Emerson ENARDO 860 Series Manuale utente

860 and 960 Series

February 2022

North America Only

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.

Enardo 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.

Introduction

Scope of the Manual

This Instruction Manual provides instructions

for installation, maintenance and parts ordering

information for the 860 and 960 Series spring-loaded

pressure/vacuum relief valve (SL-PVRV).

Figure 1. Model 860 Spring-Loaded Pressure/

Vacuum Relief Valve

Figure 2. Model 960 Spring-Loaded Pressure/

Vacuum Relief Valve

Instruction Manual

D103813X012

860 - X - - /

- -

/ -

960 - - - /

860 and 960 Series

North America Only

Specications

The Specications section on this page provides specications for the 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.

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

Pallet and Seat

Material

1 = PPS Polyphenylene

Sulde (max 5 psi)

2 = 316 Stainless Steel

(max 14.99 psi)

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)

Pressure 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

Vacuum Units

z = oz./sq.in.

n = in. w.c.

mm = mm w.c.

mb = mbar

p = psi.

Vacuum Setting

Maximum = 14.99 psig /

1034 mbarg

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

Inlet

Connection

Size

(2 through

6 in.)

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 psig)

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)

Pressure 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

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

Vacuum Units

z = oz./sq.in.

n = in. w.c.

mm = mm w.c.

mb = mbar

p = psi.

Vacuum Setting

Maximum = 14.99 psig /

1034 mbarg

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

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

Figure 3. Pressure/Vacuum Relief Valve Model Number

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

860 and 960 Series

North America Only

Product Description

The 860 and 960 Series spring-loaded pressure/

vacuum relief valves are designed to handle higher

pressure settings than standard dead weight-

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

aplications while 960 Series is used for vent-to-

atmosphere applications. Enardo 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 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.

• Model 860: Pressure/Vacuum Relief Valve -

Pipe-Away

• Model 861: Top Mount Pressure or Side Mount

Vacuum Relief Valve - Pipe-Away

• Model 960: Pressure/Vacuum Relief Valve -

Vent-to-Atmosphere

• Model 961: Pressure Relief Valve -

Vent-to-Atmosphere

• Model 962: Top Mount Vacuum Relief Valve -

End of Line

• Model 963: Side Mount Vacuum Relief Valve

MODEL 860 MODEL 861 MODEL 960

MODEL 961 MODEL 962 MODEL 963

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

II 1 G Ex h IIC T6 Ga

II 2 G Ex h IIC T6 Gb

860 and 960 Series

North America Only

Principle of Operation

The Enardo spring-loaded pressure/vacuum reliefThe Enardo spring-loaded pressure/vacuum relief

valve maintains a tight seal, until system pressure orvalve maintains a tight seal, until system pressure or

vacuum exceeds the set pressure of the valve. Setvacuum exceeds the set pressure of the valve. Set

pressure is established by the force of a spring or a setpressure is established by the force of a spring or a set

of multiple springs acting on the valve pallet. When theof multiple springs acting on the valve pallet. When the

system pressure is above the set pressure, the palletsystem pressure is above the set pressure, the pallet

starts to lift, breaking the seal between the seat andstarts to lift, breaking the seal between the seat and

pallet. This allows vapors to pass through the valvepallet. This allows vapors to pass through the valve

orice and relieve pressure buildup. The valve reseals orice and relieve pressure buildup. The valve reseals

upon relief and remains sealed.upon relief 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 Enardo Valve Sizing Program

displays the utter zone. Contact your local Sales

O󰀩ce with any questions or additional assistance.

Product Identication and Marking

Hazardous Locations

Enardo 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

OUTER HOUSING OF STAINLESS STEEL,

CARBON STEEL OR COATED ALUMINUM

OUTER HOUSING OF UNCOATED ALUMINUM

Figure 5. ATEX Certified Markings

Pressure Flow

Vacuum Flow

Pressure Flow

Vacuum Flow

860 and 960 Series

North America Only

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 Models 860,

960 and 962, the valve shipped from factory has

certain studs installed.

2. Orient valve in desired direction. 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.

PRESSURE FLOW VACUUM FLOW

Figure 6. Pressure and Vacuum Flow

860 and 960 Series

North America Only

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.

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.

860 and 960 Series

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 Enardo 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.

860 and 960 Series

North America Only

PIPE-AWAY SPRING-LOADED PRESSURE/VACUUM RELIEF VALVE

MODEL 860MODEL 860

MODEL 861 MODEL 963

MODEL 960 MODEL 960

MODEL 961 MODEL 962

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

Figure 7. 860 and 960 Series Common Valve Configurations

860 and 960 Series

North America Only

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.

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 860 Series pipe-away in-

line conguration or a 960 Series vent-to

atmosphere conguration.

SCREWS

TYPICAL

4 PLACES

HEX NUTS

TYPICAL

4 PLACES SCREWS

TYPICAL

3 PLACES

ENLARGED HOLES

WITH HEX NUTS

TYPICAL 3 PLACES

WING NUTS

TYPICAL

3 PLACES

2 AND 3 IN. RELIEF VALVES 4 AND 6 IN. RELIEF VALVES

Figure 8. 960 Series Pressure/Vaccum Relief Valves

860 and 960 Series

North America Only

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 860 Series Pipe-

Away Maintenance section on page 7.

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.

Figure 9. Weights on Pallet

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