Designation Of Threaded Connections; Threaded Connection Rp (Example Rp 1/2); Threaded Connection G (Example G 1/2) - Johnson Pump SPXFLOW TopGear BLOC Series Instruction Manual

Another method to adjust axial clearance by using a magnet stand and a dial guage.
1. Disassemble motor from lantern piece
2. Loosen the tap bolts (2290a) on the pump
casing side
3. Tighten the tap bolts (2290b) on the motor
side until the pump shaft with rotor and
bearing is pushed completely against the
pump cover, the axial clearance "S
then 0.
4. Place the megnet stand on lantern piece
and the dial gauge plunger on coupling
bush and initialise the dial guage.
5. Loosen the tap bolts (2290b) and tighten the
tap bolts (2290a) equally until the needle of
the dial guage registers a little more (0.02mm)
than the desired clearance.
6. Fix the ball bearing by tightening the tab bolts (2290b) until the needle of the dial guage falls
back on to the desired clearance.

3.20.7 Designation of threaded connections.

To make clear what sealing type of threaded connection is provided we denominate them according to
standards ISO 7/1 and ISO 228/1 as follows.

3.20.7.1 Threaded connection Rp (example Rp 1/2)

If no flattened sealing face is provided we call the connection Rp accordingly ISO 7/1. This
connection has to be sealed in the thread. The plugs or pipe connections must be provided with
conical thread according to ISO 7/1 external thread (example ISO 7/1 – R1/2).
Conical plug
ISO 7/1 - R1/2

3.20.7.2 Threaded connection G (example G 1/2)

If the threaded connection is provided of a flattened sealing face we call it G according ISO 228/1.
This connection can be sealed by a gasket. The plugs or pipe connections must be provided with a
sealing collar and cylindrical external thread according to ISO 228/1 (Example ISO 228/1 - G1/2).
Plugs or pipe connections provided with conical thread according to ISO 7/1 external thread
(example ISO 7/1 – R1/2) can also be used.
Plug with collar
ISO 228/1 - G1/2
A.0500.751 – IM-TGBLOC/01.00 EN (10/2020)
" is
ax
Conical pipe end
ISO 7/1 - R1/2
ISO 7/1
Internal
thread
External
thread
Conical pipe end
ISO 7/1 - R1/2
Type
Cynlindrical (parallel)
Always conical
(tappered)
ISO 228/1 Clearance class
Internal
Only one class
thread
Class A
(standard)
External
thread
Class B
(extra clearance)
ISO 7/1 Type
External Always conical
thread (tappered)
Symbol Example
Rp ISO 7/1 – Rp 1/2
R ISO 7/1 – R 1/2
Symbol Example
G ISO 228/1 – G 1/2
G ISO 228/1 – G 1/2
G...B ISO 228/1 – G 1/2 B
Symbol Example
R ISO 7/1 – R 1/2
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