Elektrogas VMH DN Series Manuale utente

delta-elektrogas.com

VMH

Safety shut off valves for gas

with hydraulic actuator

DN65 … DN300

- 0117

ELEKTROGAS – Technical Sheet EE175 - 0117

2-16

VMH

Contents

Description ………………………………………….. 3

Features …………………………………………….. 3

Functioning and application ………………………. 4

Special versions and optionals …………………… 5

Technical specifications …………………………… 5

Gas flow chart (pressure drop) …………………… 7

Standards and approvals …………………………. 9

Ordering information ………………………………. 10

Installation, adjustment and servicing ………….... 11

Elektrogas® is a brand name of

ELETTROMECCANICA DELTA S.p.A.

Via Trieste, 132 - 31030 Arcade (TV) - Italy

Tel +39 0422 874068

Fax +39 0422 874048

www.delta-elektrogas.com

info@delta-elektrogas.com

ELETTROMECCANICA DELTA S.p.A. reserves the right to update or make any technical changes without prior notice.

Connexion Developments Ltd, Unit 3 Rainbow Court, Armstrong Way, Yate, Bristol, BS37 5NG, England

www.solenoid-valve.world [email protected]

Tel: +44 (0) 1454 334 990 Fax: +44 (0) 1454 326 390

ELEKTROGAS – Technical Sheet EE175 - 0117

3-16

Description

The VMH type valve is a safety shut off valve for gas with hydraulic actuator. It is suitable for air

or gas blocking and releasing controls, required in the main pipe of gas power burners,

atmospheric gas boilers, industrial kilns and others gas consuming appliances.

See Tab. 2 for maximum operative pressure for every model.

Features

The valves are made of aluminum alloy with a range for connections from DN 65 up to DN 300.

Pipe connections meet group 2.

Suitable for use with air and non-aggressive gases included in the 1

, 2

and 3

families (EN

437).

Special versions for aggressive gases.

The valve is open only when energized: if, for any reason, power supply goes down, the valve

closes immediately (intrinsic safe).

Qualified for continuous service (100% ED).

Size DN65-80 is equipped with flow rate adjustment.

An incorporated fine mesh filter protects the valve seat and disc as well as downstream

components and prevents dirty contamination.

Provided with G1/4 pressure gauge on two sides in both inlet and outlet chamber to connect

manometers, pressure switches, leakage tester or other gas equipments.

The actuator is provided with ISO 4400 plug for easy cabling. The protection class is IP65 (EN

60529).

The actuator is provided with a led to visualize when it is energized.

All components are designed to withstand any mechanical, chemical and thermal condition

occurring during typical service. Effective impregnation and surface treatments have been used

to improve mechanical sturdiness, sealing and resistance to corrosion of the components.

Valves are 100% tested and fully warranted.

WARNING

This control must be installed in compliance with the rules in force.

ELEKTROGAS – Technical Sheet EE175 - 0117

4-16

Functioning and

application

The VMH type valve is a safety shutting

device using auxiliary power supply.

When it is de-energized, the spring pushes

on the seal disc, keeping the gas passage

closed. In this condition the inlet chamber is

filled with pressurized gas that forces on the

disc, improving the seal.

When the actuator is powered, the relief

valve closes, the pumps starts and the

pressurized oil pushes the piston. The disc

opens against the combined force of spring

and gas pressure.

When the disc reaches the end stop, the

pump is turned off and only the relief valve

is consuming power.

If the power supply is shut off, the relief

valve opens and the disc closes rapidly,

interrupting the gas flow.

Fig. 1 shows a sketch of a VMH valve.

This kind of valve is normally installed as safety and regulating device in gas trains, for industrial

applications and gas firing systems. Fig. 2 shows an example of installation, in combination with

other Elektrogas devices.

WARNING

Location and mode of installation must be in compliance with local rules in force.

Gas

network

Consumer

Ball

valve Valve

leak

tester

Gas Filter

Pressure

regulator

Pressure

switch

PSG

Pressure

gauge

Hydraulic

valve VMH

with PCS Hydraulic

valve

VMH

Fig. 1

Fig. 2

Solenoid valve

VMR-VML

ELEKTROGAS – Technical Sheet EE175 - 0117

5-16

Special versions

and optionals

A switch can be installed as a closed position indicator (see PCS datasheet ).

Whole range can be provided with Ex-proof execution for use in Zone 2, according to 94/9/EC

Directive (ATEX).

The whole range can be supplied in special version suitable for aggressive gases (i.e. biogas,

COG). This version is free of nonferrous metals and equipped with special seals.

Technical

specifications

Tab. 1

Connections Flanged PN16 – ISO 7005 from DN65 to DN300

Voltage rating (-15%/+10%) 230 VAC or 110 VAC 50/60 Hz

Power consumption 20VA (START 110 W)

Only for DN 250–300: 25VA (START 115W)

Ambient temperature -15°C / +60°C

Max. operating pressure see Tab. 2

Flow capacity see Tab. 2

Opening time see Tab. 2

Filter 600 µm, metal mesh

Protection class IP65 (EN 60529)

Cable gland Plug ISO 4400 with cable gland PG9

Materials in contact with gas Aluminium alloy

Brass

Stainless steel

Plated steel

Anaerobic adhesive

Nitrile rubber (NBR)

Fluoro elastomer (FPM)

Polytetrafluoroethylene (PTFE)

ELEKTROGAS – Technical Sheet EE175 - 0117

6-16

Tab. 2

model with CE 0063CO1798 certificate

opening time depends on ambient temperature, real voltage and inlet pressure

VMH valves are not suitable for very high number of cycles, as used in pulse firing.

Model Conn. Pmax

[bar]

Opening

time *

[sec]

Flow

Kvs

[m³/h]

Max cycles

per hour *

Overall dimensions [mm] Weight

[Kg]

A B C D Int h

VMH7 *DN 65 1,6 10..15 83,0 60 200 305 350 536 145 4x18 14

VMH8 *DN 80 1,6 10..15 92,0 60 200 305 350 536 160 8x18 14

VMH9 *DN 100 1,3 15..25 152,0 40 250 350 366 571 180 8x18 18

VMH93 *DN 125 0,5 25..40 250,0 30 310 460 461 671 210 8x18 34

VMH93U

DN 125 1,3 25..40 250,0 20 310 460 461 671 210 8x18 34

VMH95 *DN 150 0,5 25..40 315,0 30 310 460 461 671 240 8x23 36

VMH95

DN 150 1,3 25..40 315,0 20 310 460 461 671 240 8x23 36

VMH98 *DN 200 0,2 35..50 476,0 20 370 546 494 730 295 12x23 52

VMH98U

DN 200 1,3 35..50 476,0 15 370 546 494 730 295 12x23 52

VMH910U DN 250 1,3 40..60 660,0 15 405 600 560 852 355 12x28 59

VMH912U DN 300 0,6 45..75 970,0 15 460 700 596 923 410 12x28 106

Fig. 3

ELEKTROGAS – Technical Sheet EE175 - 0117

7-16

AIRGAS

VkV

⋅

Gas flow chart

(Pressure drop)

Fig. 4

Formula of conversion

from air to other gases

15°C, 1013 mbar, dry

Tab. 3

Gas type

Specific gravity

[Kg/m³]

GAS

251

Air

1,25 1,00

Natural gas

0,80 1,25

Town gas

0,57 1,48

LPG 2,08 0,77

ELEKTROGAS – Technical Sheet EE175 - 0117

8-16

When the flow read on the diagram is referred to operating pressure instead of standard

conditions, the pressure drop ∆p read on the diagram must be multiplied for the factor:

(1+ relative pressure in bar)

Example:

In the VMH8 - DN80 valve with an air flow of 200 Nm

/h there is a pressure drop ∆p = 6,0 mbar.

If we consider that 200 m

/h is the flow at 1500 mbar of inlet pressure, then the pressure drop to

be consider is:

∆p = 6,0x(1+1,5) = 15,0 mbar

Usually pressure drop and flow rate for the valves are read from the gas flow diagram.

However, the valves can also be chosen in accordance with the characteristic ”Kvs value” as

shown in table 2.

The selection of the valve requires the calculation of the Kv under the operating conditions.

Considering only subcritical pressure drops:

p<∆

Kv can be calculated with the formula:

(

)

273

514 pp

Kv ⋅∆+

where

V = flow rate [Nm

/h]

Kv = flow factor [m

/h]

ρ= density [Kg/m

]

= absolute inlet pressure [bar]

= absolute outlet pressure [bar]

∆p = differential pressure p

-p

[bar]

t = media temperature [°C]

To the Kv value calculated from operating conditions we add an allowance of 20%, to obtain the

minimum Kvs value which the valve should have:

Kvs > 1,2 Kv

Valve must be selected considering the following:

- Pressure drops ∆p ≤0,1p

are recommended and ∆p > p

/2 are always unadvisable

- Flow velocities w ≤15 m/s are recommended and w > 50 m/s are always unadvisable.

ELEKTROGAS – Technical Sheet EE175 - 0117

9-16

Standards and

approvals

The valves are designed and manufactured according to European Directive on Gas appliances

2009/142/EC and the certification has been issued by the notified body:

Kiwa Nederland B.V.

Wilmersdorf, 50

7300 AC Apeldoorn

Reg-n° CE 0063CO1798 (*)

The products with operating pressure superior 0.5 bar comply

with the Pressure Equipment

Directive 2014/68/UE (ex 97/23/CE) and the certification has been issued by the notified body:

CSI Spa

20030 Senago – MI –I

Reg-n° CE 0497 (PED/0497/2638/13)

The following standards/technical specifications have been fulfilled:

- Electromagnetic Compatibility (2014/30/UE)

- Low Voltage Directive (2014/35/UE)

- Rohs II (2011/65/UE)

- Atex (2014/34/UE) when shown upon the product.

Quality Management System is certified according to UNI EN ISO 9001 and the monitoring is

carried out by the notified body:

Kiwa Cermet Italia Spa

Reg.-n° 11989-A

(*) not applicable to all models, see Tab. 2

ELEKTROGAS – Technical Sheet EE175 - 0117

10-16

Ordering

Information

Tab. 4

Example:

VMH93.BK : valve DN125, 110V suitable for bio and coke gas

Optionals available: explosion-proof execution, PCS (closed position indicator switch), others

on request. They must be ordered with their code.

VMH 8 - -

Valve type VMH

Connections size and operative pressure

7 = DN65 1.6bar

8 = DN80 1.6bar

9 = DN100 1.3bar

93 = DN125 0.5bar

93U = DN125 1.3bar

95 = DN150 0.5bar

95U = DN150 1.3bar

98 = DN200 0.2bar

98U = DN200 1.3bar

910U = DN250 1.3bar

912U = DN300 0.6bar

Supply voltage

- = 230V 50/60Hz

B = 110V 50/60Hz

Special version

J = version for bio gas

K = version for coke gas

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