Technical Specifications

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Masoneilan 21000 Series Top Guided Globe Valve | 7

PTFE - female adapter

PTFE - V-Ring

PTFE - male adapter

PFE - V -Ring

7.6.3.1.4 Spring Loaded Follower

The spring loaded follower consists of an upper and

lower follower and eight (8) disc springs (see Figure

below). The springs are installed inside the lower

follower and positioned alternately. The assembly

is held together by tape, which must be removed

before installation.

Upper

Follower

Lower

Follower

Disc

Springs

Scribe

Mark

7.6.3.2 Packing Installation

a. The packing must be lubricated with Krytox

ﬂuori-

nated grease prior to installation (Krytox GPL206 or

equivalent).

b. Packing should be lubricated as a set (not

individually) to minimize getting lubricant

between the rings.

c. Packing should be lubricated with a generous

application to the O.D. and I.D. of the packing set.

Note: All exposed surfaces of the packing set must be

covered with the lubricant.

d. PFE/PTFE is to be installed as a set. Carefully slide

the packing set down the stem. Do not cock or

force the packing on the threads.

If the packing set separates while on the stem,

do not remove. Continue installing the remaining

pieces to put the set back together.

e. Gently press the packing into the packing box. Do

not tap the packing down into the box.

f. The spring loaded follower is installed on top of the

packing. This follower is installed as an assembly held

together by tape. This tape should be removed after

assembly. Proper assembly of the packing box will

leave the top of the Lower Follower 0.25 - 0.50 inches

(6 to 13 mm) above the bonnet.

A groove is scribed into the O.D. of the upper

follower. The packing ﬂange is tightened evenly

until the top of the Lower Follower aligns with the

scribe mark (groove) in the Upper Follower.

Note: This is the optimum loading for this packing.

Further tightening will shorten life of the packing.

Thread locking compound can be used on packing

nuts.

g. The packing should be checked for leakage.

h. Packing load should be checked after the valve has

The packing is provided as a set of ﬁve pieces. It consists of

two adapter rings and three V-rings. An alternating pattern

of Perﬂuoroelastomer (PFE) and long carbon ﬁber ﬁlled

Teﬂon (PTFE) V-rings are used.

Applied properly, this packing exhibits very little cold ﬂow

(or creep). Consequently, it can effectively prevent fugitive

emissions leaks from a control valve. The LE Packing

system can directly replace conventional packing,

requiring no modiﬁcation to the control valve or actuator.

A spring loaded, two-piece follower assembly is used to

maintain a constant load on the packing, and is necessary

for thermal cycling applications. As the deﬁnition of thermal

cycling can vary, and processes are potentially subject to

unpredicted thermal gradients, LE Packing is only available

with the spring loaded follower.

Installation should be performed as detailed in the

following paragraphs.

7.6.3.1 Preparation

7.6.3.1.1 Stem

Inspect stem for any nicks or scratches on the

surface ﬁnish. Reject the stem for any of these

reasons as they may damage packing.

Note: A properly etched part number on the stem in

the packing area will have no adverse effect on the

performance of the packing.

Stem ﬁnish should be 3-7 AARH (Ra 0,1/0,2).

7.6.3.1.2 Packing Box

Note: Bonnets that have a lube hole or leak detection

port are unacceptable for use with the packing

arrangement shown in Figure 7.

CAUTION

WARNING

DANGER

Packing box should be clean and free of burrs, rust,

and any foreign matter. Parts can be cleaned with

denatured alcohol.

Note: Packing box finish should be 125 AARH (Ra 3,2)

or better.

The packing box may be bored or honed oversize by

up to 0.015" (0.38 mm) above the nominal diameter

to improve the ﬁnish. For instance, a nominal 0.875"

(22.22 mm) packing box may be bored or honed up

to 0.890" (22.60 mm) and the LE Packing will still seal

properly.

Packing box must be ﬁnished to the bottom of the

bore.

7.6.3.1.3 Packing

Inspect packing rings. Do not use packing if any

nicks or scratches on packing are observed.

Check packing and ensure that it is in the proper

arrangement (see Figure below). PFE material can

be identiﬁed by the gloss black molded ﬁnish. PTFE

material has a dull black machined ﬁnish.