NOVA Hydromet - Letdown valve

Letdown and Vent Angle Control Valves

NOVA produces robust Letdown and Vent Angle Control Valves for high temperature, pressure, and acidic applications. Our engineering team’s specialized knowledge of autoclaves and the valves that control them is second-to-none in the industry.

We take a holistic approach to designing control valves, trim, and blast tubes for Hydromet. These are complex systems with multiple factors impacting valve performance and lifespan.

Mineral Processing Facilities Downtime

Downtime related to Hydromet products cost mineral processing facilities hundreds of millions per year. NOVA has the technology, and most importantly, the knowledge to eliminate unpredicted valve failure and maximize your return.

Hydromet Letdown Control Valve

As Letdown Control Valves act as the lynchpin for autoclave circuits, it is critical to use the right materials in their construction. Our designs aren’t pieced together — they are created from mono blocks of  materials like Titanium Grade 12.

NOVA—Severe Service Metal Seated Ball Valves

Severe Service Metal Seated Ball Valves

NOVA specializes in ball valves with material technology and valve designs that meet the most stringent standards of today’s hydrometallurgy industries. 

These high-performance valves are designed and manufactured to solve severe service problems effectively and efficiently.

Tight Quality Control

A key differentiator with NOVA is the fact that we own the entire production process from engineering, to material manufacturing, assembly, and testing.
NOVA Hydromet —Manufacturing Process: Engineering


NOVA—Material Manufacturing for Hydrometallurgy Equipment
Material Manufacturing
NOVA Hydromet —Manufacturing Process: Assembly


NOVA Hydromet —Manufacturing Process: Testing


Our vertically integrated manufacturing process allows for exceptional traceability and accountability, resulting in consistently high-quality equipment delivered to your site on time and on budget.

DSS Valves—Severe Service Knife Gate Valves
DSS Valves

Severe Service Knife Gate Valves

DSS Valves offer zero leakage, bi-directional isolation that reliably meets or exceeds API, ASME and MSS specifications and can isolate from full vacuum to ASME Class 1500/PN 250 pressures (3750 psig/250 barg). 

NOVA has supplied over 10,000 GSGs in leaching circuits around the world on six continents, including most HPAL and POx facilities. DSS manufactures a full range of isolation valves and a unique slurry throttling control valve.

Guided Shear Gate Design (GSG)

The DSS Guided Shear Gate Design (GSG) consists of two key elements: a shearing tip and internal gate guides. 

From open to close the gate is guided the entire way, removing any option to deflect when solids are encountered. When the material is struck by the shearing tip, it is fractured and angled away, enabling zero leakage where the gate meets the primary seal.

DSS Valves — Guided Shear Gate design (GSG)
HY-GRADE—Severe Service Check Valves

Severe Service Check Valves

NOVA Severe Service Check Valves have proven success on autoclave duty in many sites with performance unrivalled by alternative designs.
The success is easy to explain; the valve is machined from bars or forgings which allows NOVA to offer a customized venturi inlet sized to the process flow, much like a control valve. This leads to flapper stability and long life. And while a check valve is not designed to be used as an isolation valve, NOVA Severe Service Check Valves are shipped drop-tight; they offer the best non-return flow blockage in the industry.
NOVA Hydromet—Autoclave Centred
A large scale nickel operation in Papua New Guinea has advised that not a single NOVA Severe Service Check Valve in autoclave utility services has failed since installed on the original project.
A POx plant in Chile has experienced NOVA Severe Service Check Valve service life in excess of 14 years.