Emerson ENARDO 860 Series Manuel utilisateur

Enardo 860 and 960 Series Spring-Loaded

Pressure/Vacuum Relief Valve (ATEX Approved)

Table of Contents

Introduction..................................................................1

Specifications .............................................................. 2

Product Identification and Marking .............................. 4

Principle of Operation.................................................. 4

Installation ...................................................................5

Maintenance................................................................9

Weight Information .................................................... 11

Valve Repair .............................................................. 11

▲ WARNING

Failure to follow these instructions or

to properly install and maintain this

equipment could result in an explosion,

re and/or chemical contamination

causing property damage and personal

injury or death.

Fisher™ spring-loaded pressure/vacuum

relief valve must be installed, operated

and maintained in accordance with

federal, state and local codes, rules

and regulations, and Emerson Process

Management Regulator Technologies

Tulsa, LLC (Emerson) instructions.

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 spring-loaded pressure/

vacuum relief valve.

Figure 1. Enardo Model 860 Spring-Loaded Pressure/

Vacuum Relief Valve

Figure 2. Enardo Model 960 Spring-Loaded Pressure/

Vacuum Relief Valve

Introduction

Scope of the Manual

This Instruction Manual provides instructions for

installation, maintenance and parts ordering information

for the Enardo 860 and 960 Series spring-loaded

pressure/vacuum relief valve (SL-PVRV).

Instruction Manual

D103814X012

February 2022

Enardo 860 and 960 Series

Outside North America Only

Specications

The Specications section on this page provides specications for the Enardo 860 and 960 Series spring-loaded

pressure/vacuum relief valve. Specication is stamped on the nameplate attached to the relief valve. Refer to

Product Identication and Marking section for the nameplate details.

Available Construction

See Figure 3

Inlet Connection Sizes

2 through 6 in. / 50 through 150 mm

Pressure Ranges(1)(2)

0.5 to 15.0 psi

0.5 to 32.0 oz./sq. in.

1.0 to 55.0 in. w.c.

2.0 to 138 mbar

Vacuum Pressure Ranges(1)(2)

0.5 to 15.0 psi

0.5 to 32.0 oz./sq. in.

1.0 to 55.0 in. w.c.

2.0 to 138 mbar

Construction Materials

Housing: Aluminum, Stainless steel or Carbon steel

Seat / Pallet: Polyphenylene Sulde (PPS) or 316

Stainless steel (standard above 5 psi)

Pallet Seal: Buna-N, FEP Teon®or Viton®

Hardware: Zinc plated carbon steel or Stainless steel

Weights: Zinc plated carbon steel, Stainless steel

or Lead

Gaskets: Buna-N, Teon®or Viton®

Certication

EN IEC 60079-0:2018

EN IEC 60079-11:2012

EN ISO 80079-36:2016

EN ISO 80079-37:2016

1. The pressure limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.

2. Pressure or vacuum setting has an increment of 0.5 psi, 0.5 oz./sq. in., 0.5 in. w.c. or 2.2 mbar.

Teon®and Viton®are marks owned by E. I. du Pont de Nemours and Co.

Figure 3. Pressure/Vacuum Relief Valve Model Number

ENARDO MODEL 860 SPRING-LOADED PRESSURE/VACUUM RELIEF VALVE MODEL NUMBER

ENARDO MODEL 960 SPRING-LOADED PRESSURE/VACUUM RELIEF VALVE MODEL NUMBER

Inlet

Connection

Size

(2 through

6 in.)

Inlet

Connection

Size

(2 through

6 in.)

Outlet

Connection

Size

(3 through

8 in.)

Housing Material

1 = Aluminum

4 = 316 Stainless

Steel

5 = Carbon Steel

Housing Material

1 = Aluminum

4 = 316 Stainless

Steel

5 = Carbon Steel

Pallet and Seat

Material

1 = PPS Polyphenylene

Sulde (max 5 psi)

2 = 316 Stainless steel

(max 14.99 psi)

Pallet and Seat

Material

1 = PPS Polyphenylene

Sulde (max 5 psi)

2 = 316 Stainless steel

(max 14.99 psig)

Pallet Seal

Material

1 = FEP

2 = Nitrile (NBR)

3 = Fluorocarbon

(FKM)

Pallet Seal

Material

1 = FEP

2 = Nitrile (NBR)

3 = Fluorocarbon

(FKM)

Body/Seat/Lid Seal

Material

1 = PTFE Body and

FEP Seat/Lid

2 = Nitrile (NBR)

3 = Fluorocarbon

(FKM)

Body/Seat/Lid Seal

Material

1 = PTFE Body and

FEP Seat/Lid

2 = Nitrile (NBR)

3 = Fluorocarbon (FKM)

Pressure Units

z = oz./sq.in.

n = in. w.c.

mm = mm w.c.

mb = mbar

p = psi

Pressure Units

z = oz./sq.in.

n = in. w.c.

mm = mm w.c.

mb = mbar

p = psi

Vacuum Units

z = oz./sq.in.

n = in. w.c.

mm = mm w.c.

mb = mbar

p = psi

Vacuum Units

z = oz./sq.in.

n = in. w.c.

mm = mm w.c.

mb = mbar

p = psi

Pressure Setting

Maximum = 14.99 psig /

1034 mbarg

Pressure Setting

Maximum = 14.99 psig /

1034 mbarg

Vacuum Setting

Maximum = 14.99 psig /

1034 mbarg

Vacuum Setting

Maximum = 14.99 psig /

1034 mbarg

Weight Material

C = Carbon Steel

Zinc-Plated

S = 316 Stainless steel

L = Lead

Weight Material

C = Carbon Steel

Zinc-Plated

S = 316 Stainless steel

L = Lead

Options

0 = No Options

F = Flat Face Flange (standard for Aluminum)

R = Raised Face Flange (standard for CS, DI, SS)

X = Epoxy

Options

0 = No Options

F = Flat Face Flange (standard for Aluminum

R = Raised Face Flange (standard for CS, DI, SS)

X = Epoxy

ENARDO 860 -

ENARDO 960 -

X - - /

- - /

- -

/ -

Enardo 860 and 960 Series

Outside North America Only

Product Description

The Enardo 860 and 960 Series spring-loaded

pressure/vacuum relief valves are designed to handle

higher pressure settings than standard dead weight-

loaded valves.The Enardo 860 Series is used for pipe-

away aplications while Enardo 960 Series is used for

vent-to-atmosphere applications. Fisher spring-loaded

line are designed for pressures up to 15 psig for tanks

with higher maximum allowable working pressures.

With proper installation, usage and preventative

maintenance, the Enardo 860 and 960 Series can

supply many years of pressure/vacuum relief with

continuous sealing abilities that exceed the most

stringent industry standards (1 SCFH at 90% set

point per valve). Spring-loaded pressure/vacuum

relief valves have the option of weight-loaded pallets

in either the vacuum or pressure portion of the valve.

The following is the list of the available spring-loaded

pressure/vacuum relief valve models. See Figure 4.

• Enardo Model 860:

Pressure/Vacuum Relief Valve - Pipe-Away

• Enardo Model 861: Top Mount Pressure or Side

Mount Vacuum Relief Valve - Pipe-Away

• Enardo Model 960:

Pressure/Vacuum Relief Valve - Vent-to-Atmosphere

• Enardo Model 961:

Pressure Relief Valve - Vent-to-Atmosphere

• Enardo Model 962:

Top Mount Vacuum Relief Valve - End of Line

• Enardo Model 963: Side Mount Vacuum Relief Valve

Figure 4. Enardo 860 and 960 Series Spring-Loaded Pressure/Vacuum Relief Valve Available Models

ENARDO MODEL 860 ENARDO MODEL 861 ENARDO MODEL 960

ENARDO MODEL 961 ENARDO MODEL 962 ENARDO MODEL 963

Enardo 860 and 960 Series

Outside North America Only

Product Identication and Marking

Hazardous Locations

Fisher™ spring-loaded pressure/vacuum relief valves

are available with outer housings of carbon steel,

stainless steel or aluminum, as indicated in Figure 5.

Nameplate

A nameplate is attached to the valve and contains the

following information:

• Model Number – Ex. 860- 3X4-4211

• Conn. Flange Size and Rating – Ex. 3 in.

• Serial Number

• Tag Number (Optional)

• Notied Body Number – Ex. 2460

• Cat. No. (Category Number) –

Ex. -

Category 1 - Stainless steel, Carbon steel or

Coated Aluminum vents

Category 2 - Uncoated Aluminum vents

• Date – Date of Manufacture

• Certicate – Ex. PRESAFE 17 ATEX 10273X

• Pressure

- Setting – Ex. Z4.0

- Flow Rate SCFH (Air) – Ex. 55000

• Vacuum

- Setting – Ex. Z0.5

- Flow Rate SCFH (Air) – Ex. 25000

Principle of Operation

The Fisher spring-loaded pressure/vacuum relief valveThe Fisher spring-loaded pressure/vacuum relief valve

maintains a tight seal, until system pressure or vacuummaintains a tight seal, until system pressure or vacuum

exceeds the set pressure of the valve. Set pressure isexceeds the set pressure of the valve. Set pressure is

established by the force of a spring or a set of multipleestablished by the force of a spring or a set of multiple

springs acting on the valve pallet. When the systemsprings acting on the valve pallet. When the system

pressure is above the set pressure, the pallet starts topressure is above the set pressure, the pallet starts to

lift, breaking the seal between the seat and pallet. Thislift, breaking the seal between the seat and pallet. This

allows vapors to pass through the valve orice and allows vapors to pass through the valve orice and

relieve pressure buildup. The valve reseals upon reliefrelieve pressure buildup. The valve reseals upon relief

and remains sealed.and remains sealed.

Relieving vapors near the set pressure in a continuous

manner may cause the pallet to utter or oscillate inside

the valve chamber. This is common to products of this

model. Operating the valve with utter or oscillation may

cause premature valve damage or wear over time. The

utter zone typically begins at the set point and ends at

the ow rate associated with 10% overpressure. The

Fisher Valve Sizing Program displays the utter zone.

Contact your local Sales O󰀩ce with any questions or

additional assistance.

Figure 5. ATEX Certified Markings

OUTER HOUSING OF STAINLESS STEEL,

CARBON STEEL OR COATED ALUMINUM

OUTER HOUSING OF UNCOATED ALUMINUM

II 1 G Ex h IIC T6 Ga

II 2 G Ex h IIC T6 Gb

Enardo 860 and 960 Series

Outside North America Only

2. Orient valve in desired direction. Enardo

Models 860 and 861 require the pipe-away

connection ange to be properly oriented before

the base is bolted down.

3. After the valve has been properly aligned, install nuts

and bolts. Tighten the bolts down in a cross-hatched

pattern. Ensure the valve is securely fastened.

Installation

△ CAUTION

Ensure the tank is at atmospheric pressure

before opening. A pressure build-up inside

the tank can cause a spray to be emitted

from the valve if opened under pressure.

Springs are energy storage devices and

are dangerous if handled improperly.

Never loosen any nuts or cap screws

until all spring preload has been relieved.

Always use appropriate safety equipment

including safety glasses or shields any

time you are working with a spring-

loaded valve.

Installing Pressure/Vacuum Relief Valves

with Only Spring-Loaded Pallets

1. Attach the valve to the appropriate mating ange

using a proper gasket. To ensure proper function,

install the valves to a level horizontal surface

so the pallet will move vertically. For Enardo

Models 860, 960 and 962, the valve shipped from

factory has certain studs installed.

Figure 6. Pressure and Vacuum Flow

PRESSURE FLOW VACUUM FLOW

Pressure Flow

Vacuum Flow

Pressure Flow

Vacuum Flow

Enardo 860 and 960 Series

Outside North America Only

3. Separate the protective cardboard coverings from

the pallets. Be careful not to damage the pallet

seal surface.

4. Reinsert uncovered valve pallets back into the

unit. Make sure the lower stem on the pallet is

centered into the valve seat. If the pallet appears

to be o󰀨 center to the valve chamber, or if there

is di󰀩culty positioning the lid or guide, carefully

inspect the pallet to ensure it is inserted properly.

Installing Pressure/Vacuum Relief Valves

with Weight-loaded Pallets

Note

The following steps 1 to 7 apply only to

valves that have a weight-loaded vacuum

or pressure pallet. These steps do not

apply to pallets that are spring-loaded on

both the pressure and vacuum sides.

1. If the valve has a weight-loaded vacuum, loosen

fasteners on top of the valve and remove the lid,

hood or guide.

2. Remove valve pallets from the unit.

Enardo 860 and 960 Series

Outside North America Only

5. To adjust valve settings higher than minimum,

use the weights included with the shipment to

increase the pressure setting. Weights are packed

separately within the unit shipping package and are

labeled “PRESSURE” and/or “VACUUM”. If weights

are shipped with the unit, they should be installed

onto the pallets in the valve chamber in which they

are labeled. Gently slide the weights onto the pallet

stem and down on top of the valve pallet.

6. Replace any lid, hood or guide that was previously

removed, and fasten securely. When tightening

down lids, make sure the O-ring in the lid has full

contact with the sealing surface.

7. Attach the valve to the appropriate mating ange

using proper gasket. To ensure proper function,

install the valve to a level horizontal surface so the

pallet will move vertically. Units that are tilted during

usage may su󰀨er premature damage or wear.

For more details on using weights to adjust the pallet

setting, refer to the Weight Information section.

Note

Before using your new Fisher™ pressure/

vacuum relief valve, make sure that your

valve is properly set for the appropriate

pressure and vacuum settings. Early or

delayed relief could be dangerous and/or

expensive depending on the application.

Spring–loaded valves are set at the

factory. Additional adjustment should not

be required and is not recommended.

Enardo 860 and 960 Series

Outside North America Only

Figure 7. Enardo 860 and 960 Series Common Valve Configurations

PIPE-AWAY SPRING-LOADED PRESSURE/VACUUM RELIEF VALVE

VENT-TO-ATMOSPHERE SPRING-LOADED PRESSURE/VACUUM RELIEF VALVE

ENARDO MODEL 860

SPRING LOADED PRESSURE/

SPRING LOADED VACUUM

SPRING LOADED PRESSURE/

SPRING LOADED VACUUM

SPRING LOADED PRESSURE/

SPRING LOADED VACUUM

ADAPTER

COVER

SPRING LOADED VACUUM

WEIGHT LOADED PRESSURE/

SPRING LOADED VACUUM

WEIGHT LOADED PRESSURE/

SPRING LOADED VACUUM

ENARDO MODEL 861

ENARDO MODEL 860

ENARDO MODEL 963

ENARDO MODEL 960

ENARDO MODEL 961

ENARDO MODEL 960

ENARDO MODEL 962

Enardo 860 and 960 Series

Outside North America Only

Maintenance

▲ WARNING

Ensure the tank is at atmospheric pressure

before opening or removing a valve.

Pressure build-up inside the tank can

cause a spray to be emitted from the valve

if opened under pressure.

Springs are energy storage devices and

are dangerous if handled improperly.

Never loosen any nuts or screws until

all spring preload has been relieved.

Instructions for removing spring preload

are provided in this section. Always use

appropriate safety equipment including

safety glasses or shields any time you are

working with a spring-loaded valve.

Determine if the pressure/vacuum relief valve

assembly is an Enardo 860 Series pipe-away

in-line conguration or an Enardo 960 Series vent-to

atmosphere conguration.

Enardo 860 Series Pipe-Away

See Figure 8 for reference.

1. Remove the cylindrical cap(s) from the lid(s) by

removing the small screws.

2. Turn the spring plunger clockwise to remove all

spring preload. Note the number of turns the

plunger has been turned to facilitate reassembly.

3. Remove the hex bolts holding the lid to the body

and lift o󰀨 the lid.

△ CAUTION

If the lid shows signs of any remaining

spring preload, do not continue with

the disassembly until this condition is

corrected. If the cap screws seem to be

under a load or if the lid starts to rise as

the cap screws are loosened, the spring

is still under load.

Figure 8. Enardo 960 Series Pressure/Vaccum Relief Valves

2 AND 3 IN. RELIEF VALVES

HEX NUTS

TYPICAL

4 PLACES

SCREWS

TYPICAL

4 PLACES

4 AND 6 IN. RELIEF VALVES

SCREWS

TYPICAL

3 PLACES

ENLARGED HOLES

WITH HEX NUTS

TYPICAL 3 PLACES

WING NUTS

TYPICAL

3 PLACES

Enardo 860 and 960 Series

Outside North America Only

4. The valve contains a single spring or a multiple

nested spring arrangement. Inspect the springs and

other internal parts for signs of deterioration and/or

corrosion. Replace any worn or damaged parts.

5. Remove any valve pallets and weights from the

unit if so equipped. Keep in mind that these will be

reinstalled, so keep track of the chamber from which

they were removed.

6. Inspect the pallets for any damage and/or buildup

that may a󰀨ect its sealing characteristics or its ability

to move properly inside the valve. If necessary, gently

clean the pallet and seal with a suitable solvent and

nonabrasive cloth.

7. Clean the removed parts with a suitable solvent.

8. Inspect the valve seats installed in the unit. The

sealing surfaces should be smooth and free of nicks

or buildup. Check the guides for anything that may

keep the valve pallet from moving properly inside

the valve. If necessary, gently clean the seats with a

suitable solvent and nonabrasive cloth.

9. If lid is available on the valve, clean any buildup that

may exist in or around the guide hole located in the

center of the part.

10. If the valve is tted with a screen of some type,

clear away any blockage that may impede

proper ow.

11. Reassemble the valve in reverse order

from disassembly.

12. Make sure the lower stem on the pallet is centered

into the valve seat. If the pallet appears to be o󰀨

center to the valve chamber, or if there is di󰀩culty

positioning the lid or guide, the pallet may be

inserted improperly.

13. Adjust the spring preload by returning the spring

plunger to its factory set location as noted earlier

or install on a pressure test stand and adjust to the

desired setting.

Enardo 960 Series Vent to Atmosphere

See Figures 8 and 9 for reference.

1. For 4 and 6 in. valves, remove the cylindrical cap(s)

from the lid(s) by removing the small screws.

2. Remove the hood by removing the wing nuts or

screws holding it in place. Hood can be removed

without releasing spring preload, but do not

remove the hex nuts until the spring preload has

been removed.

3. Follow steps 2 to 13 from the Enardo 860 Series

Pipe-Away Maintenance section on page 7.

Figure 9. Weights on Pallet

Enardo 860 and 960 Series

Outside North America Only

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