Non-return valves

The non-return valve is the heart of the plasticizing unit.

Non-return valves must shut off safely and should allow a constant mass cushion, in order to guarantee reliable and even dosing.

There are no good or bad non-return valves, but only suitable and unsuitable ones as far as manufacturing quality is concerned.

Non-return valves by Groche aim to achieve minimal wear and a long service life.

We guarantee

  • Agreed product solutions
  • Short delivery times
  • Reliable service

3-part screw-tip-set
The three part standard
screw-tip-set.
A good compromise.
2-wing screw-tip-set
The 2-wing screw-tip-set has a big
throughput diameter for fast dosing.
VKS screw-tip-set
Shuts off quickly and has little wear
because of its specialised geometry.
Central ball screw-tip-set type I
The ball screw-tip-set shuts off
more evenly but reduce the
flow-cross-section. Suitable for plastics
with low viscosity.
Central ball screw-tip-set type II
The ball screw-tip-set shuts off
more evenly but reduce the
flow-cross-section. Suitable for plastics
with low viscosity.
Conical screw-tip-set
Diagonal ball screw-tip-set type III
Multiple ball screw-tip-set
Thermoset screw-tip-set
Minimises the risk of breakage
for thermoset and other highly
viscous plastics.
Lawson screw-tip-set
The Lawson screw-tip-set has a
large cross-section with a locked
valve ring for fast dosing.
Castle screw-tip-set
The claws of this screw-tip-set guarantee a precise injection.
PVC screw tip
The PVC tip with flight profile.
PVC tip
PVC tip smooth.