280 Series Stainless Steel Rotary Direction Control Valve
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280 Series Stainless Steel Rotary Direction Control Valve For hydraulics in a harsh environment. The 280 Series is a high pressure, 316 stainless steel, hydraulic rotary direction control valve. It is the ideal solution for control of hydraulic actuators used in arduous environments where internal leakage must be minimised. The valves utilise an optically flat rotary spool with pressure loaded seats, to ensure either zero or near zero leakage (depending on flow size). The 280 Series valve is compatible with water glycol hydraulic fluid. Specifications Maximum Pressure: Up to 700 bar, 10,000 psi Maximum Flow: Up to 38 Ipm, 10 US gpm Ambient Temperature: -20 to 50°C, -4 to 122°F Media Temperature: -30 to 120°C, -22 to 248°F Porting: Side ported BSPP, NPTF, or SAE Manifold ported 014 O’ ring on pitch circle diameter (PCD) Material: Steel components in 316 Stainless Steel body. Nitrile rubber (NBR) Seals. Weight: Typically 3.2 kg, 7lbs Mounting: Standard - 4 x 5/16” UNC holes to fasten screws into valve base Panel - 4 x 5/16” UNC studs to fasten valve into panel Manifold - 4 x 5/16” UNC through bolts to fasten valve onto manifold Symbol: e.g 283 Milwaukee, WI 53235, USA Tel: +1 (414) 769-6400 sales-us@webtec.com St. Ives, Cambs. PE27 3LZ, UK Tel: +44 (0) 1480 397 400 sales-uk@webtec.com www.webtec.com Features • Over 4000 possible configurations • 3 position / 2 position • 4 port / 3 port • Zero leakage (15 lpm, 4 US gpm version) • Standard documentation:-• Manual • Certificate of Conformity • Performance test Certificate • Declaration of Conformity to ‘ATEX’ • BS EN13463-1:2009 (ATEX) rating of ‘II 3G TX’ • BS ISO 4401-03, NFPA T3.5.1-D03 (CETOP3/ NG06/D03) mounting adapter • Express build available (single unit orders) • Pressurised tank port with additional drain available

Ordering Codes Typical Code 282 - E 2 F - 3X 4Y A Valve Model (Table 1) Porting (Table 2) Flow Size (Table 3) Valve Options (Table 4) Position Type (Table 5) Port Type (Table 6) Non-Standard Options (Table 7)

Leakage between flow paths. Closure tests with low pressure air (82 psi) were conducted on Webtec’s 280 Series of rotary directional control valves. Flow size 0 with non-interflow was found to have no visually detectable leakage for the duration of the test (60 seconds). Flow sizes 1 & 2 with interflow were found to have a leakage of 1.67x10-4 lpm which equates to less than 1 drop of water every 10 minutes. Note: The performance of the valve in terms of leakage across paths is adversely affected by a reduction in fluid viscosity Interflow Interflow is a transient effect that occurs on flow...

Installation Details Dimensions in millimetres (Inches) SAE / NPTF / BSPP (order codes L, E, F, T) with standard mount & straight handle 014 O’ ring (order code A) with panel mount & bent handle Centre Position 35.0 (1.38”) See Standard / Panel mount template Bent Handle 4 Panel mount studs. 5/16”-18UNC-2A x 14.2 (0.56”). 4 x side ports (SAE, NPTF, or BSPP) 4 x counter bores supplied with BS ISO3601, AS568A 014 O’ rings (NBR) B 4 x 5/16”-18UNC x 11mm (0.43”) deep mounting holes 4 x Standard mount holes 5/16”-18 UNC-2B x 11mm (0.43”) deep See Standard / Panel mount template

Installation Details Dimensions in millimetres (Inches) 014 O’ ring Manifold mount (order code C) Some dismantling & re-assembly is required for installation. See supplied instruction leaflet. Some dismantling & re-assembly is required for installation. See 014 O’ ring manifold mount installation details below. 014 O’ ring manifold mount with 280-CETOP3 / D03 Kit Supplied with 4 x 5/16”-18UNC through bolts, washers, & nuts. 4 x counter-bores with supplied BS ISO 3601, AS568A -014 O’ rings (NBR) 4 x counter-bores with supplied BS ISO 3601, AS568A -011 O’ rings (NBR) 014 O’ ring Manifold...

Non-Standard Options (order code table 7) Option A - tank port pressurised with additional drain Port T can now be used at full system working pressure (depending on flow size). Maximum tank line pressure (17 bar, 250 psi) now applies to the drain port. The drain port must not be plugged. Side View 1/8” NPTF drain. This side (port B) only. Updated hydraulic symbols for valve with pressurised tank port & 180 additional drain 181 Webtec reserve the right to make improvements and changes to the specification without notice