APTech AZ4657 - Manual (Page 4)

Operation Manual Manual Diaphragm Valves
Manual 15000004 Revision 7 Page 4 of 4
F. Lock Out Tag Out Valves
1. AP3157, AK/AP/AZ3657, AK/AP/AZ4657, and AP3900 valves have a built in lock out tag
out (LOTO) capability. A non-interlocking scissor type padlockable safety lockout hasp with
a 1/8 inch or thinner hasp arm thickness is required to use this feature. A Master Lock
®
No.
420 safety lockout hasp is suggested.
2. If the lock out tag out feature is to be used, verify that the lock stem center piece slot
clearances are compatible with the available safety hasp as follows.
a. Turn the knob fully clockwise to close the valve. Verify that the lockout hasp can be
inserted through the lock stem slot and closed. Remove the hasp.
b. Lift up on the knob and turn fully counter-clockwise to open the valve. Verify that the
lockout hasp cannot be inserted through the lock stem slot.
3. The valves can be locked out as follows.
a. Turn the handle fully clockwise to close the valve. Insert an arm of the safety lockout
hasp through the slot in the lock stem located on top of the valve. Close the safety lockout
hasp and insert a padlock through one of the padlock holes in the safety lockout hasp.
Please contact the factory or your local representative to answer questions or for further
information.