Instruction Manual
D100425X012
YD and YS Valves
July 2017
2
Table 1. Specifications
Valve Sizes, Ratings, and End Connections
(1,2)
Cast Iron Valves
Flanged:
NPS 1‐1/2 through 6 CL125 flat‐face or
CL250 raised‐face flanges per ASME B16.1
Screwed:
NPS 1‐1/2 and 2 consistent with ASME B16.4
Steel and Stainless Steel Valves
Flanged:
NPS 1 through 8 CL150, 300, and 600
raised‐face or ring‐type joint flanges per ASME B16.5
Screwed or Socket Welding:
NPS 1/2 through 2
consistent with ASME B16.11
Buttwelding:
NPS 1 through 8. All available
ASME B16.25 schedules that are consistent with
ASME B16.34
Also see table 2
Maximum Inlet Pressure
(1)
Cast Iron Valves
Flanged:
Consistent with CL125B or 250B per ASME
B16.1
Screwed:
Consistent with CL250 per ASME B16.4
WCC and Stainless Steel
Valves
Flanged:
Consistent with CL150, 300, and 600
(3)
per
ASME B16.34
Screwed or Welding:
Consistent with flanged CL600
per ASME B16.34
Do not exceed the pressure, temperature, and
pressure drop conditions specified when the valve
was ordered. See the Installation section for
additional information.
Shutoff Classifications per ANSI/FCI 70‐2
and IEC 60534‐4
YD
Standard Design:
Class IV
High‐Temperature Design:
Class II
YS
Standard Class:
Class IV
Optional Class:
Class V
Flow Characteristic
Linear
Approximate Shipping Weights
NPS 1/2, 3/4 Valves:
14 kg (30 pounds)
NPS 1 Valves:
18 kg (40 pounds)
NPS 1‐1/2 Valves:
27 kg (60 pounds)
NPS 2 Valves:
39 kg (85 pounds)
NPS 2‐1/2 Valves:
50 kg (110 pounds)
NPS 3 Valves:
68 kg (150 pounds)
NPS 4 Valves:
109 kg (240 pounds)
NPS 6 Valves:
227 kg (500 pounds)
NPS 8 Valves:
447 kg (985 pounds)
1. EN (or other) ratings and end connections can usually be supplied; consult your
Emerson sales office
or Local Business Partner.
2. The pressure or temperature limits in this manual, and any applicable standard limitations, should not be exceeded.
3. Certain bonnet bolting material selections may require a CL600 easy‐e valve assembly to be derated. Contact your Emerson sales office or Local Business Partner.
Description
The YD and YS valves are three‐way valves for throttling or on‐off (flow switching) service with converging (flow
mixing) or diverging (flow splitting) flow patterns. YS valves, when used in diverging service, are recommended for
on‐off applications only. These valves are generally shipped as part of a control valve assembly, having a diaphragm,
piston, or manual actuator mounted on them. A typical construction is shown in figure 1.
Specifications
Specifications for the YD and YS valves are shown in table 1. Some specifications appear on the actuator nameplate if
the valve is part of a complete control valve assembly.
Educational Services
For information on available courses for Fisher YD and YS valves, as well as a variety of other products, contact:
Emerson Automation Solutions
Educational Services - Registration
Phone: 1-641-754-3771 or 1-800-338-8158
E-mail: [email protected]
emerson.com/fishervalvetraining
