Castle
valves
The ring in a castle valve has cut outs (like the top of a castle turret) that
fit into the spaces made by the indentations of the flutes. Although the ring
moves forward with the melt and back to shut-off, it is always interlocked with
the flute. This causes it to spin with the flute, eliminating the wear against
the ring and the flute. While this can minimize wear within the valve, the spinning
ring can cause wear to the inside of the barrel. Repairing this type of damage
can often be much more costly than replacing the valve.
Carbide
wear resistant valves Since the area of highest wear in a ring valve is usually between the ring and
the base of the flutes, some manufactures will imbed extremely durable, carbide
inserts at the base of each flute (figure 12). As the valve spins against the
ring, the inserts protect the flute area. This is an excellent choice when abrasive
materials are often run or for any operation that is looking for a highly effective
extended wear valve. Also available are carbide-faced valves. These valves have
a thin carbide coating applied to the valve’s wear surfaces (between the
base of the flute and the ring, or between the seat and the ring) to protect
these areas from wear.
Castle
valves 
Since the area of highest wear in a ring valve is usually between the ring and
the base of the flutes, some manufactures will imbed extremely durable, carbide
inserts at the base of each flute (figure 12). As the valve spins against the
ring, the inserts protect the flute area. This is an excellent choice when abrasive
materials are often run or for any operation that is looking for a highly effective
extended wear valve. Also available are carbide-faced valves. These valves have
a thin carbide coating applied to the valve’s wear surfaces (between the
base of the flute and the ring, or between the seat and the ring) to protect
these areas from wear. 