Dispense Valves Overview - Graco HFR Setup And Operation Manual

Dispense Valves Overview

Three types of dispense valves can be used with the
HFR system:
• Stall-at-pressure
• Solenoid controlled
• Hydraulically actuated and recirculating
The P2 Gun and Fusion Gun are examples of
stall-at-pressure dispense valves. When not dispensing,
the fluid in the chemical lines are fully pressurized.
When using a stall-to-pressure dispense valve, a
footswitch cannot be used. Any signals sent from a
footswitch will be ignored.
The EP Gun and MD2 Valve are examples of solenoid
controlled dispense valves. When the trigger is pulled
the signal requests the dispense to start. When the
machine sees the signal, fluid rises to dispensing pres
sure and the valve is opened to begin dispensing. When
the trigger is released, the solenoid signals that the dis
pense is finished.
The L-Head, S-Head, and GX-16 are examples of
hydraulically actuated, recirculating dispense valves.
When not dispensing, material is recirculated to main
tain temperature and pressure. Opening and closing the
valve is controlled hydraulically which leads to faster
actuation and more accurate dispenses.
313997ZAA
Dispense Valves Overview
37