Den-Sin MERMAID E500-S - SV- Safety Valve Operation; UV-Unloader Valve Operation

1. Getting acquainted with your Water Blaster
MERMAID E500-S STD08 Page 6 of 52
High Pressure Machine Schematic Diagram Mermaid E500
Symbol Description Symbol Description
F1
Filter 1
-
Incomming
MP
Main Pump
FV Float Valve UV Unloader
LS Level Sensor PG2 Pressure Gauge High Pressure
SV Safety Valve TG Trigger Gun (Dry Shut Type)
Remarks:
• SV : - SV (Safety Valve) is set at factory about 20~30Bar more than PG 2(Pressure Gauge)
• TG: - TG (Trigger Gun –Dry) is normally close, pressurize when trigger is pressed.
• UV: - UV (Unloader) is normally open, pressurize when trigger is pressed.
SV- Safety Valve Operation
Safety valve is a system to protect the machine from over pressure. Over pressure occurs when
nozzle size is wrong or the nozzle is chocked. Another possible cause is the unloader setting is
wrongly set. When machine is over pressurized, the safety valve will start to open and excess
water is dumped. The setting of the safety valve system is factory set, do not try to reset them.
UV-Unloader Valve Operation
Unloader valve system is a system to regulate the pressure for the machine. The setting of the
unloader valve system is factory set. Do not try to reset the setting. There should about 5% water
dump back into the water tank if the nozzle is use correctly
MP
F
Water
IN
80L
Water Tank
FV
LS
F 1
SV
Signal Out
Dump Back
UV
PG 2
TG 1
CAUTION
Machine is manufactured with factory preset settings for its Unloader and
Safety valves. Please do not try to change these setting. Adjusting the
setting will affect the machine performance or machine become unstable.
A trained personal is required to change the settings if necessary.