Fisher® YD and YS Control Valves0 pages

Product Bulletin

YD and YS Valves

51.1:YD
June 2014

D100031X012

Fisherr YD and YS Control Valves
Fisher YD and YS three-way cage-guided valves are
designed for throttling or flow-switching (on-off)
service, and are available in the following
constructions:
YD (Balanced)–For general converging (flow-mixing)
and diverging (flow-splitting) service. Available in
standard and high-temperature versions (see figure 1).
YS (Unbalanced)–For general converging service.
When used in diverging service, recommended for
on-off applications only (see figure 1).
The Fisher YD and YS product lines are available for a
wide range of applications, including sulfide and
chloride stress-cracking environments common to the
oil and gas production industries. To discuss available
constructions, contact your Emerson Process
Management sales office and include the applicable
codes and standards required for these environments.

W7593

Features

Economy--Balanced valve plug construction in the
YD permits use of smaller, lower-cost actuators. A
single one-piece valve accommodates both trim
designs and uses Fisher easy-e™ bonnets, gaskets,
and packing, thus cutting spare part inventory
costs.
Application Flexibility--Multipurpose capability
results from a valve designed specifically for
three-way control. A variety of valve sizes, end
connections, port diameters, and trim materials
provides design versatility for your control needs.
Excellent Sealing Capabilities--The ENVIRO-SEAL™
packing system option is available. This packing
system provides excellent sealing, guiding, and
loading force transmission. The improved sealing of
the ENVIRO-SEAL system can help control emissions
to below the EPA (Environmental Protection
Agency) limit of 100 ppm (parts per million) from

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Fisher YD Valve with 667 Actuator

valves. The ENVIRO-SEAL packing systems feature
PTFE, Graphite ULF, or Duplex packing with
live-loading for reduced packing maintenance.

Long Trim Life--Hardened trim materials provide
excellent wear resistance.

Easy Maintenance--Cage-type construction
simplifies inspection and removal of parts.

Parts Commonality--Packing parts, including
packing flange, studs and nuts, and packing kits, are
common to the YD, YS, and Fisher easy-e control
valves.

Valve Plug Stability-- Rugged cage guiding provides
high valve plug stability, which reduces vibration
and mechanical noise.