11
Handling Precautions for screw piping
! Caution
(1) Tighten the screws with an appropriate spanner, using the hexagonal face of the S coupler.
Position the spanner as close to the thread as possible. Do not apply pliers or pipe wrench to any
parts other than the spanner flats. This may cause damage to the product and/or leakage.
(2) Tightening Method
First, tighten the fitting by hand, then use a wrench appropriate for the hexagon flats of the
body to tighten it a further two or three turns.
For a tightening torque guide, see the table below.
(3) If the product is screwed in with excessive torque, a large amount of sealant will seep out.
Remove the excess sealant.
(4) Insufficient tightening may cause sealing failure or a loose connection.
(5) Reuse
1) Normally, the fittings with sealant can be reused 2 to 3 times.
2) Remove loose sealant that is stuck to the fitting by blowing air over the threaded portion of the
fitting before reusing. If the loose sealant enters adjacent machinery, it may cause air leakage or
malfunction.
3) When the sealant loses its sealing effect, re-wrap sealant tape over the thread before using.
Use sealant tape only, do not use other types of sealant.
(6) When positioning is required, loosening the piping after it is once tightened may cause air leakage.
Thread size
Tightening torque (Nm)
NPT, R1/8
3 to 5
NPT, R1/4
8 to 12
NPT, R3/8
15 to 20
NPT, R1/2
20 to 25
NPT, R3/4
28 to 30
NPT, R1
36 to 38
NPT, R1 1/4
40 to 42
NPT, R1 1/2
48 to 50
2020-11-16 13:19
DP937237
2020-11-17 09:25
DP937237
