Page 28 - Apollo - Industrial Applications Guide

INTRODUCTION:

There are several services where Apollo® Ball valves require venting. There are
three types of venting utilized in our ball valves. Slot vented ball, side vented ball, SERVICES:
and internal vented body. Venting is utilized to limit excessive pressure build
ups that can cause failure of seats, seals, and even metallic components. Our It is the recommendation of Apollo® Valves
ball valves are all floating design which means they are normally bi-directional Mfg. by Conbraco Industries, Inc., that
in their sealing ability. However, once the valves are equipped with side vented venting be utilized in the following services
balls or internal vented bodies they become uni-directional in their sealing (along with many others). These services
should always include either a Side Vented
ability. This is not the case with slot vented ball valves. Ball or Internally Vented Body. One of these
two types of venting should be incorporated
anytime the media has the ability to
CAUTION: When installing, and when performing maintenance, it is extremely important flash, suddenly decompose, or has a high
that the (in the case of side vented balls or internal vented bodies) be installed, and/or coefficient of thermal expansion
reassembled such that the venting port is located on the upstream (positive pressure side of
the valve when the valve is in the closed position. Flow arrows mean nothing when the valve Chlorine
is open. They only matter when the valve is in the closed position!!!
Alcohols
Glycols
CHARACTERISTICS: Ethylene Oxide
Syn-Gas
Slot venting valves does not change their normal operating or sealing ability. Hydrogen Peroxide
Floating ball valve designs with side vented balls or internally vented bodies Creosote
become uni-directional in their sealing ability. Vented Ball valves are always Ammonia
marked with a direction-of-flow arrow. The key is to install them correctly. As Fuels
with all new valves read the Installation, Operation, and Maintenance Manual Oils
(found at www.apollovalves.com) Thermal Fluids

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