Hawido 1401 Manual de usuario

HAWIDO - REGULATING VALVES

Instruction for

Pressure relief and pressure retention valve

with backflow prevention

Type 1401

ND40 –ND200

Keep this instruction manual at the location of the valve!

Example of rating plate

After the commissioning, enter the following data and make use of this additional information regarding the

valve type, pressure and flow ratios when consulting the manufacturer or the supplier or asking them questions:

Serial number: ................................................... DN ……………… PN: …………………..

Year of manufacture:...................................................

Anleitung Stand September 2018 - 1/plü Subject to technical changes!

 -1- 
 
CONTENTS 
 
A. DESCRIPTION 2 
FUNCTION 2 
GENERAL SAFETY INSTRUCTIONS 2 
RECOMMENDED INSTALLATION 3 
B. COMMISSIONING 4 
FUNCTIONAL DIAGRAM (1401) 4 
PREPARATORY WORK 4 
VENTING 5 
ADJUSTMENTS 5 
SETTING THE REACTION SPEED 6 
CHECK FUNCTION 6 
CHECKING FOR LEAKAGE 6 
C. FAULT FINDING 7 
D. PUTTING OUT OF SERVICE AND MAINTENANCE 8 
PUTTING OUT OF SERVICE 8 
MAINTENANCE AND SERVICE 8 
1 GENERAL INFORMATION 8 
2 ANNUAL FUNCTIONAL CHECKS 8 
3 4TO 5-YEAR MAINTENANCE 9 
REPAIR KITS AND SPARE PARTS 10 
1 BASE VALVE DN 40 TO DN 200 (DRAWING)11 
2 MAIN VALVE (PARTS LIST)12 
3 DAV STAINLESS STEEL CONTROL VALVE DN 3/8" PN 10/16/25 (DRAWING)14 
4 DAV STAINLESS STEEL CONTROL VALVE DN 3/8" PN 10/16/25 (PARTS LIST)15 
5 CONTROL LINE INDIVIDUAL PARTS AND ACCESSORIES 16 
6 OPTICAL POSITION INDICATOR (DRAWING)21 
7 OPTICAL POSITION INDICATOR (PARTS LIST)22 
E. ANNEX 23 
TORQUES 23 
F. HAWLE IN EUROPE 24 
 
 

-2-

A. Description

1. Function

The pressure relief valve maintains constant a pre-set inlet pressure (p1). Any excess system pressure is

relieved by fast opening of the valve. The closing procedure is slow in order to avoid shock pressure loads.

Variable flow rates have no effect on the maintained pressure which is regulated by the control valve. The

overpressure or maintained pressure of the standard version can be set within the range of 1.5 bar to 12 bar.

The valve closes if a backflow enters the system (p2 is greater than p1)

Technical features:

Medium: Drinking water

Pressure stages: PN 10 (from DN 200 Standard)

PN16 (up to DN150 Standard)

PN25

Flanges: Connection dimensions according to DIN EN 1092 - -2

Pressure gauge EN 837-1, Accuracy class 1.6

Main valve material: EN-GJS-400-15

Temperature range: 2 –40 °C

2. General safety instructions

These instructions must be read through carefully and understood before starting the commissioning.

Damage to property and injuries to persons could occur as a result of improper installation, commissioning,

operation and maintenance.

The Hawle regulating valve (HAWIDO) has been designed for use in drinking and process water supplies.

Other application media only after consultation with the manufacturer.

The technical regulations (e.g. SVGW, ÖVGW, DVGW...) and codes of practice (e.g. VDE, VDI ...), laws and

standards are taken as a minimum standard, and must be adhered to and applied.

Work on electrical installations (e.g. installation of magnetic position switches, solenoid valves, etc.) may only

be carried out by personnel authorised for this work.

In principle, the responsibility for the layout, the installation position, the installation and the commissioning of

the fittings in the pipe work lies with the designer, the installation company and/or the operator. Design or

installation errors can adversely affect the safe operation of the regulating valve, and can represent a

significant risk. Please consult us in case of doubt.

-3-

3. Recommended installation

Before the installation of the fitting, the pipe lines must be carefully blown or flushed through to prevent any

foreign material, such as pieces of wood, stones etc., from entering the regulating valve.

The HAWIDO must be installed horizontally with the valve cover upwards (other models available on

request). We recommend that a gate valve and a dirt trap be fitted in front of the valve, as well as the

mounting of an gate valve at the outlet.

If the HAWIDO 1400 is used as a safety valve the shutoff gate valve on the outlet side can be omitted.

Before the installation, check that no coarse foreign objects can penetrate into the HAWIDO.

Please contact us for other types of installation.

04.06.2013/plü

-4-

B. Commissioning

1. Functional diagram (1401)

Components

1 Main valve 1200

2 Ball valve (A, B, C)

3 Filter

4 Orifice plate

5 One-way flow restrictor (A, B)

6 Control valve

7 Pressure gauge

8 Position indicator Electrical position

indicator (optional)Valve opening

limiter (optional)

9 Check valve (A, B)

2. Preparatory work

Before commissioning the valve, check that the gate valves on the inlet and outlet sides of the valve are

closed and that the flange connections have been correctly tightened and sealed.

On the valve:

•Open ball valves (2A and 2B) and loosen the set screw lock nut on the one-way flow restrictor (5)

•Unscrew the adjusting screw on the one-way flow restrictor (5) by approximately 10 turns. (The line

to the control chamber is open).

•Close the ball valve (2C)

•Loosen the threaded pin in the central plug on the position indicator by a few turns.

•Loosen the threaded pin in the venting elbow by a few turns.

Threaded screw in the venting elbow

Vent hole

•Lower the adjusting lever on the pressure retention control valve (6) and turn the lever to the right

until a very high resistance is felt from the spring.

3 4

p1p2

2A 2C

72B

-5-

3. Venting

Procedure:

Slowly open the inlet gate valve on the inlet side until water flows into the valve. The valve fills with water

and the air escapes through the open vent holes.

When all the air has been expelled by venting the valve in the control line, re-tighten the threaded pin. Check

that all the screw connections are properly sealed, and re-tighten if necessary.

Slowly open the inlet gate valve completely.

Check: If the shut-off gate valve on the outlet side is slightly opened, the valve should close or remain

closed. Then close the shut-off gate valve again.

If the valve does not close, the commissioning procedure must be repeated from the previous chapter.

Particular care must then be taken to ensure that the upper valve chamber and control lines are properly

vented.

4. Adjustments

Prepare the valve according to Chapters 2 and 3. The gate valves on the inlet and outlet side are closed.

Procedure:

•Slowly open the ball valve (2C)

•Gradually and slowly open the gate valve on the outlet side.

•Slowly turn the hand wheel of the control valve (6) to the left until the valve opens (audible sound of

water flowing).

•Check the inlet pressure on the pressure gauge.

•Gradually turn the hand wheel of the control valve (6) (½ turn) according to the table below.

Note:

Wait for the hydraulic system to stabilise between each half turn of the hand wheel. If the required relief

pressure has been set, tighten the screw on the hand wheel of the control valve (6).

Spring

type

Marking

Regulating

pressure

Pressure

change for 1

turn [bar]

Number of

spindle turns

for p = 1bar

Standard

NONE

1.5 –12bar

0.4

2.5

Strong

yellow

10 - 22bar

0.9

1.1

Weak

blue

0.2 –5bar

0.08

12.6

-6-

5. Setting the reaction speed

If the HAWIDO does not operate quietly, or if pressure shocks occur in the supply network, this can be

corrected by the corresponding adjustment of the one-way flow restrictor (4).

Procedure:

Loosen the locknut. Screw in the set screw clockwise with a screwdriver until the valve operates quietly.

Then retighten the locknut.

Caution: The setting screw must always remain at least 4 - 5 turns open, otherwise the valve will not reopen

after the closing sequence.

6. Check function

The valve closing speed can be set on the check valve (9) with a volume backflow (p2 greater than p1).

The check valve (9) must be open by at least one turn.

7. Checking for leakage

The HAWIDO's are tested at the factory for both leakage and function before delivery. When checking for

leakage under operational conditions, particular attention must therefore be given to the seals of the flange

connections, the control line and the central plug screw on the valve cover. Where necessary, ensure the

seal by retightening the connections.

-7-

C. Fault finding

Symptoms

Possible cause

Action

Valve does not open

One-way flow restrictor blocked

Replace or unscrew the set

screw several times until the

valve functions properly

One-way flow restrictor closed

too far

Unscrew the set screw until the

valve functions properly

Valve does not open

(Pressure retention)

Control valve screw over-

tightened (pressure set too

high)

Loosen the set screw. Reset the

pressure (see Chapter 6)

Valve does not close

One-way flow restrictor blocked

Replace, or screw the set screw

fully in and out several times

and then re-set

Filter in the control line blocked

Clean the filter

Air in the control line / upper

valve chamber

Vent

Foreign matter in the main valve

Carry out service and remove

any foreign matter

Diaphragm defective

Carry out a service.

Replace the diaphragm

Valve spindle jammed by

encrustation

Carry out service and remove

any encrustation

Valve does not close

Check valve closed

open

One-way flow restrictor blocked

Replace or unscrew the set

screw several times until the

valve functions properly

Loud noise

Unfavourable operating

conditions

Change pressure by approx. 0.1

to 0.2 bar. Slightly open or close

the one-way flow restrictor.

Contact the Hawle Customer

Service department.

Wrong valve size

Have the correct valve size

calculated (contact Hawle)

Erratic operation

One-way flow restrictor

incorrectly set

Set according to Chapter 5

Original pressure values not

reached

Pressure gauge faulty

Check or replace pressure

gauge

Changed operating conditions

Reset (see Setting-up

paragraph)

EWS coating damaged

Transportation damage,

installation damage

Repair with Hawle two-

component repair set for

coatings

-8-

D. Putting out of service and maintenance

1. Putting out of service

The operating valve must first be shut off hydraulically by proceeding as follows:

•Slowly close the gate valves before and after the valve

•Slowly close the ball valves (2A, 2B, 2C).

The valve has now been taken out of operation, and a service can be carried out.

2. Maintenance and service

2.1 General information

Through our many years of experience with diaphragm valves that are controlled by the flow medium, we

know that our HAWIDOs normally function trouble-free for many years. Regular maintenance is a

precondition for this, however.

Under normal operating conditions, the following should be carried out:

•The valve should be checked for correct operation once a year (functional check)

•The dirt trap upstream of the valve and the filter in the control line should be cleaned once a year

•The inner working components should be checked and worn parts be replaced every four to five

years (maintenance).

Under unusual operating conditions (e.g. with water which contains quantities of suspended matter, very

high pressure reduction, small flow rates etc.), maintenance should be carried out more frequently.

Maintenance sign:

xx stands for the respective year.

2.2 Annual functional checks

Cleaning the dirt trap in the main line

•Unscrew the lid

•Clean the filter with a brush or cloth, or replace it

•Install the filter and screw the lid back on

Cleaning the filter in the control line

•Unscrew the lid of the filter

•Clean the filter with a brush or cloth etc., or replace it

•Re-install the filter and screw the filter lid back on

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