Instruction Manual

Instruction Manual
D103803X012
Z500 Valve
April 2015 - rev B
8
2. Actuators supplied with the valve may require maintenance per the actuator manufacturer's recommendations. For
valves supplied with gears, the grease in the gearbox might need to be cleaned out and replaced periodically. Use
only high temperature grease recommended for gearboxes.
3. Metal-seated ball valves have high torques. Consult your Emerson Process Management sales office
for more
information.
4. Valves operate clockwise to close and counterclockwise to open. Gears and actuators are marked with arrows and
symbols to show valve position and operating direction. Lever operated valves have an integral lockplate so that
only the correct operating direction is possible. The lockplate has the “O” for open and the “C” for closed marked to
show proper position. The lever is always aligned with the ball bore for positive proof of ball position. Gears and
actuators have adjustable stops for proper ball positioning.
5. The ball is mate lapped to the end adapter seat. The top of the stem is marked to show the proper orientation of the
lapped side of the ball.
6. This valve should be either normally open or normally closed. Throttling with this valve is not recommended for
extended periods. Throttling for brief periods during startup or shutdown is allowed.
Maintenance
Valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection
and replacement depends upon the severity of service conditions.
WARNING
Avoid personal injury from sudden release of process pressure. Before performing any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
from both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.
D The valve packing area may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
1. If valve maintenance is required, contact your Emerson Process Management sales office.