Emerson Yarway User manual

YARWAY BACK PRESSURE REGULATOR ¾” THRU 6”

INSTALLATION AND MAINTENANCE INSTRUCTIONS

Before installation these instructions must be fully read and understood

PRINCIPALS OF OPERATION

The Back Pressure Regulator (BPR) is used to

regulate the outlet pressure from modulating

high pressure let-down valves or pump bypass

valves when unregulated conditions would

cause flashing, cavitation, choked flow and

other undesirable two-phase flow effects.

Mounted between flanges, the regulator

is completely contained within the piping.

It consists of a spring-loaded plunger whose

motion opens a cylindrical flow passage in

the center of the regulator. Flow variations

cause the plunger to respond by increasing

or decreasing the open flow area. The spring

loading is set to maintain the liquid pressure in

the line at, or above, the level chosen to prevent

cavitation and two-phase flow in the let-down

valve and in the piping between the valve and

the regulator.

STORAGE

Inspect the regulator assembly as received

against the purchase specifications. The unit

was carefully prepared and supported for

shipment. Verify the satisfactory condition

of the unit and store it, if necessary, in the

shipping container in a dry enclosure.

UNPACKING

1. Remove from the shipping container.

If necessary, use a sling around the cylinder.

2. Observe and follow any caution and

instruction tags attached to the unit.

3. Protect the surfaces that serve as gasket

sealing from scratches, nicks or marks.

4. Inspect for and remove any external or

internal shipping restraints.

5. If, for any reason, the regulator has

been disassembled, contact Yarway and

then if so advised, follow the directions

under 'Maintenance' for disassembly and

assembly instructions.

Engineering doc. #965910 Rev. B

SPECIFICATIONS

Line sizes: ¾”, 1½”, 2”, 3”, 4”, 6”

Class: To 1500

Installation: Inserts into line between

flanges

Flange facings: Facings match the raised face

requirements of ANSI B16.5,

Class 300 through 1500

Pressure

differential: Selected for the application

See nameplate for the

operating differential pressure

FEATURES

• Prevents undesirable two-phase flow in

piping runs and in modulating valves.

• Reduces cavitation and erosion in

high pressure let-down valve trim.

Reduces noiselevel due to those effects.

• Stainless steel construction of all

operatingparts.

• Installed between flanges; no welding

or other procedures or preparation;

no external connections.

YARWAY BACK PRESSURE REGULATOR ¾” THRU 6”

INSTALLATION AND MAINTENANCE INSTRUCTIONS

FIGURE 1

* Same diameter as raised face to align and

center regulator in line except ¾” sizewhich

hasraisedface.

PARTS LIST

Item Part

1Seat

2Plunger guide

3O-ring

4Plunger

5Spring retainer

6Spring

7Seal

8Retaining ring

9Washer

10 Draw bolt

11 Spacer

CAUTION

The Back Pressure Regulator has an internal

spring and if the draw bolt is removed, it should

be done carefully.

OPERATION

During pump tests and/or let-down valve tests,

observe the pressure in the pipe line ahead

of the regulator under a variety of conditions.

Check that the pressure specifications are

met under flow conditions. Contact Yarway

immediately if there are any questions

regarding performance.

Following the operational checks above, make

periodic performance checks when convenient

by noting the inlet pressure and comparing

itwith previous observations.

MAINTENANCE

There are no routine maintenance procedures

for the Back Pressure Regulator.

DISASSEMBLY / SERVICE / REASSEMBLY

Before any service starts, pressure must be

relieved and flow to the regulator must be

blocked. Pressure or vacuum downstream

must be relieved. If connection is made

into andbelow the water level in a tank, the

tank must be drained below the regulator

connection. If possible, allow time for cooling

of elevated temperatures to prevent injury

duetopossible contact.

Disassembly

Loosen the flanged joint holding the regulator.

Remove the regulator from the pipe. Place the

regulator on wood blocks or other clean, flat

wooden surface. Do not mark or scratch the

gasket sealing surfaces. To disassemble the

regulator:

Carefully drill out the stake mark with a small

drill. Remove orifice (¾” only). Install draw bolt

and washer (see Table A for sizes) and tighten

until “snug” (torque = 5 to 10 ft·lb). Loosen

retaining ring (clockwise) approximately one

turn and remove spiral ring. The BPR unit can

now be removed as an assembly. Use a soft

metal rod to drive assembly in same direction

as flow arrow.

INSTALLATION

The Back Pressure Regulator is mounted and

clamped between flanges. A typical installation

is shown in Figure 1. It is important that the

regulator be mounted in the correct flow

direction; flow arrow is on nameplate.

Upstream piping should be flushed to

removeall foreign objects before the

regulatoris installed.

Insert the regulator into the pipe. Support and

center the regulator on the raised face on the

flanges per Figure 1. Secure the joint using

standard assembly procedures.

A pressure tap with a valve and pressure

gage, located in the line between the let-down

valve outlet and the inlet to the regulator, is

desirable. Size the gage for the maximum

pressure it could sense, usually taken as

thatatthe inlet of the let-down valve.

62 137

¾”-1½” 10-24 3½” 1½” 1

16”7

32”1

16”

2” ¼-20 4” 1½” 1⅜” 9

32”1

16”

3” ¼-20 5½” 1¾” 2

16”9

32”⅛”

4” 5

16-18 7” 2¼” 2⅞” 11

32”⅛”

6” ⅜-16 7½” 3” 4½” 13

32”⅛”

¾”-1½” 1⅛-12 20-25 (27-34)

16-12 45-55 (61-75)

32⅛-12 100-120 (136-163)

42⅞-12 180-220 (244-298)

64¾-12 300-340 (406-460)

YARWAY BACK PRESSURE REGULATOR ¾” THRU 6”

INSTALLATION AND MAINTENANCE INSTRUCTIONS

TABLE A

BPR

size

Bolt

thread

Bolt

length

Min. thread

length

Washer

O.D.

Washer

I.D.

Washer

thickness

Regulator size Nut size

Torques

ft·lb (Nm)

PARTS LIST

Item Part

1Body

2Capsule assembly

3Spiral ring

4Nameplate

5Drive screw

6Orifice

7Raised face adapter

¾” SIZE 1½” - 6” SIZE

The unit is reassembled and ready for installation. Keep it clean and free of foreign matter and objects.

Reassembly

Place regulator flange face down.

• Lubricate O-ring with O-ring lubricant and

install BPR capsule into body.

Use the following lubricants or their

equivalents:

- Anti-seize: Never-Seez NS 165

(pure nickel special).

- O-ring: P-80 rubber lubricant or liquid soap

(International Products Corp.).

Service

The internal parts are replaced as a calibrated

capsule assembly and are not available as

individual parts.

• Install spiral ring into body groove

(lubricatebottom side with anti-seize).

• Prep exposed plunger guide threads with

Loctite Grade T Primer; coat with Loctite 272

(thread locking adhesive). Back retaining ring

out to load BPR capsule with required torque.

Remove and discard draw bolt and washer

(used to hold the capsule assembly together).

Stake plunger guide into retaining ring; do not

stake toward centerline of BPR. Install orifice

(torque = 15-20 in·lb). Recommend new orifice

when installing new assembly. Orificeis used

on ¾” size only.

YARWAY BACK PRESSURE REGULATOR ¾” THRU 6”

INSTALLATION AND MAINTENANCE INSTRUCTIONS

TROUBLESHOOTING AND DIAGNOSIS

Symptom Probable cause Corrective action

Sudden pressure loss Object holding piston open Increase flow rate and flush object through

Disassemble and remove object. See 'Disassembly / Service / Reassembly'

Long term pressure loss Orifice enlargement Recondition

Piston leading edge worn Recondition

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