VARIVENT® SHUT-OFF VALVES

• Certified, hygienic configuration
• Metallic stop
• Flexibility because of the modular principle
• Proven seal geometry

To avoid water hammers when closing the valve while the product is flowing, single-seat shut-off valves should be switched against the flow direction of the product.

Valve type N is designed for a flow from the lower to the upper pipeline, whereas valve type U is for the opposite flow direction

In practical use, these valves are used

• as emptying / drainage valves
• for shutting off a bypass line
• as dosing valves

VARIVENT® long-stroke valves are used for transporting fluids with relatively large particles or for viscous products, such as yoghurt with pieces of fruit.

Valve Selection Scheme:  Feature: Type
1.From bottom to top:    Modular system:  Single-seat valve, type N       
2.From bottom to top:      Long-stroke valves for viscous products or products with large particles : Single-seat long-stroke valve,type N_V                                                        
3.From top to bottom:Modular system :Single-seat valve, type U 
4.From top to bottom: With optimized maintenance, radial sealing:Single-seat valve, type U_R             
5.From top to bottom:Long-stroke valves for viscous products or products with large particles: Single-seat long-stroke valve,
type U_V              

The structure of the VARIVENT® modular system has many optional versions available to best optimize the valve in the process. Please refer to the options section in the catalog for information about these.

Sizes

Single-seat shut-off valves  : Long-stroke shut-off valves
DN 25 – DN 150: DN 65 – DN 100
OD 1″ – OD 6″:       OD 2 ½” – OD 4″
IPS 2″ – IPS 6″:

Type N, N_V & U, U_V, U_R
Please refer to the catalog for information.

Type N

Recommended flow direction:From bottom to top
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:DN, OD, Ra ≤ 0.8 µm, IPS, Ra ≤ 1.2 µm
External housing surface:Matte blasted
Control and feedback system:T.VIS® control top
Actuator type:Pneumatic actuator air / spring
Connection fittings:Welding end
Identification:Adhesive ID tag
Valve seat version:Clamped or welded seat ring
Certificates:EHEDG, 3A, CE

Type N_V (longstroke)

Air supply pressure:4.8 bar (70 psi)
Product pressure:DN 65 – DN 80 OD 2 ½” – OD 3″ 10 bar (145 psi) DN 100 & OD4″5.2 bar (75 psi)
Surface in contact with the product:Ra ≤ 0.8 µm
Valve seat version:Clamped or welded seat ring

Type U

Air supply pressure:6 bar (87 psi)
Product pressure:5 bar (73 psi)
Surface in contact with the product:DN, OD, Ra ≤ 0.8 µm, IPS, Ra ≤ 1.2 µm
Valve seat version:Welded seat ring
Certificates:3A, CE

Type U_R (radial)

Air supply pressure:6 bar (87 psi)
Product pressure:5 bar (73 psi)
Surface in contact with the product:Ra ≤ 0.8 µm
Valve seat version:Clamped or welded seat ring

Type U_V (longstroke)

Air supply pressure:4.8 bar (70 psi)
Product pressure:DN 80OD 3″5 bar (73 psi)DN 100 & OD 4″5.6 bar (81 psi)
Surface in contact with the product:Ra ≤ 0.8 µm