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Large forged bolted bonnet valves

Velan large forged bolted bonnet valves are built for high pressure and high-temperature needs, with a proven track record in thermal and nuclear power plants, as well as oil and gas applications worldwide. Reliable and durable for the toughest environments.

Large industrial metal valves with blue handles are arranged in rows inside a spacious, well-lit factory or warehouse with beams, cranes, and machinery visible in the background.

Design

Molten metal in a furnace, glowing brightly. The scene depicts metal components in various stages of heating, with some parts appearing red hot, while others have a cooler, metallic appearance. The industrial setting suggests a manufacturing or foundry environment.

Body and bonnet are made from high-quality forgings throughout the size range. Available in flexible wedge gate, parallel slide gate, globe stop-check, globe needle-disc, y-pattern, piston check, swing check, and tilting disc check.

Bonnet

A close-up cutaway view of a mechanical device, showcasing interlocking metal components, bolts, and a central blue cylindrical rod. The intricate assembly reveals the interior structure and arrangement of parts.

Stronger leakproof bolted body-bonnet joint tightness with a higher bolting torque. Recommended over pressure seal valves for any applications with pressure below 500 psi (34.5 bar). Options for lip seal weld on bonnet for greater emissions control.

Guiding System

Cutaway illustration of a mechanical valve, showcasing internal components such as a cylindrical housing, colored moving parts, and seals. The design displays the functional structure and assembly of the valve's inner mechanisms.

Close attention is paid to body and disc guide tolerances to minimize the potential for galling, binding, and/or gouging during valve opening and closing. For stainless valves and high temperature service, hard-faced grooves are precision-guided within welded-in machined guides.

Live-loaded (options)

Close-up view of a mechanical component with a red, ribbed, cylindrical part sandwiched between metallic fittings, featuring bolts and a central rod, set against a light blue background.

Velan pioneered live-loaded valves in 1972 for Atomic Energy of Canada Limited (AECL) to prevent nuclear leakage and has since supplied live-loaded valves for nuclear and non-nuclear service. This technology extends low-emission service life under demanding conditions, with Belleville springs keeping the stem tight for long periods without maintenance.

PressureASME 150-4500, PN 250-320
SizeNPS 2-60 (DN 50-1500)
Tests and Design StandardsASME B16.10 Flanged Long or Short Pattern, ASME B16.11, ASME B16.20, ASME B16.25, ASME B16.34, ASME B16.47, ASME B16.5, ASME Section III, ASME Section VIII, ASME Section IX, EN 1092, EN 1333, EN 12516-2, EN 12266-1&2, ISO 15848-1, API 594, API 600, API 603, API 609, API 623, API 622, API 624, API 598
Fugitive EmissionsAPI 622 qualified packing options available.
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