***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Hydraforce directly.***
The Hydraforce HNV12-20A-0-U (5421490) is a high-performance needle valve designed for precise flow control in hydraulic systems. This screw-in, cartridge-style valve features a variable orifice that adjusts from fully closed to fully open with a counterclockwise rotation, allowing for linear and accurate adjustments. It is rated for high-pressure operations up to 350 bar (5075 psi) with proof pressures reaching 689 bar (10000 psi) and burst pressures up to 1379 bar (20000 psi). The HNV12-20A-0-U is engineered to fit both HyPerformance and standard ductile iron bodies, ensuring versatility across different system requirements. The valve's compact design includes hardened parts for enhanced durability and longevity. It offers a variety of adjustment options and features a positive shutoff mechanism that prevents any leakage when closed. Maximum internal leakage at shutoff is minimal at just 0.15 ml/min. This model operates effectively within a wide temperature range depending on the seal material used: from -40°C to +100°C with Buna N seals, -26°C to +204°C with fluorocarbon seals, and -54°C to +107°C with urethane seals. It can handle fluid viscosities ranging from 7.4 to 420 cSt and is compatible with both mineral-based and synthetic hydraulic fluids with lubricating properties. For installation, the HNV12-20A-0-U utilizes either VC122 or HVC122 cavity configurations without any orientation restrictions. Cartridge installation torque specifications are between 156 to 170 Nm (115 to 125 ft-lb). The unit itself weighs approximately 0.32 kg (0.50 lb), making it easy to handle during maintenance or setup processes. Seal kits such as SK122NM115, SK122VM115, and SK122U0 are available for different environmental conditions, ensuring that the valve maintains its integrity and performance throughout its operational lifespan.