Parr-instrument Pressure Relief Valves Bedienungsanleitung PDF herunterladen

Parr Instrument Company www.parrinst.com

Pressure Relief Valves

Operating Instructions

323M

Supplemental Protection

Although a safety rupture disc offers excellent protec-

tion against overpressure, it may be desirable in some

installations to supplement the rupture disc with a

spring-loaded relief valve, pre-set to open at a pres-

sure below the burst rating of the disk. Unlike rup-

ture discs, relief valves can be slightly higher that the

routine operating pressure and, since the valve will

reseal once the pressure falls below the relief setting,

valuable reactants will often be saved by this protec-

tive feature. Also, adding a relief valve will provide

positive protection for the pressure gage when using

gages less than 1000 psi since small diameter rupture

discs are not reliable at these lower pressures.

Two Different Styles

Parr spring-loaded relief valves are offered in two dif-

ferent styles, both with 1/4” NPT mounting threads.

They are commonly installed in the side port of the

gage adapter or by adding a 155VB street tee below

the pressure gage and attaching the relief valve to the

side opening on the tee, but other arrangements can

be used as well.

A140VB2 Values for Low Pressures

A140VB2 relief valves are offered in ﬁve ranges for

use at low pressures up to 600 psi. Since small diam-

eter rupture discs are not reliable at pressures below

1000 psi, adding a pre-set A140VB2 valve to a system

will protect low range pressure gages from acciden-

tal overpressure. The cracking pressure for A140VB2

valves is adjustable within the range prescribed for

each valve. To adjust the spring tension on the valve,

remove the green cap from the assembly. Remover

the outer locking screw with 5/32” Allen wrench.

Next, turn the inner 5/32” adjuster screw clockwise to

increase the cracking pressure, or counterclockwise

to lessen the cracking pressure. Replace the outer

locking screw until it comes in contact with the inner

screw. Place the green cap back onto the assembly.

A175VB Valves for High Pressures

A175VB relief valves are offered in multiple ranges

for pressures 50-5000 psi. When the upstream pres-

sure overcomes the force exerted by the spring in

these valves the poppet will open, allowing discharge

through a 1/4” NPT female opening to which extension

piping can be attached.

The cracking pressure in these valves is adjustable and

can be set by the user. To increase the cracking pres-

sure: release the lock nut under the adjustment cap

clockwise to increase the compression on the spring.

Figure 1

A140VB2

Figure 2

A175VB

Part No. Preset Psi Adj. Psi Bar

A140VB2PA 100 50-150 3.45-10.3

A140VB2P2 145 50-150 3.45-10.3

A140VB2P1 150 50-150 3.45-10.3

A140VB2PB 200 150-350 10.3-24.1

A140VB2PC 600 350-600 24.1-41.4

A140VB2PD 300 150-350 10.3-24.1

Part No. Adjustable Psi Bar

A175VB 750-1500 52-103

A175VB2 1500-2250 103-155

A175VB3 2250-3000 155-207

A175VB4 3000-4000 207-276

A175VB5 4000-5000 276-345

A175VB7 350-750 24-52

A175VB8 50-350 3.4-24.1

1 2

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Seite 1 - Operating Instructions

Parr Instrument Company www.parrinst.comPressure Relief ValvesOperating Instructions323MSupplemental ProtectionAlthough a safety rupture disc offers e

Seite 2

Pressure Relief ValvesParr Instrument Company 211 53rd Street • Moline, Illinois 61265 USA 1-309-762-7716 • 1-800-872-7720 • Fax: 1-309-762-9453 E-mai

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