Festo VZXA Handleiding

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Translation of the original instructions

© 2020 all rights reserved to Festo SE & Co. KG

1About this document

This document describes the use of the above-mentioned product. It contains

additional information for use of the product in safety-related systems (safety

handbook in accordance with IEC61508).

1.1Applicable Documents

All available documents for the product www.festo.com/sp.è

1.2Specified standards

Version

IEC61508:2010 Part 1,2,4…7IEC61511:2016

Tab. 1 Standards specified in the document

2Safety

2.1General safety instructions

–Only use the product in original status without unauthorised modifications.

–Only use the product if it is in perfect technical condition.

–Use the valve only in the flow direction indicated.

–Take into consideration the ambient conditions at the location of use.

Media

–Only use media in accordance with the specifications 16 Technical data.è

–Use only media that will not cause dangerous reactions if mixed.

–Do not operate the product with chemically unstable gases, abrasive mediaor

solid materials.

–If water is used: up to approx.1000 ppm of chloride content is permitted.

Avoid tensile stresses.

–If aggressive media are used: limit temperature of medium to 65°C.

Actuator

–Do not open the actuator (pressure in the actuator or loaded spring).

–Avoid mechanical stresses on the valve. Do not use the actuator as a lever.

Return to Festo

Hazardous substances can endanger the health and safety of personnel and

cause damage to the environment. To prevent hazards, the product should only

be returned upon explicit request by Festo.

–Consult your regional Festo contact.

–Complete the declaration of contamination and attach it to the outside of the

packaging.

–Comply with all legal requirements for the handling of hazardous substances

and the transport of dangerous goods.

2.2Intended use

The angle seat valve VZXA-...-K is intended to shut-off gaseous or liquid media in

piping systems.

–To control liquid media, use only the product variant VZXA-B-... Use (media

flow under valve seat).

2.3Training of qualified personnel

Work on the product should only be conducted by qualified personnel. The quali-

fied personnel must be familiar with installation of process automation systems.

3Information on functional safety

3.1Operating conditions

–General information on safe operation 2 Safety.è

–Periodic tests (performance test) 11 Maintenance.è

–Ambient conditions and additional technical specifications

è 16 Technical data.

3.2Achievable safety rating

The product is suitable for use as an element in a safety-related system in accord-

ance with IEC 61511.

–In low-demand mode up to SIL 2

–In high-demand mode up to SIL 2.

Taking into account the necessary minimum hardware fault tolerance of HFT = 1,

the product can also be used up to SIL 3 with a redundant execution of the entire

system.

NOTICE!

It is only possible to determine whether the product is suitable for specific applic-

ations by also assessing further components of the subsystem.

3.3Safety function

Single-acting valves

The safety function comprises acceptance of the initial position on request. The

request is implemented by removal of the operating pressure.

–Valves with NO control function: the valve opens completely and remains

open until operating pressure is applied.

–Valves with NC control function: the valve closes completely and remains

closed until operating pressure is applied.

Double-acting valves

The safety function comprises acceptance of the required position on request.

This requires an external power supply.

3.4Characteristic values

Safety standards (in accordance with IEC 61508)Value

Assessment path (Route of assessment)2

H

/1

S

Type of subsystem (Type of Sub System)Type A

Mode of operation (Mode of Operation)Low Demand and

High Demand

Test interval (Assumed Test Interval)T

i

1 a

Confidence level (Confidence Level)1- 95%á

Hardware fault tolerance (Hardware Fault Tolerance)HFT0

Failure rate for dangerous errors (Lambda Dangerous)ë

D

1.36 * 10

-7

/h

Failure rate for dangerous errors not detected (Lambda Dan-

gerous Undetected)

ë

DU

1.36 * 10

-7

/h

Mean time to dangerous failure (Mean Time To Dangerous Fail-

ure)

MTTF

D

7.37 * 10

6

h

Degree of detection of dangerous errors by the proof test

(Proof Test Coverage)

PTC95%

Low Demand Mode

Assumed demands per year (Assumed Demands per Year)n

op

1/a

Mean probability of dangerous failure on demand (Average

Probability of Failure on Demand)

PFD

avg

5.95 * 10

-4

High Demand Mode

Assumed demands per year (Assumed Demands per Year)n

op

1/h

(8760/a)

Mean frequency of a dangerous failure per hour (Probability of

dangerous Failure per Hour)

PFH1.36 * 10

-7

/h

Tab. 2 Safety standards (in accordance with IEC 61508)

4Further information

–Accessories www.festo.com/catalogue.è

–Spare parts www.festo.com/spareparts.è

5Service

Contact your regional Festo contact person if you have technical questions

èwww.festo.com.

8130883

VZXA-...-V13/V14-...-K-...-V4

Angle seat valve with piston actuator

8130883

2020-07c

[8130885]

Operating instructions

Festo SE & Co. KG

Ruiter Straße 82

73734 Esslingen

Germany

+49 711 347-0

www.festo.com

Product specificaties