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Resilient-seated ball valves

Memoryseal™ ball valves offer reliable, long-lasting performance across tough applications. With unique in-tension seat technology, they can consistently endure varying pressures and temperatures. Available in multiple configurations, they’re perfect for steam, cryogenics, oxygen, and more.

An industrial facility with multiple metal pipes, valves, and gauges, including a red warning light on a control box; the background shows more piping and an outdoor setting under a blue sky.

In-tension flexible seat

A close-up illustration shows a labeled "Flexible area" with white arrows pointing upward and outward, highlighting movement or flexibility between intersecting surfaces, with blue and green shading.

The Memoryseal™ in-tension flexible seat is the only successful design to function in tension rather than compression. With a tensile strength of 3600 psi (25 MPa), compared to 1800 psi (12.5 MPa) in compression, it provides reduced fatigue, superior sealing performance, and longer cycle life, by compensating automatically for wear and fluctuations of pressure and temperature.

Memoryseal™ split-body ball valve

A close-up, cross-sectional view of a metallic ball valve, showing a green spherical ball inside the valve body with various mechanical components and fasteners visible around it.

Velan Memoryseal™ split‑body, resilient‑seated ball valves are offered with either a floating or trunnion‑mounted ball and are engineered for durability, versatility, and high performance across a wide range of applications, including NACE specifications when required.

Memoryseal™ unibody ball valves

A detailed 3D rendering of a cutaway ball valve shows internal components, including a green spherical ball, seals, and housing, illustrating the flow control mechanism inside the valve.

Velan Memoryseal™ unibody resilient-seated ball valves are designed with unique 3-way packing arrangements for superior stem sealing to handle an extensive range of applications. These rugged, versatile, and high-performance unibody Memoryseal resilient-seated ball valves meet NACE specifications.

Memoryseal™ top-entry ball valve

Cross-sectional rendering of a mechanical valve assembly, showing internal components such as a blue shaft, a green spherical element, seals, and metal housing with detailed connections and fittings.

Velan Memoryseal™ top-entry resilient-seated ball valves can be easily serviced or replaced in-line while the integrity of the valve is not affected. These rugged, versatile, resilient-seated ball valves can meet NACE specifications.

PressureASME 150-600, WOG up to 2000
SizeNPS 1/4-24 (DN 8-600)
Tests and Design StandardsAPI 608, ASME B16.34, PED2014/68/EU QA Module D, API 607 Rev.5/ISO 10497, API 598, SIL 3 capable (per IEC 61508), TA-Luft, Section 3.1.8.4
Fugitive EmissionsDual-qualified to API 641 and ISO 15848-1 fugitive emissions requirements. All graphite packings are qualified to API 622 requirements.
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