VREL® - High Pressure Sample Flow Control Valve0 pages

Variable Pressure Reducing Element

®

New Heavy-Duty Speed Handle
Substantially Reduces Turning Effort
U.S. Patent No. RE37,153

Features

Description

t Ergonomic speed handle substantially reduces
turning effort

Chemical analysis of water and steam samples in
modern power generation plants requires precise
control of flow and pressure. High pressure reduction
presents sampling problems for the system designer.
The Sentry VREL® is a valve specifically designed to
solve unique high pressure sampling problems.

t No valve/regulator erosion or wire drawing
t Fine flow control
t Fully retractable rods assure easy online purging

t Flows from 150 milliliters per minute up to 4 liters
per minute at pressure drops up to 5000 psig
(345 barg)

Industry Standard
The patented VREL® is the industry standard for
samples greater than 500 psig (34.5 barg) according
to the Annual Book of ASTM Standards, ASTM
Designation D3370.
The adjustable rod-in-tube type design allows for
variable pressure drop and flow control. The VREL® is
also cleanable in place. Both of these design factors
provide the advantages needed for consistent sample
conditioning.
Adjustable
When source pressures change, such as at startup and
shutdown, the VREL® can be easily adjusted to allow
continuous monitoring under all pressure conditions.

Heavy-duty
speed handle

www.sentry-equip.com

Cleanable in Place
Since corrosion products, scale, and other foreign
matter often find their way into sample lines, plugging
of the pressure reduction valve is common. This is
particularly true of Labrynth-type (Drag) valves, and
diaphragm-operated high pressure regulators. If these
valves plug, the sample line must be shut down while
the valve is removed for cleaning or replacement. If
the Sentry VREL® plugs with solids, the rods can be
fully retracted and the obstruction blown free without
disconnecting any lines. The analyzer can be returned
to service in minutes by operating personnel.
1.10.1 Rev. 17 08/12

element

t Extended-body design eliminates possibility of
bent tubes

VREL variab le p ressu re reducing

vrel®