Description

Technical Parameters

The Ductile Iron OS&Y Gate Valve provides reliable isolation in high-pressure fluid systems. The external stem thread isolates the operating threads from the working medium, preventing internal corrosion and scaling.

Size Range: DN50 to DN600 (2 to 24 inches)
Pressure Ratings: PN16, PN25, Class 125, Class 150
Operation: Handwheel standard; electric or pneumatic actuators optional via ISO 5210 top flange
Standard Production Lead Time: 25 to 30 days for standard container loads

Technical Specifications

Parameter	Specification Detail
Body & Bonnet Material	Ductile Iron GGG50 (ASTM A536 65-45-12)
Wedge Disc	Ductile Iron fully encapsulated with EPDM / NBR
Stem Material	Rolled Stainless Steel (AISI 420 / AISI 316)
Stem Nut	Brass / Aluminum Bronze for low friction torque
Bonnet Gasket	EPDM / NBR O-ring seal
Coating	Fusion Bonded Epoxy (FBE) internal and external, >= 250 um
Flange Drilling	EN 1092-2 (PN16/PN25), ASME B16.42 (Class 150)
Design Standard	AWWA C515, EN 1074-2, BS 5163

Key Features

Visual Position Indicator: The rising stem configuration allows operators to verify valve status instantly from a distance.

Non-Rising Operating Nut: Independent of the stem travel, reducing operational torque requirements.

Triple O-Ring Stem Seal: Replaceable under full working pressure without draining the pipeline.

Full Port Design: Unobstructed flow path minimizes pressure drop and eliminates sediment collection pockets.

Resilient Seating: EPDM encapsulated wedge provides zero-leakage bubble-tight shutoff, tested to ISO 5208 Rate A.

Applications

Municipal Waterworks: Potable water transmission, pumping stations, and distribution mains.

Fire Protection Systems: Fire main isolation loops (compliant with UL/FM installation parameters).

Industrial Fluid Lines: Cooling water circuits, wastewater treatment plants, and desalination intake.

Manufacturing & Customization (OEM/ODM)

Foundry Capabilities: In-house induction melting and automated resin-sand molding lines ensure consistent casting density and zero internal porosity.

Machining Tolerances: CNC vertical machining centers hold stem and bonnet alignment tolerances within +/- 0.02mm.

Customization Options:

Specific stem alloys (AISI 304, AISI 316L, 17-4PH)

Bypass valve integration for large diameter valves (DN300+)

Specialized flange drilling (ASME, BS, JIS)

Customized body colors and project-specific epoxy thicknesses (>= 300 um)

Testing, Quality & Documentation

Every production batch undergoes strict quality verification prior to dispatch under ISO 9001 quality management systems, holding CE, WRAS, and UL/FM product compliance where applicable:

Hydrostatic Shell Test: Performed at 1.5 x rated pressure.

Seat Leakage Test: Performed at 1.1 x rated pressure using automated test benches.

Coating Adhesion Test: Cross-hatch and holiday pin-hole testing (>= 3kV) on the epoxy coating.

Traceability: Heat numbers cast directly onto valve bodies and bonnets.

Documentation Supplied: Material Test Reports (EN 10204 3.1), hydro-test certificates, and coating thickness logs.

FAQ

Q: Can the stem O-ring seals be replaced while the pipeline is pressurized?

A: Yes. The bonnet design incorporates a back-seat arrangement that isolates the upper stem seals from line pressure during maintenance.

Q: What is the standard lifespan of the fusion-bonded epoxy coating?

A: Applied in compliance with DIN 30677-2, the coating withstands 1000-hour salt spray testing and provides a design life exceeding 25 years in buried or submerged installations.

Q: Are actuator mounting brackets supplied for automated setups?

A: Yes. Top mounting flanges conform to ISO 5210, allowing direct mounting of electric actuators without custom transition plates.