Multiquip MG30M2D - Manual (Page 26)

PAGE 26 — MAYCO MG-30 PUMP — OPERATION AND PARTS MANUAL — REV. #3 (09/15/11)
MG-30 PUMP — APPLICATION
Anytime it is necessary to uncouple or remove any part of
the delivery system, the manual pressure release plug must
be opened to relieve pressure in the system.
Pressure Relief Plug (Manual Operation)
Purpose
To provide the capability that will manually release the pressure
in a material hose or line whenever the flow of material is restricted
for any reason, causing unsafe pressure to build up in the hose
or line.
Safety Valve Placement (Manual)
Place the safety relief pressure valve (Figure 9) at the
discharge side of the plaster pump, ahead of the hose connection.
Located on the pressure relief valve is a
rubber pressure
release plug (manual activation), the plug is held in position by
a steel clamp ( yoke ) and is activated by pulling the lever
downward to release the pressure in the system.
This manual pressure release plug is to be used in conjunction
with the automatic release mechanism (
rubber check ball ).
ALWAYS open the manual pressure
release plug before disconnecting
any part of the delivery hose, line or
clamp system.
NOTE
Before activating the manual pressure release plug the operator
must do the following:
1. Stop the engine.
2. Warn all workers and bystanders to stand at least 20 feet
away from the pump and turn their heads away from the
pressure relief safety valve.
3. The operator shall position himself/herself beside the
pressure relief safety valve with his/hers back to the
pump.
4. Wearing safety glasses, reach down with one hand, grasp
the release lever on top of the safety valve.
5. Turn head away from the pressure release plug and lift lever
upwards ( open) .
6. Remain facing away from the pressure relief valve until
counting up to 20, slowly. By that time, the material ejecting
under pressure will be slowly discharging. Work can resume
only after the material has been discharged for a minimum
of 20 seconds.
7. After correcting the problem that caused the excess pressure
in the system line, close the safety plug by pushing the plug
open/close lever
downward ( closed), and resume pump-
ing.
Figure 9. Rubber Safety Relief Pressure Plug