Fisher CAV4 Control Valve0 pages

Product Bulletin

CAV4 Valve

51.2:CAV4
June 2012

D101497X012

Fisherr CAV4 Control Valve
Features

The Fisher CAV4 control valve with Cavitrolt IV trim is
designed specifically for liquid applications, such as
boiler feedwater recirculation, where pressure drops
are above 207 bar (3000 psi) and cavitation is a serious
problem. The CAV4 valve is available in a broad range
of valve body sizes and styles, including NPS 2 through
6 angle, globe, and offset globe.

Long Trim Life–Pressure-staging design and
separation of shutoff and throttling locations
decrease clearance-flow erosion. Hardened trim
materials result in improved wear resistance.

Tight Shutoff–Soft metal-to-metal seat provides
tight shutoff without the need for periodic lapping.
The anti-extrusion ring provides an enhanced valve
plug seal.

The CAV4 valve's various valve plug constructions
(figure 1) provide temperature capabilities through
417_C (800_F). The seal ring construction is used
where temperatures are equal to or lower than 232_C
(600_F) (see figure 5), and both the stem-balanced
and the piston ring constructions are used with
temperatures up to 417_C (800_F). In addition, the
CAV4 valve is offered with either a separable seat ring
for low-temperature (up to 232_C [450_F])
applications or with an integral seat cage for
high-temperature (up to 417_C [800_F]) applications.
The NPS 3 is available only with a clamped-in lower
cage and replaceable seat ring.

Cavitation Decreased–A properly sized CAV4 valve
with Cavitrol IV trim decreases cavitation and its
resultant damage and noise.

TSO (Tight Shutoff) Trim–Valves with TSO trim
(figure 1) are factory tested to a more stringent
Emerson Process Managementt test requirement
of no leakage at time of shipment using ANSI/FCI
Class V procedures.
(continued on page 3)

667
ACTUATOR
SEPARABLE
SEAT RING
CAV4
VALVE BODY

LOWER CAGE
ASSEMBLY

CAGE
RETAINER
UPPER
CAGE

W3667-1

W7596

ANGLE

VALVE PLUG AND
STEM ASSEMBLY

W5601

OFFSET GLOBE
Fisher 657-CAV4 Control Valve Assembly with Cavitrol IV Trim

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