Magnum Venus Plastech Flex Molding Process PPVS - VACUUM SENSOR - Manual (Page 16)

PPVS (Red) Vacuum Sensor Manual
Rev. 03/2013 Page | 16
Introduction:
The PPVS (Pneumatic Pressure Vacuum Sensor) is a control valve to sense vacuum
levels in a Lite RTM or Vacuum infusion process and turns On & Off the Injection
machine as desired. The PPVS fits into the MVP Universal Insert port. It is normally
factory set at 800mb absolute.
In operation the PPVS will leak the MPG pressure causing the Injection Machine to
slowdown or turn Off when the mold cavity vacuum pressure is below (closer to
positive) then the set point pressure. The PPVS is connected into the MPG circuit using
a 6mm tube and like the MPG when the PPVS senses the pressure in the mold is too
low it leaks the MPG signal air. The PPVS should be located 300 – 600 mm (12” – 24”)
from the Injection point in the resin feed channel.
The pressure set point of the PPVS is always set below atmospheric pressure to ensure
the injecting resin never increases in sufficient pressure in the mold or to force the
infusion film away from the fiber pack. There is a secondary adjustment for the time
delay of the air leak.
NOTE: It is important to have the correct parts drawing for the item you are
working on. This will assist in identifying the correct part numbers for the
assembly being rebuilt.
Use Red Grease (6706-2-1 1oz) or Magnum Gun Lube (GL-200 2oz) for the O-rings
(3265) on the valve nose.
NOTE: Before starting any service work, release fluid and air pressure from
system.
Please read the manual carefully. Follow the steps in the order given, otherwise you
may damage the equipment or injure yourself.
During Disassembly . . .
As you disassemble the equipment, lay out the components in the correct order and
direction, and have all component drawings available to refer to prior to disassembly.