Emerson 1808 Series Relief Valve or Backpressure Regulators Datasheet download pdf

Bulletin 71.4:1808

July 2010

D100163X012







W3716



W3507



Figure 1. Types 1808 and 1808A Pilot-Operated Relief Valves or Backpressure Regulators



The Type 1808 globe-style and the Type 1808A

angle-style, pilot-operated relief valves or backpressure

regulators are economical, compact devices used in

gas or liquid service to maintain pressure on oil and gas

separators, and in pressure relief applications in gas

distribution systems. The Types 1808 and 1808A are

available with either a Type 6358 or 6358B pilot. The

Type 6358 pilot is used in gas or liquid backpressure

applications throughout the oil and gas production

industry. This pilot offers a low bleed construction so

it only bleeds when it is repositioning the main valve.

Pressure relief applications in the oil and gas industry

are typically handled by the Type 6358B pilot. This pilot

has a bleed restriction to reduce the buildup pressure

required to reach wide-open ow. These units control

pressures from 3 to 125 psig (0,21 to 8,6 bar), and the

set pressure is varied to individual requirements by

the adjusting screw on the pilot. On gas service, the

pilot exhaust can be piped into the downstream piping

or vented to atmosphere. On liquid service, the pilot

exhaust should be piped into the downstream piping or

to a safe location.



• —Units have fewer

parts for reliable service and minimum spare

parts inventory.

• —Less than 12-inches

(305 mm) tall and weighs 25 pounds (11 kg) or

less, these units are easily transported and installed

where space is limited.

• 

 —Pressure connection in diaphragm

casings and factory-piped pilot tubing mean

no upstream control line is required on standard

installations. There are no mounting restrictions to

limit service.

• —

Pilot exhaust port and standard tapped pilot spring

case (Figure 2) both come with removable vent for

remote piping when necessary. The standard

tapped pilot spring case comes complete with a

gasketed closing cap that permits pressure loading for

remote pneumatic adjustment of the set pressure.

1 2 3 4 5 6 7 8

Bulletin 71.4:1808 1

Summary of Contents

Page 1 - Bulletin 71.4:1808

Bulletin 71.4:1808July 2010D100163X012

Page 2

Bulletin 71.4:18082 • —With the removal of just two nuts, the upper and lower casings lift away, exposing the trim and le

Page 3

Bulletin 71.4:18083Figure 2. Type 1808 with 6358 Series Operational Schematic

Page 4

Bulletin 71.4:18084Table 4. Capacities(1)(2) for the Type 1808 Using Standard Internal Control Line and a Type 6358 or 6358B Pilot with High-Gain Res

Page 5

Bulletin 71.4:18085As long as inlet pressure remains below setpoint, the pilot spring keeps the pilot valve plug closed. Inlet

Page 6

Bulletin 71.4:18086

Page 7

Bulletin 71.4:18087(Select One) 1808 (globe body)*** 1808A (angle body)**(Select One) Cast iron*** WCC St

Page 8

Bulletin 71.4:1808The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owner

Emerson 1808 Series Relief Valve or Backpressure Regulators Datasheet

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Emerson 1808 Series Relief Valve or Backpressure Regulators Datasheet

Browse online or download Datasheet for Unknown Emerson 1808 Series Relief Valve or Backpressure Regulators. Emerson 1808 Series Relief Valve or Backpressure Regulators Data Sheet User Manual

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