Does the Circulation Switch, VSF Type automatically switch to the higher-pressure source and block the alternate port to ensure uninterrupted hydraulic oil supply?

Circulation Switch, VSF Type: Yes. The VSF valve automatically directs flow from either P1 or P2 to U by selecting the higher-pressure source and simultaneously blocks the alternate port using a movable ball mechanism, ensuring uninterrupted hydraulic oil supply. Its galvanized steel construction, NBR sealing, and wide operating temperature range further guarantee durable, leak-free performance in demanding environments.

Can the Circulation Switch, VSF Type operate reliably in environments with aggressive fluids or saline exposure given its galvanized steel construction and NBR seals?

Circulation Switch, VSF Type, constructed from galvanized steel with NBR (nitrile rubber) seals, offers good general resistance to wear, corrosion and many hydraulic fluids. Galvanized steel provides a protective zinc coating that improves durability in humid or mildly corrosive atmospheres and NBR seals deliver reliable sealing and compatibility with a wide range of oils and non-aggressive fluids across the stated temperature range (-20°C to +100°C). However, for environments with aggressive chemicals or prolonged saline (marine) exposure, caution is required. Galvanized steel is not as corrosion-resistant as stainless steel or specially coated alloys when exposed to chloride-rich environments; over time, salt can cause pitting, coating breakdown and accelerated corrosion. NBR also has limited chemical resistance: it performs poorly with many acids, ketones, some solvents and certain aggressive chemicals compared to more resistant elastomers (e.g., FKM/Viton, EPDM). Conclusion: Circulation Switch, VSF Type can operate reliably with typical hydraulic oils and in mildly corrosive or damp environments. For aggressive fluids or continuous saline/marine exposure, specify materials with higher corrosion and chemical resistance (stainless steel body, alternative seal compounds) or consult the manufacturer for suitability, protective coatings and recommended seal materials before deployment.

Circulation Switch, VSF Type

All products, Other high-pressure valves/

Additional information

Material	CS – steel (cast iron)

The VSF valve ensures reliable hydraulic oil supply by automatically directing flow from either connection P1 or P2 to connection U, always selecting the source with the higher pressure while the alternate port is securely blocked by a movable ball mechanism. Designed for durability and efficiency, the valve body and internal components are manufactured from high-quality galvanized steel, providing excellent resistance to wear and corrosion even in demanding environments. Equipped with practical mounting holes, the valve allows for quick and secure installation across a wide range of hydraulic systems. The use of NBR sealing guarantees optimal tightness and long-lasting performance, while the broad operating temperature range from -20°C to +100°C ensures consistent functionality in both low and high temperature conditions. This combination of intelligent design, robust materials, and versatile application makes the VSF valve a dependable solution for enhancing the safety, efficiency, and reliability of modern hydraulic systems.

List of product variants

Article number	Product variant name	Nominal inner diameter	Working pressure [bar]
DC-VSF-04	VSF circulation switch, GW 1/4" BSP	-	500
DC-VSF-06	VSF circulation switch, GW 3/8" BSP	-	500
DC-VSF-08	VSF circulation switch, GW 1/2" BSP	-	500
DC-VSF-12	VSF circulation switch, GW 3/4" BSP	-	350
DC-VSF-16	VSF circulation switch, GW 1" BSP	-	350

The VSF valve ensures reliable hydraulic oil supply by automatically directing flow from either connection P1 or P2 to connection U, always selecting the source with the higher pressure while the alternate port is securely blocked by a movable ball mechanism. Designed for durability and efficiency, the valve body and internal components are manufactured from high-quality galvanized steel, providing excellent resistance to wear and corrosion even in demanding environments. Equipped with practical mounting holes, the valve allows for quick and secure installation across a wide range of hydraulic systems. The use of NBR sealing guarantees optimal tightness and long-lasting performance, while the broad operating temperature range from -20°C to +100°C ensures consistent functionality in both low and high temperature conditions. This combination of intelligent design, robust materials, and versatile application makes the VSF valve a dependable solution for enhancing the safety, efficiency, and reliability of modern hydraulic systems.