PROCEED HPA 3 Manual de instrucciones descargar pdf (Pagina 14)

Instruction Manual

D101634X012

HP and HPA Valves

October 2014

When all nuts are tightened to that torque value, increase the torque by 1/4 of the specified nominal torque and

repeat the crisscross pattern. Repeat this procedure until all nuts are tightened to the specified nominal value. Apply

the final torque value again and, if any nut still turns, tighten every nut again.

Note

When installing packing rings, prevent entrapping air between the rings. Add the rings one at a time without forcing them below

thechamferofthepackingboxentrancechamber.Aseachsuccessiveringisadded,thestackshouldnotbepusheddownmore

than the thickness of the added ring (figure 5).

15. Install new packing and the metal packing box parts according to the appropriate arrangement in figure 3. If

desired, packing parts may be pre-lubricated with a silicon base grease for easier installation. Slip a smooth-edged

pipe over the valve stem, and gently tamp each soft packingpartintothepackingbox,beingsurethatairisnot

trapped between adjacent soft parts.

16. Slide the packing follower, wiper, and packing flange into position. Lubricate the packing flange studs (key 20) and

the faces of the packing flange nuts (key 21). Replace the packing flange nuts.

For the spring-loaded PTFE V-ring packing shown in figure 3, tighten the packing flange nuts until the shoulder on the

packing follower (key 28) contacts the bonnet.

Figure 5. Installing Graphite Ribbon/Filament Packing Rings One at a Time

VALVE STEM

PACKING

FOLLOWER

BONNET

TOP OF

PACKING RING

EVEN WITH

BOTTOM OF

ENTRANCE

CHAMFER

INSTALLING

SECOND PACKING RING

A2207-2

INSTALLING

FIRST PACKING RING

For graphite packing, tighten the packing flange nuts to the maximum recommended torque shown in table 7. Then,

loosen the packing flange nuts, and retighten them to the recommended minimumtorqueshownintable7.

For other packing types, tighten the packing flange nuts alternately in small equal increments until one of the nuts

reaches the minimum recommended torque shown in table 7. Then, tighten the remaining flange nuts until the

packing flange is level and at a 90-degree angle to the valve stem.

For ENVIRO-SEAL or HIGH-SEAL live-loaded pa cking, refer to the note at the beginning of the Maintenance section.

17. Mount the actuator on the valve body assembly, and reconnect the actuator and valve plug stems according to

the procedures in the appropriate actuator instruction manual.

Trim Removal

For C-seal construction, see the appropriate C-seal sections in this manual.

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