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Braided Packings Guide USA - James Walker

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Graphite-based<br />

Grafpak<br />

For high temperature/pressure steam<br />

Description<br />

Dense, high strength packing of crossplaited<br />

premier quality graphite filament<br />

yarns. Treated with pure graphite before<br />

and after plaiting, and further treated with<br />

special corrosion inhibitors.<br />

Typical applications<br />

Control valves and main stop valves on<br />

high temperature/pressure steam circuits at<br />

power stations, chemical plants, industrial<br />

services, and on marine installations. Also<br />

suitable for duties with water, condensate,<br />

alkalis, acids, solvents and most<br />

chemicals.<br />

Frequently used as end rings in<br />

conjunction with Supagraf ® Molded Rings<br />

(page 10) and in Valvemaster ® live-loaded<br />

control system (page 28).<br />

Prime features<br />

l Suitable for wide range of aggressive<br />

media.<br />

l Low friction for low torque operation.<br />

l Tough and resistant to fretting and<br />

extrusion.<br />

Chemical properties<br />

Chemically inert within the range pH 0-14,<br />

excluding strong oxidising agents.<br />

Service capabilities<br />

Valve stem duties<br />

Maximum temperatures<br />

Steam & oxidising<br />

conditions +1022°F (+550°C)<br />

Non-oxidising (significantly higher,<br />

refer to <strong>James</strong> <strong>Walker</strong>)<br />

Minimum temperature -58°F (–50°C)<br />

Max system pressure 2175psi (15MPa) typical<br />

(refer to <strong>James</strong> <strong>Walker</strong><br />

for higher pressures)<br />

How supplied<br />

Ex-stock: all popular square sections<br />

from ⁄÷•" cross-section upwards to<br />

suit all standard valves. In boxes containing<br />

26 ⁄÷¢' (8m), or supplied as split preformed<br />

rings and sets. Full fitting instructions are<br />

included.<br />

Graphite Filament Packing<br />

Highly versatile gland packing<br />

Description<br />

Cross-plaited packing of high strength<br />

graphite yarn, impregnated with PTFE<br />

dispersion and graphite powder to increase<br />

density and sealing efficiency.<br />

Typical applications<br />

Gland packing duties with a wide range<br />

of media across many industrial sectors.<br />

Its versatility with valves, rotary equipment<br />

and reciprocating pumps allows users to<br />

standardize on one range of packings for<br />

the majority of their general plant.<br />

Prime features<br />

l Excellent chemical and thermal<br />

resistance.<br />

l Good thermal conductivity.<br />

l Excellent lubricity.<br />

l Dense and resilient for long operational<br />

life.<br />

Chemical properties<br />

Chemically inert within the range pH 0-14,<br />

excluding strong oxidising agents such<br />

as concentrated sulphuric and nitric acid,<br />

plus molten alkali metals, fluorine gas and<br />

fluorine compounds.<br />

Service capabilities<br />

Valve stem duties<br />

Maximum temperature +752°F (+400°C)<br />

Minimum temperature -58°F(–50°C)<br />

Max system pressure 2175psi (15MPa)<br />

Centrifugal pumps &<br />

rotary equipment<br />

Operating temperatures As valve stem<br />

Maximum shaft speed 3937fpm (20m/s)<br />

Max system pressure 363psi (2.5MPa)<br />

Reciprocating pumps & rams<br />

Operating temperatures As valve stem<br />

Maximum rod speed 787fpm (4m/s)<br />

Max system pressure 725psi (5MPa)<br />

How supplied<br />

Ex-stock: all popular square sections<br />

from ⁄÷•" cross-section upwards, in boxes<br />

containing 26 ⁄÷¢' (8m). Also supplied as<br />

split preformed rings and sets. Full fitting<br />

instructions are included.<br />

To order or get further details, call your local contact shown 11 on rear cover or listed at www.jameswalker.biz 11

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