Sentry VREL User Manual

6 Sentry Equipment Corp
Installing the VREL valve in a Panel
Isolate the sample line and make sure that it cannot be opened during installation of the VREL
valve. Failure to isolate the sample line could expose personnel to high pressure and/or hot
materials.
1. Drill holes in panel per Panel Cutout diagram in Figure 4.
2. Remove valve handle assembly by unscrewing head nut and pulling assembly out of
body.
3. Remove panel lock nut.
4. Insert body assembly from rear of panel using locating pin to position body.
 NOTE
Do not rely on the locating pin to hold the barrel assembly while tightening the head nut.
5. Install panel locknut. Pull up snug.
6. Insert rods into barrel. Be sure keyway on rod assembly lines up with key inside barrel.
Tighten head nut nger tight.
7. From the backside of the panel, use a wrench on the body nut to hold the body while
further tightening the head nut. It may require considerable torque to get a tight seal
on the metal-to-metal sealing surface inside the head nut.
8. The head nut must be fully tightened before the packing nut can be tightened or
loosened. Tighten packing nut with 15-20 ft-lb (20.3-27.1 Nm) of torque.
Connecting Sample Tubing
Isolate the sample line and make sure that it cannot be opened during installation of the VREL
valve. Failure to isolate the sample line could expose personnel to high pressure and/or hot
materials.
Three types of tube end congurations are available:
 Type 1: Plain end – 1/4" tubes with no connections for use with customer supplied
compression ttings.
 Type 2: Socket weld – socket weld ttings for customer’s 1/4", 3/8" or 1/2" tubing.
 Type 3: 37° Fitting - 37° metal to metal tting for customer’s 1/4" or 3/8" tubing.

Sentry VREL Specifications

General

Brand	Sentry
Model	VREL
Category	Control Unit
Language	English

Summary

Safety Information

Hazard Information Usage

Explains signal words for hazard communication, including Danger, Warning, Caution, and Notice.

Safety Definitions

Defines hazard signal words and notes used in safety alerts for clear understanding.

General Safety Precautions

Product Selection, Installation, and Use Guidelines

Emphasizes user responsibility for product selection, proper installation, and adherence to intended use.

Equipment Hazard Warnings

Warns about potential hazards like hot surfaces and high pressures, advising necessary precautions.

Overview

Installation Overview

Provides general installation guidelines and critical warnings for the Sentry VREL Control Valve.

Operation

Flow Adjustment Procedure

Details how to adjust the VREL valve's flow rate by turning the handle during operation.

In-Place Cleaning Procedure

Outlines procedures for cleaning the VREL valve to remove scale or foreign matter without disassembly.

Service

VREL Valve Replacement Parts

Lists available part numbers and items for the VREL valve, including seal kits and assemblies.

Standard Warranty

Customer Support