Habonim Catalog Interactive 2024 V04 15022024 - Catalog - Page 218
CONTROL VALVES
Less stem seal wear
The Habonim quarter-turn ball valve operation is far less prone to leakage due to resilient
seat and seal designs that deliver tighter shut-off, and a stem sealing that requires less torque
output from the actuator. This translates into longer lasting, continuous valve operation with
minimum upkeep. The rotary movement of Habonim’s valves make them safe and simple
to automate and they are ideal for flow control operations. In contrast, linear- movement
globe valves have a tendency to seize up, are susceptible to blockages, and require constant
maintenance to deal with stem leakage problems.
The Habonim valve is fitted with specially designed packing configurations. A variety of
packing materials are available to meet the needs of demanding control applications
including aggressive media, extreme temperature, and pressure conditions that range from
deep vacuum to high pressure. The end result is a high-endurance control valve assembly
that is more cost-effective and maintenance-friendly than any other type of actuated valve.
Less cavitation damage
The Habonim valve offers a streamlined configuration that is less prone to cavitation damage.
As liquid passes through the vena contracta velocity increases and pressure decreases. If the
pressure in this area falls below the vapor pressure of the flowing liquid, vaporization (boiling)
occurs. Vapor bubbles continue downstream where velocity decreases and pressure recovers.
The vapor bubbles then collapse or implode.
Imploding vapor bubbles can cause serious cavitation damage, i.e., pitting of the valve metal
surfaces. In globe valves this damage occurs inside the valve casing, causing an erosive effect
that may eventually result in costly valve replacement. However, with a Habonim ball valve,
no damage occurs to the valve itself in the event of cavitation, as it occurs downstream of the
valve seat area and beyond the valve outlet.
Habonim R&D engineers have developed a new line of anti-cavitation trims for extreme
applications. A grid of tubular holes facilitates linear or equal flow percentage characteristics
that greatly reduce noise and vibration, as well as limiting cavitation damage. The grid is
electro-eroded into the downstream metal seat and then lapped for a perfect match with
the ball. The complete set is hardened to eliminate galling and increase erosion resistance.
Flow
P1
P2
Vapor
Pressure
Cavitation
Point
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CONTROL VALVES
