, the CB/T3191 specification is well-regarded and widely accepted, especially in the marine and shipbuilding industries. Its requirements for materials, dimensions, and testing ensure high quality and are often compatible with or equivalent to other international marine valve standards.
Q: What media is this valve suitable for?
A: This valve is ideal for handling corrosive media such as seawater, chlorides, acids, alkalis, oil, and gas. The specific grade of duplex steel (2205 or 2507) should be selected based on the chloride content and temperature of your application. Compatibility for specific media can be confirmed upon request.
Q: Are different end connection standards available?
A: Absolutely. We offer a variety of end connections to match global piping standards, including ANSI flanges, DIN flanges, JIS flanges, and threaded ends like NPT and BSP. Please specify your requirement when inquiring.
Q: What is the lead time for an order of these valves?
A: Lead times vary based on order quantity, size, and material grade. Standard configurations typically have shorter lead times. We provide estimated timelines upon receipt of your detailed specifications to ensure timely project planning.
Q: Do you provide custom modifications or special coatings?
A: Yes, as a manufacturer, we have the capability to discuss customizations such as special trim materials, extended stems, specific paint or marking requirements, and other modifications to suit unique project needs. Please contact our technical sales team with your requests.