Festo VZXA Manual

Festo Ikke kategoriseret VZXA

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Side 1/6

Translation of the original instructions

1 About 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).

1.1 Applicable Documents

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

1.2 Specified standards

Version

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

Tab. 1 Standards specified in the document

2 Safety

2.1 General 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.

2.2 Intended 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).

2.3 Training 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.

3 Information on functional safety

3.1 Operating 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.

3.2 Achievable 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.

3.3 Safety 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.

3.4 Characteristic values

Safety standards (in accordance with IEC 61508) Value

Assessment path (Route of assessment) 2

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

1 a

Confidence level (Confidence Level) 1- 95%á

Hardware fault tolerance (Hardware Fault Tolerance) HFT 0

Failure rate for dangerous errors (Lambda Dangerous) ë

1.36 * 10

-7

Failure rate for dangerous errors not detected (Lambda Dan-

gerous Undetected)

1.36 * 10

-7

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

ure)

MTTF

7.37 * 10

Degree of detection of dangerous errors by the proof test

(Proof Test Coverage)

PTC 95%

Low Demand Mode

Assumed demands per year (Assumed Demands per Year) n

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

1/h

(8760/a)

Mean frequency of a dangerous failure per hour (Probability of

dangerous Failure per Hour)

PFH 1.36 * 10

-7

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

4 Further information

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

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

5 Service

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

6 Product overview

6.1 Configuration

6.1.1 Product design

Position indicator

Pneumatic port (2)

Actuator housing

Pipe connection; feed or forward-

ing (depending on flow direction)

Leakage hole

Arrow for flow direction

Angle seat fitting

Actuator/valve interface with

spanner flat

Pneumatic port (4)

Fig. 1 Product design

Position indicator

The pneumatic position indicator shows the position of the actuator stem.

Indicator cylinder above Indicator cylinder below

Actuator stem retracted, valve opened Actuator stem extended, valve closed

Tab. 3 Position indicator

6.1.2 Product variants and type code

The following section explains selected product characteristics that are necessary

to understand the instruction manual. Description of the complete type code

èwww.festo.com/catalogue.

Characteristic Value Description

Type VZXA Angle seat valve

A above valve seat, closing in the direction of media flow

(for gaseous media)

Media flow

B under valve seat, closing against the direction of media

flow (for gaseous and liquid media)

Connection type TS6, TS7,

TS13

Line connection and connection standard

è 16.1 Technical data, general

M2 10…+180°CTemperature of medium z

M3 30…+200°Cz

V13 Stainless steel 1.4409Valve housing material

V14 Stainless steel ASTM A351-CF3M

TP PTFE modifiedSeat seal material

T PTFE

Medium pressure 4 to 30 –0.9…4bar to –0.9…30bar

(product versions suitable for use with vacuum

è Tab. 14 Medium pressure and operating pressure

VZXA-B-...-K-46,

è Tab. 15 Medium pressure and operating pressure

VZXA-B-...-K-75)

Actuator K Piston actuator

Actuator size 46, 75 46mm, 75mm

closed via spring force, NC

D double-acting

S opened via spring force, NO

Control function

PR closed by reduced spring force, NC

Material of actuator hous-

ing

V4 Stainless steel

Tab. 4 Description of key features

6.2 Function

The angle seat valve VZXA-...-K is an externally controlled 2/2-directional control

valve with piston drive. The valve seat is slanted approx. 40° toward the media

flow. To close the valve, the valve actuator using the piston rod presses the valve

disc into the valve seat in a force fit.

The supply of the operating medium is controlled by an external valve (usually

electrically actuated) that must also be integrated into the supply cable for the

drive.

The actuator can be rotated 360° around the valve body.

Flow over valve seat

– The valve is closed by spring force with the medium flow.

– Media pressure assists the closing of the valve.

– The valve is opened by operating pressure.

– Only suitable for gaseous media, because use of incompressible media

causes pressure surges in the piping.

Flow under valve seat

The valve is closed by spring force or by operating pressure against the media

flow.

– Media pressure assists the opening of the valve.

– In some designs media pressure that is too high or operating pressure that is

too low can result in the valve not closing completely.

Control function

Single-acting Double-acting

Closed by spring force or by

reduced spring force (normally

closed - NC)

Opened by spring force (nor-

mally open- NO)

Opening and closing by two-

way pressurising with operating

medium (compressed air)

Tab. 5 Control function

7 Transport and storage

• For delivery of used products: Comply with all legal requirements for the

handling of hazardous substances and the transport of dangerous goods. For

returns to Festo 2 Safety.è

• Store the product in a cool, dry, UV-protected and corrosion-protected envir-

onment. Ensure that storage times are kept to a minimum.

8 Mounting and installation

Use fittings G max. SW14 exclusively with angle seat valves VZXA-…-K-46-….x

Requirements

– The piping is unpressurised and there is no medium flowing through it.

– The line ends are mounted.

– Connecting cables and fittings are clean.

Cleaning the valve

• Remove all transport packaging. The material used in the packaging has been

specifically chosen for its recyclability (exception: oil-impregnated paper =

residual waste).

Traces of residual grease may be evident on the product due to the production

process used.

• Clean the valve immediately before installation.

Installing the valve

WARNING!

Risk of injury due to slipping or falling objects.

The valve can weigh up to 5.75 kg, depending on the product version. Body parts

can be crushed. This could cause serious head injury in overhead installations.

• Secure the valve from falling or slipping with suitable equipment.

1. Bring the valve into its mounting position.

– Observe the flow direction. The permissible flow direction is marked on

the angle seat fitting by an arrow Fig.1, .è6

2. Connect the piping to the angle seat fitting.

– Tightening torque Tab. 6 Pipe connection tightening torqueè

3. Connect the operating medium line.

– Pneumatic connection (2): operating medium

– Pneumatic port (4): exhaust port for single-acting drives or operating

medium for double-acting actuators

4. For single-acting drives: mount the silencer in the exhaust port or use a

tubing connection for guided exhaust air.

Connection size ["]

½ ¾

1 1 1 2¼ ½

Max. pipe connection tight-

ening torque

[Nm] 105 200 350 450 540 620

Tab. 6 Pipe connection tightening torque

Produkt Specifikationer

Mærke:	Festo
Kategori:	Ikke kategoriseret
Model:	VZXA

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