Data Sheet

YD and YS Valves
D100031X012
Product Bulletin
51.1:YD
June 2014
4
ENVIRO-SEAL Packing System Specifications
Applicable Stem Diameters
J 9.5 mm (3/8 inches), J 12.7 (1/2), J 19.1 (3/4),
and
J 25.4 (1) diameter valve stems
Maximum Pressure/Temperature Limits
(1)
To Meet the EPA Fugitiv e Emission Standard of 100
PPM
(2)
For ENVIRO-SEAL PTFE and ENVIRO-SEAL Duplex packing
systems: full CL300 up to 232_C(450_F)
For ENVIRO-SEAL Graphite ULF packing system: 104 bar
(1500 psig) at 316_C(600_F)
Construction Materials
PTFE Packing Systems
Packing Ring and Lower Wiper: PTFE V-ring
(3)
Male and Female Adaptor Rings: Carbon-filled PTFE
V-ring
Anti-Extrusion Washer: Filled PTFE
Lantern Ring: S31600 (316 stainless steel)
Spring:
J 17-7PH stainless steel or J N06600
Packing Box Flange: S31600
Packing Follower: S31600 lined with carbon-filled PTFE
Packing Box Studs: SA193-B8M Class 2
Packing Box Nuts: S31600
Graphite ULF Packing Systems
Packing Ring: Graphite rings
Spring:
J 17-7PH stainless steel or J N06600
Packing Box Flange: S31600
Packing Follower: S31600 lined with carbon-filled PTFE
Packing Box Studs: SA193-B8M Class 2
Packing Box Nuts: S31600
1. Refer to the valve specifications in this bulletin for pressure/temperature limits of valve parts. Do not exceed the press ure/temperature rating of the valve. Do not exceed any applicable code
or standard limitation.
2. The Environmental Protection Agency (EPA) has set a limit of 100 parts per million (ppm) for fugitive emissions from a valve in selected VOC (VolatileOrganicCompound)services.
3. In vacuum service, reversing the ENVIRO-SEAL PTFE packing rings is not necessary.
Figure 1. Construction Details
CAGE
O-RING
LOWER
CAGE
VALVE
PLUG
SEAT
RING
LOWER
SEAT
RING
VALVE
PLUG
UPPER
CAGE
REVERSIBLE
UPPER
SEAT RING
SEAL
RING
BACKUP
RING
SEAT RING
GASKET
RETAINING
RING GASKETS
LOWER
CAGE
UPPER
CAGE
VALVE
PLUG
SEALS
RETAINING
RING
UPPER
SEAT RING
GASKET
LOWER
SEAT RING
GASKET
STANDARD YD
DETAIL OF HIGH TEMPERATURE
YD TRIM
YS
W9045-1
40A3551-C
A1891-1
W9046-1
SPRING