26-07-2012, 03:01 PM
CONTROL VALVE
Control Valve (ES & EAS) - Fisher.pdf (Size: 533.69 KB / Downloads: 55)
Introduction
Scope of Manual
This instruction manual includes installation,
maintenance, and parts information for 0.5 through
8-inch Design ES valves, and 1- through 6-inch
Design EAS valves, through Class 600 ratings.
Refer to separate manuals for instructions covering
the actuator and accessories.
No person may install, operate, or maintain a Design
ES valve without first being fully trained and
qualified in valve, actuator, and accessory
CAUTION
When ordered, the valve configuration
and construction materials were
selected to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions. Since
some body/trim material combinations
are limited in their pressure drop and
temperature ranges, do not apply any
other conditions to the valve without
first contacting your Fisher sales
office.
Maintenance
Valve parts are subject to normal wear and must be
inspected and replaced as necessary. Inspection
and maintenance frequency depends on the severity
of service conditions. This section includes
instructions for packing lubrication, packing
maintenance, trim maintenance, and ENVIRO-SEAL
bellows seal replacement. All maintenance
operations may be performed with the valve in the
line.
Packing Maintenance
Key numbers refer to figure 3 for PTFE V-ring
packing and to figure 5 for PTFE/composition
packing, unless otherwise indicated.
For spring-loaded single PTFE V-ring packing, the
spring (key 8, figure 3) maintains a sealing force on
the packing. If leakage is noted around the packing
follower (key 13, figure 3), check to be sure the
shoulder on the packing follower is touching the
bonnet. If the shoulder is not touching the bonnet,
tighten the packing flange nuts (key 5, figure 8) until
the shoulder is against the bonnet. If leakage cannot
be stopped in this manner, proceed to the replacing
packing procedure.
Lapping Metal Seats
A certain amount of leakage should be expected
with metal-to-metal seating in any valve body. If the
leakage becomes excessive, however, the condition
of the seating surfaces of the valve plug and seat
ring can be improved by lapping. (Deep nicks should
be machined out rather than ground out.) Use a
good quality lapping compound of a mixture of 280
to 600-grit. Apply the compound to the bottom of the
valve plug.
Control Valve (ES & EAS) - Fisher.pdf (Size: 533.69 KB / Downloads: 55)
Introduction
Scope of Manual
This instruction manual includes installation,
maintenance, and parts information for 0.5 through
8-inch Design ES valves, and 1- through 6-inch
Design EAS valves, through Class 600 ratings.
Refer to separate manuals for instructions covering
the actuator and accessories.
No person may install, operate, or maintain a Design
ES valve without first being fully trained and
qualified in valve, actuator, and accessory
CAUTION
When ordered, the valve configuration
and construction materials were
selected to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions. Since
some body/trim material combinations
are limited in their pressure drop and
temperature ranges, do not apply any
other conditions to the valve without
first contacting your Fisher sales
office.
Maintenance
Valve parts are subject to normal wear and must be
inspected and replaced as necessary. Inspection
and maintenance frequency depends on the severity
of service conditions. This section includes
instructions for packing lubrication, packing
maintenance, trim maintenance, and ENVIRO-SEAL
bellows seal replacement. All maintenance
operations may be performed with the valve in the
line.
Packing Maintenance
Key numbers refer to figure 3 for PTFE V-ring
packing and to figure 5 for PTFE/composition
packing, unless otherwise indicated.
For spring-loaded single PTFE V-ring packing, the
spring (key 8, figure 3) maintains a sealing force on
the packing. If leakage is noted around the packing
follower (key 13, figure 3), check to be sure the
shoulder on the packing follower is touching the
bonnet. If the shoulder is not touching the bonnet,
tighten the packing flange nuts (key 5, figure 8) until
the shoulder is against the bonnet. If leakage cannot
be stopped in this manner, proceed to the replacing
packing procedure.
Lapping Metal Seats
A certain amount of leakage should be expected
with metal-to-metal seating in any valve body. If the
leakage becomes excessive, however, the condition
of the seating surfaces of the valve plug and seat
ring can be improved by lapping. (Deep nicks should
be machined out rather than ground out.) Use a
good quality lapping compound of a mixture of 280
to 600-grit. Apply the compound to the bottom of the
valve plug.