AIA/NAS 944-2012 pdf download SYMBOLS, HYDRAULIC TEST EQUIPMENT DRAFTING
DIRECTION OF FLOW，ONE WAY
DIRECTION OF FLOW，BOTH WAYS
SELECTOR VALVE， OPEN CENTER，FOUR WAY (SHOWN IN NEUTRAL，HANDLEROTATION 45° FROM NEUTRAL，EITHERDIRECTION)
SELECTOR VALVE，CLOSED CENTERFOUR WAY (SHOWN IN NEUTRAL，HANDLEROTATION 450 FROM NEUTRAL， EITHERDIRECTION)
SHUT OFF VALVE，MANUAL LEVER TYPE(SHOWN CLOSED，HANDLE ROTATION 90)
SELECTOR VALVE，SPOOL TYPE，MANUALCLOSED CENTER，THREE POSITION，(SHOWN IN NEUTRAL)
SELECTOR VALVE，SPOOL TYPE，MANUALOPEN CENTER，THREE POSITION,(SHOWN IN NEUTRAL)