DVS series
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Proportional Pressure-Relief Cartridge Valve, Size 1 Qmax = 1.5 l/min, pmax = 420 bar Pilot valve, seated design, direct acting Series DVSA-1L… S Can be used as a pilot valve S Compact construction for cavity type AL – 3/4-16 UNF S Operated by a proportional solenoid S In a power failure, the pressure setting drops to the minimum value S 5 pressure ranges available S All external parts zinc plated, chromited (CrVI-free) S High pressure wet-armature solenoids S The slip-on coil can be rotated, and it can be replaced without opening the hydraulic envelope S Various plug-connector systems and voltages are available S Can be fitted in a line-mounting body These proportional pressure-relief cartridges, series DVSA-1L…, are size 1 pilot valves featuring a seat-valve design and a 3/4-16 UNF mounting thread. With these pres­ sure-relief cartridges, the relief pressure is dependent on the electrical control signal and can be continuously varied. When the solenoid is de-energised (initial position), con­ nection 2 → 1 is open and the minimum pressure (free flow) depends on the flow rate. Any pressure at port 1 is additive to the valve setting at port 2, therefore port 1 should prefera­ bly be connected directly to tank. In control mode, the relief pressure is proportional to the change in the required value (amplifier output current). In order to obtain precise pres­ sure settings over the whole of the required pressure range (optimum resolution), the pressure relief cartridges are available in five pressure levels. These proportional pres­ sure-relief cartridges are primarily used as pilot valves, mainly in mobile and industrial applications to allow a pres­ sure in hydraulic installations to be limited electro-propor­ tionally. All external parts of the cartridge are zinc plated and chromited (CrVI-free) and are thus suitable for use in the harshest operating environments. The slip-on coils can be replaced without opening the hydraulic envelope and can be positioned at any angle through 360°. If you intend to manufacture your own cavities or are designing a linemounting installation, please refer to the section “Related data sheets”. Technical data General characteristics Description, value, unit proportional pressure-relief cartridge valve pilot valve, seated design, direct acting Mounting method Tightening torque nominal size 1, cavity type AL

General characteristics Description, value, unit Mounting attitude unrestricted (preferably vertical, coil down) Ambient temperature range Hydraulic characteristics Description, value, unit Maximum operating pressure - main port 2 - port 1 Maximum flow rate Nominal pressure ranges Flow direction Hydraulic fluid HL and HLP mineral oil to DIN 51 524; for other fluids, please consult BUCHER Hydraulic fluid temperature range Viscosity range Minimum fluid cleanliness Cleanliness class to ISO 4406 : 1999 ATTENTION! 1) To prevent any pressure surges, port 1 must be routed to tank with the least...

Performance graphs measured with oil viscosity 33 mm2/s (cSt) p = f (I) Pressure-adjustment characteristic (at Q = 0.3 l/min) p = f (I) Pressure-adjustment characteristic (at Q = 0.3 l/min) Pressure v. Flow rate characteristic pN = 40 bar Pressure v. Flow rate characteristic pN = 100 bar Pressure v. Flow rate characteristic pN = 160 bar Pressure v. Flow rate characteristic pN = 250 bar Pressure v. Flow rate characteristic pN = 350 bar

Dimensions & sectional view 2 Installation information IMPORTANT! To achieve the proportional pressure-relief car­ tridge's maximum performance rating, fit the sole­ noid coil as shown (with the plug pins at the bot­ tom). When fitting the cartridges, note the moun­ ting attitude (preferably vertical, with coil down → automatic air bleed) and use the specified tighte­ ning torque. No adjustments are necessary, since the cartridges are set in the factory. ATTENTION! To prevent any pressure surges, port 1 must be routed to tank with the least possible back-pres­ sure. Any tank pressure acting...

= pressure-relief cartridge, pilot valve = standard solenoid (proportional) A ... Q = standard model - see relevant data sheets Z ... R = special features - please consult BUCHER 1 = pressure function 1 (pressure-relief) = nominal size 1 (primarily for pilot controls) pressure range …350 bar pressure range …250 bar pressure range …160 bar pressure range …100 bar pressure range … 40 bar (blank) = NBR (Nitrile) seals (standard) V = FKM (Viton) seals (special seals - please consult BUCHER) 1 ... 9 = design stage (omit when ordering new units) (blank) = ISO 4400 / DIN 43 650 mating plug...