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Class 300 Piston Valve

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Class 300 Piston Valve Specification

Structure
Bolted Bonnet, Rising Stem

Material
Stainless Steel / Carbon Steel

Power
Manual

Pressure
Class 300 (Approx. 50 bar)

Media
Water, Oil, Gas, Steam

Working Temperature
-20C to 425C

Port Size
1/2 to 12 (15mm to 300mm)

Surface
Anti-corrosive coated / Polished

Shape
Straight (inline)

Application
Steam, Oil, Gas, Chemical Industries

Packing
Graphite / PTFE

Bonnet Type
Bolted Bonnet / Pressure Seal Bonnet

Body Test Pressure
Up to 76 kg/cm²

Flow Direction
Bi-directional

Product Standard
API 623 / BS 5154 / DIN 3356

Trim Material
Stainless Steel / Alloy Steel

Leakage Class
Tight Shut-Off, Zero Leakage

Operation
Handwheel Operated

Seat Type
Renewable Seat

End Connection
Flanged to ANSI B16.5 or Screwed Ends

Color
Black / Silver Coated

Class 300 Piston Valve Trade Information

Minimum Order Quantity
5 ,

Supply Ability
200 Per Month

Delivery Time
7 Days

About Class 300 Piston Valve

Class 300 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

Zero Leakage and Tight Shut-Off Performance

This piston valve is engineered to deliver zero leakage under demanding conditions. The renewable seat and robust sealing mechanism ensure tight shut-off, effectively preventing any process media from escaping. This feature is especially vital in industries such as chemicals and steam where safety and environmental compliance are paramount.

High Durability with Anti-Corrosive Protection

Constructed from stainless steel or carbon steel, and finished with an anti-corrosive coating or polished surface, the valve resists corrosion even in harsh industrial environments. Coupled with a bolted or pressure seal bonnet and graphite/PTFE packing, it promises reliability and long service life, reducing maintenance costs.

Versatile Applications & Certified Quality Standards

Meeting industry standards such as API 623, BS 5154, and DIN 3356, this piston valve is ideal for diverse applications like steam, oil, gas, or water. Its bidirectional flow design, a range of seat and trim materials, and compatibility with various media ensure flexible use in refineries, power plants, pharmaceuticals, and chemical processing.

FAQs of Class 300 Piston Valve:

Q: How does the Class 300 piston valve ensure zero leakage in operation?

A: The valve features a precisely engineered renewable seat and a robust sealing mechanism that work together to eliminate any leakage, ensuring tight shut-off even at high pressures and temperatures, thus offering total reliability in critical service conditions.

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

A: You can choose between flanged ends conforming to ANSI B16.5 or screwed ends, providing installation flexibility based on your piping requirements and system design.

Q: When should a bolted bonnet be selected over a pressure seal bonnet?

A: A bolted bonnet is generally preferred for standard pressures and easier maintenance, while a pressure seal bonnet is ideal for higher pressures and temperatures, as it enhances the seal with increasing internal pressure, ensuring added safety in demanding environments.

Q: Where are Class 300 piston valves commonly used?

A: These valves are widely deployed in industries such as oil and gas, steam systems, chemical plants, and water treatment facilities throughout India and globally, owing to their reliability and compliance with major international standards.

Q: What is the process for maintaining the renewable seat of this valve?

A: The renewable seat allows for straightforward removal and replacement once worn. Maintenance involves shutting off the valve, dismantling the bonnet, and replacing the seat component, significantly extending the overall valve life cycle.

Q: How does the anti-corrosive coating benefit industrial users?

A: The anti-corrosive coating, available in black or silver, protects the valves body and trim against rust and chemical attack, ensuring sustained operation and reduced downtime in aggressive environments.

Q: What are the main advantages of using a handwheel operated piston valve for manual operation?

A: Handwheel operation provides precise flow control, enables easy manual actuation without external power, and is well-suited for both frequent and occasional operation, making it practical for various industrial processes.

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