AVAILABLE IN NPT AND SAE PROVIDE PRECISE CONTROL OF FLOW AND SHUTOFF IN ONE DIRECTION, AND AUTOMATICALLY PERMIT FULL FLOW IN THE OPPOSITE DIRECTION. A TWO-STEP NEEDLE ALLOWS FINE ADJUSTMENT AT LOW FLOW BY USING THE FIRST THREE TURNS OF THE ADJUSTING KNOB; THE NEXT THREE TURNS OPEN THE VALVE TO FULL FLOW, AND ALSO PROVIDE STANDARD THROTTLING ADJUSTMENTS THE EXCLUSIVE “COLORFLOW” COLOR-BAND REFERENCE SCALE ON THE VALVE STEM IS A GREAT CONVENIENCE AND TIME-SAVER IN SETTING THE VALVE ORIGINALLY AND IN RETURNING IT TO ANY PREVIOUS SETTING. CRACKING PRESSURE, FOR RETURN CHECK POPPET: 5 PSI (0.4 BAR) POPPET MATERIAL: BRASS VALVES (B SUFFIX):SOFT SEAL STEEL VALVES (S SUFFIX): SOLID METAL POPPET MAXIMUM OPERATING PRESSURE: BRASS: MODELS F, INLINE ONLY: 2000 PSI (140 BAR) STEEL: 400-800 SIZES: 5000 PSI; 1200 SIZES: 3000 PSI