Description

Bolted Bonnet IBR Globe Valve Manufacturer in India

Unitek Valves manufactures, supplies, and exports high-performance Bolted Bonnet IBR Globe Valves engineered for precise steam flow regulation, throttling, and positive shut-off in boiler systems and power generation utilities. Built with a heavy-duty cast steel body and an accessible flanged bonnet joint, our valves facilitate inline inspection and routine maintenance during scheduled plant shutdowns. Fully compliant with Indian Boiler Regulations (IBR Form III-C) and international standards, Unitek Valves supplies high-integrity flow control solutions to EPC contractors, power plants, and process industries across India and global export markets.

What is a Bolted Bonnet IBR Globe Valve?

A Bolted Bonnet IBR Globe Valve is a linear-motion flow control valve designed specifically for steam throttling and isolation in pressurized piping networks governed by Indian Boiler Regulations.

• Precise Flow Regulation: Unlike gate valves designed solely for open/close duty, a globe valve uses a movable disc operating perpendicular to the seat, allowing fine fluid modulation and steam throttling.

• Maintainable Body-Bonnet Joint: Features a flanged bonnet connection secured with high-tensile alloy studs and a spiral-wound gasket, enabling easy inline disassembly for seat lapping, disc replacement, or gland packing renewal.

• OS&Y Construction: Outside Screw & Yoke design keeps stem threads outside the fluid boundary, protecting them from high-temperature steam erosion while providing clear visual position indication.

Flow Control & Throttling Mechanism

1. Stem Movement: Turning the handwheel rotates the stem within the yoke nut, driving the disc linearly toward or away from the body seat without applying rotational friction to the sealing face.

2. Throttling Action: Adjusting the distance between the disc and seat ring alters the internal flow passage, enabling accurate flow rate modulation and pressure control across steam lines.

3. Positive Shut-Off: When fully closed, the disc compresses firmly against the hardfaced body seat ring, establishing a tight mechanical seal to halt fluid flow.

Key Features & Construction

• Heavy-Duty Cast Body: Engineered with generous wall thickness to withstand pressure surges and thermal cycling in steam headers.

• Hardfaced Trim (Stellite Overlays): Seating faces and plug discs feature Cobalt-base alloy (Stellite) or 13% Cr overlays to prevent steam wire-drawing, erosion, and thermal galling.

• Flexible Gland Sealing: Deep stuffing box packed with die-formed flexible graphite rings ensures low stem friction and zero external leakage.

• Compliance with Standard Codes: Manufactured to BS 1873 design standards and ASME B16.10 face-to-face dimensions for seamless drop-in piping interchangeability.

Materials & Pressure Classes Overview

• Cast Carbon Steel (ASTM A216 WCB): Standard specification for saturated steam lines, boiler feedwater loops, and non-corrosive power utilities (Class 150 & Class 300).

• Stainless Steel (ASTM A351 CF8 / CF8M): Austenitic steel grades (SS304 / SS316) for corrosive steam condensate, chemical process lines, and clean utility networks.

• Pressure Ratings: Class 150 and Class 300 flanged configurations engineered to match standard ASME pressure-temperature ratings.

Applications

• Boiler House & Steam Piping: Main boiler steam outlets, soot blower lines, continuous blowdown bypass loops, and auxiliary steam headers.

• Power Generation: Turbine drain regulation, boiler feedwater control, air ejector steam lines, and sampling point isolation.

• Process Steam Networks: Fine steam throttling across chemical processing, textile drying, paper mill digesters, and sugar refinery evaporator circuits.

Why Choose Unitek Valves?

• IBR Form III-C Certified: Every valve undergoes strict material verification, non-destructive examination, and hydrostatic seat/shell pressure testing (API 598) witnessed and certified by authorized IBR inspectors.

• Engineered for Throttling: Precision-machined plug and regulating discs ensure stable flow control without vibration or premature seat erosion.

• Mumbai Manufacturing & Global Supply: Supplying certified bolted bonnet globe valves across India with complete technical documentation for export destinations.