Emerson Enardo 850 Series User Manual

5
850 and 950 Series
North America Only
• Cert. No. (Certicate Number) – Ex. 10273X
• Pressure
- Setting – Ex. Z4.0
- Flow Rate SCFH (Air) – Ex. 00000
• Vacuum
- Setting – Ex. Z0.5
- Flow Rate SCFH (Air) – Ex. 00000
Principle of Operation
850 and 950 Series
The 850 and 950 Series pressure/vacuum relief valves The 850 and 950 Series pressure/vacuum relief valves
maintain a tight seal until system pressure or vacuum maintain a tight seal until system pressure or vacuum
exceeds the set pressure of the valve. Set pressure exceeds the set pressure of the valve. Set pressure
is determined by stacking a series of weights onto the is determined by stacking a series of weights onto the
valve pallet unless the pressure and vacuum set points valve pallet unless the pressure and vacuum set points
have been specied for the minimum settings. When have been specied for the minimum settings. When
overpressure occurs, the weighted pallet lifts, breaking overpressure occurs, the weighted pallet lifts, breaking
the seal between the seat and pallet. This allows the seal between the seat and pallet. This allows
vapors to pass through the valve orice and relieve vapors to pass through the valve orice and relieve
pressure buildup. The valve reseals upon relief and pressure buildup. The valve reseals upon relief and
remains sealed.remains sealed.
It is important to know that relieving vapors near the It is important to know that relieving vapors near the
set pressure in a continuous manner may cause the set pressure in a continuous manner may cause the
pallet to utter or oscillate inside the valve chamber. pallet to utter or oscillate inside the valve chamber.
This is common to products of this type. Operating the This is common to products of this type. Operating the
valve with utter or oscillation may cause premature valve with utter or oscillation may cause premature
valve damage or wear over time. Enardo pressure/valve damage or wear over time. Enardo pressure/
vacuum relief valve ow charts and sizing program vacuum relief valve ow charts and sizing program
results designate the “utter zone” to assist with correct results designate the “utter zone” to assist with correct
valve sizing. valve sizing. Contact your local Sales O󰀩ce with any
questions or additional assistance.
Figure 6. Pressure and Vacuum Flow
PRESSURE FLOW VACUUM FLOW
Figure 5. Product Identification and Marking
OUTER HOUSING OF UNCOATED ALUMINUM
OUTER HOUSING OF STAINLESS STEEL,
CARBON STEEL OR COATED ALUMINUM
Smart Wireless Monitoring Operation
The Smart Wireless Monitored PVRV design consists
of the PVRV, proximity sensors and a wireless
transmitter. The built-in proximity sensors detect the
open or closed position of the valve stem and send
these signals to the transmitter. These signals received
by the transmitter can then be sent to a control room
via a WirelessHART Gateway.
WirelessHART is a wireless sensor networking
technology that is based on the Highway Addressable
Remote Transducer (HART) protocol. It was developed
as a multi-vendor, interoperable wireless standard for
process field device networks. It is the most widely
used standard today and, for this reason, the PVRV
described herein was designed to integrate within it.
As long as the wireless gateway is WirelessHART,
it will receive the signal from the device. The
WirelessHART gateway will then send the information
to a control room which makes use of any number of
software integration packages.

Emerson Enardo 850 Series Specifications

General

Brand	Emerson
Model	Enardo 850 Series
Category	Control Unit
Language	English