Leser 526 API - Section 9.15: Adjusting the Set Pressure (Final Check); Section 9.16: Testing Seal Tightness of Back Seal P21; Section 9.17: Sealing the Valve

LESER Global Standard
Assembly instructions for type 526 API
LGS 4104
Page 45/45
disclosure cat.:
II
proofread:
SSt
published date:
06/14/18
effect. date:
05/18
author:
Nieh
released by:
KUW
replaces:
initial
status:
Published
resp. depart.:
IE
date of release:
06/14/18
revision No.:
2
doc. type:
LGS
change rep. No.:
NA
retention period:
10
protected
9.15 Adjusting the set pressure
Pressurise the valve as per the workplace description.
Check whether the valve opens at the set pressure. The set pressure of the valve
has been reached when the pressure display remains constant when the line
pressure increases. It must fully open.
The valve must open within the tolerance range 3 times in succession.
Document the set pressure.
9.16 Testing the seal tightness of the back seal P21 (seal tightness to the outside)
This test is performed for every gas-tight valve after its assembly.
9.17 Sealing the valve
Illustration
Description
Aids / Tools
Figure 9.17-1
If structurally possible (sealing
hole/lug on cap/lever and bonnet
exist), then seal the valve. Otherwise
sealing lugs must be welded on.
Closely connect the sealing hole or
lug from the cap/lever and bonnet in
a clockwise direction, and connect
the locking screw and sealing lug
with sealing wire and seal the ends
of the wire with a lead seal.
If classification approvals (TÜV etc.)
are required, then seal afterwards.
Sealing pliers
Wire twisting
pliers
Sealing block
Wire