VARIVENT® MIXPROOF SHUT-OFF VALVES FOR CIP & GAS BLOCKS

When the valve is closed (non-actuated position), there are always two seals between the separated pipelines. If one seal is defective, the resulting leakage will be directed through the leakage outlet into the periphery, without mixing with the product in the second pipeline.

VARIVENT® double-seal valves type C and double-seat valves type K are predominantly used in areas where hygienic is not critical, e.g. CIP systems and gas blocks (brewery)

Valve type K represents a typical double-seat valve with two independent valve discs in which these two seals are located.

Valve type C, on the other hand, is a double-seal valve in which these two seals are together with the leakage chamber in between them in a valve disc.

In both versions, two seals prevent any mixture between a product line and a line carrying a cleaning media.

Double-seal valves, type C valves: Double-seat valves, type K

DN 25 – DN 150: DN 25 – DN 150

OD 1″ – OD 6″: OD 1″ – OD 6″

—: IPS 2″ – IPS 6″

Application — Sealing

Product Range:Axial Sealing (Switching Leakages)
Product Range:Axial Sealing (Switching Leakages)
Product Range:Radial Sealing
Product Range:Axial Sealing (Switching Leakages)
Product Range, piggable:Radial Sealing
Product Range, piggable:Radial Sealing
Gas Blocks &:
CIP Systems:
Gas Blocks &:
CIP Systems:

Application — Feature

Product Range:Modular System
Product Range:With Water Hammer Safety
Product Range:With Water Hammer Safety
Product Range:Viscous Products or Products with large Particles
Product Range, piggable:Pigging Pipe
Top
Product Range, piggable:Pigging Pipe Bottom
Gas Blocks &CIP Systems:Modular System
Gas Blocks &CIP Systems:Modular System

Application — Type

Product Range:Double-seat Valve, Type D
Product Range:Double-seat Valve with Balancer, Type B
Product Range:Radial Sealing Double-seat Valve, Type R
Product Range:Double-seat Long-stroke Valve, Type D_/V
Product Range, piggable:Piggable Double-seat Valve Upside Down, Type L_H
Product Range, piggable:Piggable Double-seat Valve Upright, Type L_S
Gas Blocks &CIP Systems:Double-seal Valve, Type C
Gas Blocks &CIP Systems:Double-seat Valve, Type K

Cleaning the Leakage Chamber

Double-seal valve type C

In the standard version, two flushing valves are connected to the leakage chamber between the two valve disc seals.

One flushing valve is always used for the leakage outlet, while the second flushing valve is in contact with cleaning media through an olive screw fitting, in order to clean the leakage chamber.

In this case, it is necessary to have a supply valve connected in the periphery to supply the flushing valve with cleaning media at the required time.

Cleaning takes place while the main valve is closed, which means the seal surfaces of the valve disc seals that are in contact are not reached.

Double-seat valve type K

The double-seat valve type K does have neither an external spraying connection nor a lifting actuator. The leakage chamber is flushed by the fluid that emerges from the leakage chamber as a result of the switching leakage during the main stroke.

For this reason, the valve is not suitable for use in hygienic areas.

The advantages of the valve type K are its slightly increased safety against water hammers that could occur in the lower pipeline, as well as having a wider selection of available housing combinations.

Type C

Material in contact with the product:1.4404 / AISI 316 L
Material not in contact with the product:1.4301 / AISI 304
Seal material in contact with the product:EPDM, FKM, HNBR
Ambient temperature:0 to 45 °C
Air supply pressure:6 bar (87 psi)
Product pressure:5 bar (73 psi)
Surface in contact with the product:Ra ≤ 0.8 μm
External housing surface:Matte blasted
Control and feedback system:Connection 0 (without control top)
Actuator type:Pneumatic actuator air / spring
Connection fittings:Welding end
Identification:Adhesive ID tag
Valve seat version:Fixed vertical port
Certificates:EHEDG, CE

Type K

Surface in contact with the product:DN, OD Ra ≤ 0.8 µm IPS Ra ≤ 1.2 µm
Valve seat version:Clamped or welded seat ring
Certificates:A3, CE