Chevron packing is a valuable resource for industrial valves owing to its
specific features like durability, high elasticity, tough resistive power and
above all the ability to withstand high/low pressures.
Crane’s Xomox Tufline severe service valves, for example, use
Chevron packing, particularly in valves designed for alkylation service. These particular valves are made of carbon steel or monel body and monel trim which are required to withstand the
corrosive nature of hydrofluoric acid
(HF acid). Given the highly corrosive nature of HF acid service, alkylation
valves require reliable packing making Chevron
packing a reliable choice.
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| Xomox Tufline sleeved plug valve. Source: cranecpe.com |
Designing the seal
The Chevron packing seal
consists of a base ring, V-ring and a pressure ring. All three rings are come
together to form a seal that reacts to the pressure changes. The base ring is
made of a cotton fabric mixed with nitrile rubber that ensures complete safety
from the extrusion problems. This ring is then backed up by the V-rings which
are also made from the cotton fabric as well as the nitrile elastomers,
combined as per industry standards. The overall purpose of the packing is to
increase the sealing efficiency and balance the load which is crucial for better
performance. The third and last element of the packing are the pressure rings
whose function is to distribute the pressure equally among the rings and
protect its different, integral elements from disproportionate wear and tear.
Usually one base rings is combined with one or three V-rings
followed by one pressure ring. The Chevron seals find their use in industrial
applications as well as other robust and high-alloy
valves.
Benefits of using Chevron seals
There are several advantages of using Chevron seals in monel valves or other packing
solutions:
- It has the ability to adjust to a broad range of
demanding industrial applications.
- Durability and lasting performance reduces down-time,
cost-of-ownership and increases worker safety.
- Despite wear and tear, the Chevron sealing and packing
system will work well without adversely affecting performance.
- Flexible to bear even the severe temperature and pressure
conditions.
Use
Chevron packing can be found in many different types of
valves, but are of particular use in corrosion
resistant valves designed for
alkylation service and made of monel. Other industrial purposes of such seals
include pumps, marine hydraulics, and injection molding machines.
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