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Flowserve Worcester Controls cryogenic valves have key features for outstanding performance in cryogenic applications. These include:

Positive Ball Cavity Relief – An upstream relief hole in the ball

prevents dangerous overpressure due to thermal expansion. On

extended stem valves through 2", a one-piece stem with alignment

pin assures proper orientation of the ball.

Pressure Safe Stem – Both one-piece and two-piece, assembledinside-

the-body stems are safe from blowout and are supported with

Polyfill® thrustwashers.

Zero Leak Packing – Belleville live-loaded TFE packing rings and stem

centering followers assure zero leakage through the toughest, highcycle

applications. Special V82 graphite option allows increased cycle life and ability to adjust under cryogenic temperatures.

Effective Bonnet Extensions – The stem extensions of Worcester

Controls' cryogenic valves conform to standard industrial practices.

That means wall thickness and lengths that keep heat transfer down,

the packing frost-free, operational torques low, and actuators solidly

supported.

High-Performance/Low-Thermal Stress – The special "part

compatibility" design of valve parts, Polyfill seats and body seals

assure tight shutoff, zero body leakage and low torque through large

thermal excursions from ambient to -425°F.

Valves Designed for Automation – Approximately 40% of cryogenic

installations require fail-safe operation or automatic on/off control.

Worcester Controls has the pneumatic and electronic, computercompatible

controls for your installation.

Valves Designed for Fire Safety – A Series 94 double-graphite, stemsealed

fire-tight version of our cryogenic valve is available through

the Custom Products Department. These valves are especially

effective in hydrogen and liquefied natural gas systems. The Series 94 also offers exceptiona FEM capability and design for near zero leakage stem seal performance for critical applications.

Valve sizes and configurations -

Flowserve Worcester Controls cryogenic valves are available in four

basic body configurations; C44 (1/4"-2"), C44 Diverter (1/2"-2"), C4

Wafer (3"-6"), and C51 Flanged (3"-6"). All four valve styles offer the

same features: exclusive Polyfill seats, all stainless steel construction,

pressure-safe stem, extension bonnet lengths, positive ball cavity

relief and low operational torques.

Environmental Control

Before final assembly, valve components are cleaned and degreased.

Cleaning and tagging procedures for Worcester cryogenic valves are

based on major cryogenic producer specifications. Please contact the

factory for details.

- Assembly occurs in a Class 100 environment, per Federal Standard

209B for assembly and test.

- Stainless Steel Passivation – Worcester engineering specifications

strictly define procedures for cleaning, descaling and passivating

stainless steel parts. Inspection is performed with a copper sulfate

test per ASTM A380.

- Wipe Test – All wetted components are wipe tested using Whatman®

#44 paper.

- Helium Leak Test – Valves are dry tested, internally pressurized with

200 psi helium and checked with a helium leak detector (Helium Mass

Spectrometer sensitive to 1 x 10-5 cc/sec.).

- Vacuum Sealed – After all testing has been completed, cryogenic

valves are capped with protective plastic end caps, stamped, tagged

and heat sealed in 4 mil polyethylene bags. This ensures valve

integrity up to the point of installation.

- Custom Testing – On request, special material, valve integrity,

tightness and operational testing can be performed with valves

submerged in liquid nitrogen.