Tri-Clamp Sanitary Shut-Off Valves

  • $764.00


PAZZINI 900 SERIES

Application:

The single seat shut-off valve is a hygienic pneumatically operated valve with a wide range of applications in the food, beverage, and pharmaceutical processing industry.


Features:

• Made in SS316L / wetted surfaces
• Few moving parts, contributing to high reliability and low maintenance.
• Easy cleaning
• Seat gasket replacement in less than 10 minutes without removing the valve from the line and no tools required.
• Repairable actuator

Materials:

 • Product wetted steel parts: AISI 316L (internal Ra < 0.8 μm)
 • Other parts in stainless Steel: AISI 304
 • Plug gasket: EPDM
 • Other product wetted seals EPDM (standard)

Technical specifications:
 • Max working pressure: 145 psi (10 bar)
 • Min. working pressure: Full vacuum
 • Working temperature: Please see below information.

 


 Spare parts

 Working Principle:
Seat valves are operated by a single-acting, double-acting pneumatic actuator or manual handle. The compressed air is applied to the actuator and the shaft is moved to place the valve in the "open" or "closed" position.
Recommended Inlet:

The seat valves are designed to close against the flow. 

Slow-closing or slow-opening minimizes the water hammer.

Flow Capacity:

The flow coefficient Cv is the volume (in US gallons) of water at 60 °F that will flow per minute through a valve with a pressure drop of 1 psi across the valve. 

 

VALVE SIZE (at 100% open)
CV
1 1/2" 40
2" 84
3" 190

 

 

For other pressure drops than 1 psi the flow can be calculated with the following formula:

Q= Cv x √ ∆p

Where:

Q= Flow in GPM
Cv = Flow coefficient.
∆p = Pressure drop in psi over the valve.

Example:

 1 1/2" valve has a Cv= 40 GPM with a pressure drop of 1 psi.

For a pressure drop of 2 psi which is the flow?

Q= 40 X √2 = 56 GPM.

Fluids other than water, please consult us.

Static seal temperatures

Gasket Properties EPDM VITON
Heat resistant Excellent (275°F) Excellent (400°F)
Cold resistant Good-Excellent (-20°F) Good-Excellent (-30°F)
Steam Good Excellent
Abrasion-resistant Good-Excellent  Good
Alkali Good Poor-Good
Acid resistance Good-Excellent  Good
Vegetable oil Good Excellent
Petroleum oil Poor Excellent
Oxonia Good-Excellent  Excellent
Ozone Good-Excellent 

Excellent

 

Note: The surfaces in contact with a seal determine what type to use. The surface can either be static or dynamic, in motion or without movement. Static seals are usually used when there is no relative motion between mating surfaces. Dynamic seals are the opposite. They are used when there is motion between surfaces or compression loads.  Seal under compression load in combination with high temperatures also affect the properties of elastomers.


Examples: Seat vales (Relief, Shutt-down, Divert and Regulating)

Seat Valves recommended temperatures:

Recommended temperature for short periods of time (15-20 min) EPDM:  260°F, VITON: 285°F
Recommended temperature for short periods of time (15-20 min) EPDM:  260°F, VITON: 285°F

 

Easy Conversion / Integration:

Our standard design allows an easy conversion to a pneumatic operated valve.

Easy Conversion

The 180º rotation of the pneumatic cylinder of the single-acting actuators allows to have a normally open or normally closed valve.