Does the Circulation switch, type VSF, allow connection to both P1 and P2 simultaneously, or does it automatically select and block the lower-pressure source?

The Circulation switch, type VSF does not allow simultaneous connection of P1 and P2 to U. It automatically selects the higher-pressure source: the connection with higher oil pressure (either P1 or P2) supplies hydraulic oil to U, while the other (lower-pressure) connection is automatically blocked by a movable ball.

How does the Circulation switch, type VSF, prevent backflow when switching between P1 and P2?

The Circulation switch, type VSF prevents backflow between P1 and P2 by using an internal movable ball that automatically blocks the lower-pressure inlet. When P1 and P2 are connected, the inlet with the higher hydraulic pressure opens to supply oil to U; simultaneously, the ball shifts to seal off the other (lower-pressure) connection, preventing reverse flow. The valve body and ball are galvanized steel with NBR seals, ensuring a tight seal and reliable switching across the specified temperature range (-20Â°C to +100Â°C).

Can the Circulation switch, type VSF handle differing oil viscosities or fluids other than hydraulic oil?

Circulation switch, type VSF is designed to supply hydraulic oil between connections P1/P2 and U, selecting the higher-pressure source and sealing with NBR. Given this description: - Intended fluid: The valve is specified for hydraulic oil. Its materials (galvanized steel body and valve) and NBR seals are compatible with typical mineral-based hydraulic oils. - Viscosity handling: The device will handle the normal viscosity range of standard hydraulic oils used within the stated operating temperature range (-20Â°C to +100Â°C). Very high-viscosity fluids at low temperatures (near -20Â°C) may slow response or affect flow; very low-viscosity fluids at high temperatures may change leakage characteristics. No specific viscosity limits are provided, so assume typical hydraulic oil grades only. - Other fluids: Use with fluids other than hydraulic oil is not recommended without verification. NBR seals are vulnerable to swelling or degradation with certain synthetic fluids (e.g., some phosphate esters, glycol-based fluids, certain aggressive solvents) and with fuels or strong chemicals. Galvanized steel may also corrode with incompatible fluids. Recommendation: Use Circulation switch, type VSF only with hydraulic oils compatible with NBR and galvanized steel. For alternative fluids or nonstandard viscosities, consult the manufacturer for compatibility data and specified viscosity/pressure ranges before use.

Circulation switch, type VSF

All products, Other high-pressure valves/

Additional information

Material	CS – steel (cast iron)

The VSF valve supplies hydraulic oil from the connection P1 or P2 to the connection U. The power source is the connection with higher oil pressure (the second connection P1 or P2 is automatically blocked using a movable ball). The valves are equipped with mounting holes. Material: galvanized steel (body), galvanized steel (valve). Sealing: NBR. Operating temperature: from -20°C to +100°C.

List of product variants

Article number	Product variant name	DN	BAR	Availability	Actions
DC-VSF-04	VSF circulation switch, GW 1/4" BSP	-	500	In stock	Enquiry
DC-VSF-06	VSF circulation switch, GW 3/8" BSP	-	500	In stock	Enquiry
DC-VSF-08	VSF circulation switch, GW 1/2" BSP	-	500	In stock	Enquiry
DC-VSF-12	VSF circulation switch, GW 3/4" BSP	-	350	In stock	Enquiry
DC-VSF-16	VSF circulation switch, GW 1" BSP	-	350	In stock	Enquiry

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The VSF valve supplies hydraulic oil from the connection P1 or P2 to the connection U. The power source is the connection with higher oil pressure (the second connection P1 or P2 is automatically blocked using a movable ball). The valves are equipped with mounting holes. Material: galvanized steel (body), galvanized steel (valve). Sealing: NBR. Operating temperature: from -20°C to +100°C.