Hydac DV20 Needle Valves
Hydac
产品编号: DV20
Artikelnummer: Art.Nr. 505101705060
生产厂家: Hydac
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Datasheets for Hydac DV20 Needle Valves
Description for Hydac DV20 Needle Valves
Needle Valves with and without Reverse Flow Check Direct-Acting Inline Mounted - 350 bar DV- / DRV- 06 to 16· For regulating the speed of loads · For fine adjustment and shut-off of the flow · For system-related damping in hydraulic circuits · To release pressure from accumulator systems · As an emergency drain for lowering a load without a dead man's circuit · Spindle secured before complete loosening · An Allen set-screw locks the setting of the knob · Choice of five sizes ensures best possible adaptability to the system · Drop forged housings with high safety factor Operating pressure: max. 350 bar Nominal flow: DV- / DRV-06 max. 20 l/min DV- / DRV-08 max. 50 l/min DV- / DRV-10 max. 60 l/min DV- / DRV-12 max. 90 l/min DV- / DRV-16 max. 180 l/min Cracking pressure (DRV): 0.5 bar Media operating temperature range: min. -20 °C to max. +100 °C Ambient temperature range: min. -20 °C to max. +100 °C Operating fluid: Hydraulic oil to DIN 51524 Part 1, 2 and 3 Viscosity range: min. 2.8 mm²/s to max. 800 mm²/s Filtration: Class 21/19/16 according to ISO 4406 or cleaner Installation: no orientation restrictions, preferably horizontal Materials: Valve body: steel Piston: hardened and ground steel Seals: FKM (standard) Back-up rings: PTFE Weight: DV-06 = 0.10 kg DRV-06 = 0.10 kg DV-08 = 0.26 kg DRV-08 = 0.28 kg DV-10 = 0.38 kg DRV-10 = 0.41 kg DV-12 = 0.62 kg DRV-12 = 0.65 kg DV-16 = 1.04 kg DRV-16 = 1.14 kgThe DV is an inline mounted flow control valve which controls the flow by adjusting the cross-section. The flow rate is therefore dependent on the pressure differential and viscosity. Starting with the throttle spindle in the fully closed position, the flow rate increases in accordance with the appropriate curve as the control knob is turned. The flow is controlled in both directions. The scale on the lower edge of the control knob enables accurate repeat setting. The DRV is a flow control valve in the same design which also allows the same fine flow adjustment, but in one direction only. Unrestricted flow in the reverse direction is via the built-in check valve (cracking pressure 0.5 bar).
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