Fisher ET - Manual (Page 3)

ED, ET, EZ, HP, HPA Valves w/ 657/667 Actuator
SIL Safety Manual
July 2010
3
Related Literature
Hardware Documents:
51.1:ED, Fisher ED, EAD, and EDR SlidingŦStem
Control Valves Bulletin: D100017X012
Fisher ED and EAD easyŦe t Valves CL125 through
CL600 Instruction Manual: D100390X012
51.1:ET, Fisher ET, EAT, and ETR SlidingŦStem
Control Valves Bulletin: D100022X012
Fisher ET and EAT easyŦe t Valves CL125 through
CL600 Instruction Manual: D100398X012
51.1:EZ, Fisher EZ SlidingŦStem Control Valve
Bulletin: D100025X012
Fisher EZ easyŦe t Control Valve Instruction
Manual: D100401X012
51.2:HP, Fisher HP Series Control Valves Bulletin:
D101635X012
Fisher HP and HPA Control Valves Instruction
Manual: D101634X012
Guidelines/References:
D Safety Integrity Level Selection – Systematic
Methods Including Layer of Protection Analysis,
ISBN 1-55617-777-1, ISA
D Control System Safety Evaluation and
Reliability, 2nd Edition, ISBN 1-55617-638-8, ISA
D Safety Instrumented Systems Verification,
Practical Probabilistic Calculations, ISBN
1-55617-909-9, ISA
Reference Standards
Functional Safety
D IEC 61508: 2000 Functional safety of
electrical/electronic/ programmable electronic
safety-related systems
D ANSI/ISA 84.00.01-2004 (IEC 61511 Mod.)
Functional Safety – Safety Instrumented Systems for
the Process Industry Sector
Device Description
Fisher ED single-port valves (figure 1) have cage
guiding, quick-change trim, and balanced
push-down-to-close valve plug action. Valve
configurations are as follows:
ED--Globe-style valve with metal-to-metal seating for
all general applications over a wide variety of
pressure drops and temperatures.
EAD--Angle version of ED, used to facilitate piping
or in applications where a self-draining valve is
required.
Fisher ET single-port valves (figure 1) have cage
guiding, quick-change trim, and balanced
push-down-to-close valve plug action. Valve
configurations are as follows:
ET--Globe-style valve with metal-to-PTFE seating
(standard for all except Cavitrol III cages) for
stringent shutoff requirements, or metal-to-metal
seating (standard for Cavitrol III cages, optional for
all others) for higher temperatures.
EAT--Angle version of ET, used to facilitate piping or
in applications which require a self-draining valve.
Fisher EZ valves (figure 1) are globe-style with
integral end connections, post guiding, and
quick-change trim. These valves are used in
chemical or hydrocarbon processing applications or
in applications that require control of nonlubricating,
viscous, or other hard-to-handle fluids.
Fisher HP Series high-pressure globe and angle
valves (figure 1) have metal seats, cage guiding,
quick change trim, and push-down-to-close valve plug
action. HPD, HPAD, HPT, and HPAT valves use
balanced valve plugs. HPS and HPAS valves use an
unbalanced valve plug. To provide a seal between
the cage and a balanced valve plug, the HPD and
HPAD valve plugs use piston rings; the HPT and
HPAT valve plugs use a pressure-assisted seal ring.
A Whisper Trim cage can be used with an HPD,
HPAD, HPS, HPAS, HPT, or HPAT valve plug. A
Cavitrol III cage can be used with an HPS, HPAS,
HPT, or HPAT valve plug.