Tri-Clamp Sanitary Shut-Off Valves
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
• 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:
.
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.