Emerson Enardo 850 Series - Introduction

3
850 and 950 Series
North America Only
Failure to correct trouble could result in
a hazardous condition. Call a qualied
service person to service the unit.
Installation, operation and maintenance
procedures performed by unqualied
person may result in improper adjustment
and unsafe operation. Either condition
may result in equipment damage or
personal injury. Only a qualied person
shall install or service the pressure/
vacuum relief valve.
Figure 4. 850 and 950 Series Pressure/Vacuum Relief Valve Available Models
MODEL 850 MODEL 850/MVC MODEL 851
MODEL 950 MODEL 951 MODEL 952
MODEL 952/MVC
MODEL 953
Introduction
Scope of the Manual
This Instruction Manual provides instructions
for installation, maintenance and parts ordering
information for the 850 and 950 Series pressure/
vacuum relief valve (PVRV).
Product Description
850 and 950 Series
The 850 and 950 Series pressure/vacuum relief
valves provide protection against positive or vacuum
overpressure and prevent air intake and evaporative
losses of product while helping to contain odorous and
potentially explosive vapors.
The 850 Series provides pressure and vacuum relief in
applications that require hazardous vapors to be piped
away rather than released into the atmosphere.
The 950 Series valve provides pressure and vacuum
relief for normal venting requirements while maintaining
a safe internal working pressure to prevent the routine
expulsion of waste gas to the atmosphere.