Emerson D2 Manuel d'instructions télécharger pdf (Page 7)

Instruction Manual

D103031X012

D2 FloPro Valve

June 2011

WARNING

Avoid personal injury from sudden release of process pressure. If the process media starts to escape from the safety vent

(see figure 2) located in the bonnet neck of the valve body,

STOP DISASSEMBLY IMMEDIATELY!

The escape of process media indicates that the valve has NOT been isolated from the process media, or process pressure is

trapped in the valve body.

Check with your process or safety engineer for any additional measures that must be taken to protect against process

media.

4. Once the bonnet has been removed from the valve body, inspect the seat ring (key 5) for wear or damage. If the

seating surface has been damaged, remove it from the valve body. Also remove the seat ring gasket (key 6). Clean

and inspect the valve body gasket surface for damage. Visually inspect the valve body interior below the seat ring

for erosion. Replace the valve body if necessary.

To replace the seat ring, first install a new seat ring gasket. Install the new seat ring and tighten to 230 NSm (170

lbfSft).

Cover the opening in the valve body to prevent foreign material from getting into the valve body cavity.

5. Inspect the valve stem for scratches or wear, and valve plug for wear or damage. Replace if necessary.

6. If the valve plug requires replacement, use an open end wrench on the machined flats located on the valve stem

above the flow adjuster and unscrew the valve plug from the valve stem. Replace it with a new valve plug. Screw the

valve plug into the valve stem, being careful not to damage the plug seat or plug contour. Tighten to 18 NSm(13

lbfSft).

WARNING

Upon reassembly, ensure that no foreign material blocks the safety vent hole as shown in figure 2. If the safety vent hole is

blocked or plugged, possible personal injury from the sudden release of process pressure during maintenance disassembly

may occur.

7. Lubricate a new O-ring (key 13) with lithium grease and place it into the valve body as shown in figure 6 or 7. Ensure

that no foreign material blocks the safety vent hole. Screwthebonnetintothevalvebody,andtorquetoarangeof

542 to 678 NSm (400 to 500 lbfSft).

8. For air-to-open actuator action only, attach the pressure line to the actuator, and supply pressure to the actuator.

Loosen the socket head screws (key 29) and remove the flow adjuster (keys 14 and 15). Release the pressure to the

actuator. This allows the plug to find its seated position.

9. Set the flow adjuster to the desired travel position (see figure 2), and tighten the flow adjuster socket head cap

screws to 3 NSm(26lbfSin).

Packing, Valve Trim, and Actuator Maintenance

Note

The following maintenance procedures apply to both a ir-to-open and air-to-close actuator configurations, except as noted.

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Emerson D2 Manuel d'instructions Page 7