icon-Check Valves


Proven design

The proven design of the RZN is the basis for RZI valves, which can be installed in large-diameter or high-pressure pipelines and are equipped with a multirate, adjustable, interval-damping system for particularly critical applications.

The RZI provides adjustment for each damping rate and also timing-of-rate increase during check valve closure.This means, the RZI can be tuned to precisely match the closing characteristics required by a pump installation to avert excessive pressure surge.

- non-return valve with multirate adjustable interval damping system
- resilient seal or laminated metal-to-metal seal
- triple offset design with inclined conical sealing system

- three adjustable independent damping rates
- auto-closing
- damper adjustment locking

- controlled, non-slam closure
- adjustable closing characteristic
- additional screw safety device

- prepared for retro-fitting of counterweights, if flow conditions change
- longevity, even for frequent cycle operation

Nominal Diameters:
500 mm / 20 inches to 3000 mm / 120 inches

Temperature Range:
-50°C / -58°F to +200°C / +392°F

Pressure Class:
PN 2,5/6/10/16/25/40 ANSI 150/30

- damping system for opening
- pneumatic or hydraulic power pack for positive operation
- disc locking device, mansafe design

- additional counterweight
- vulcanized hard rubber coating
- butt weld ends