PERSTA DSK 10 Bedienungsanleitung

High Pressure Gate Valves

DSK and DSP

Operating instructions

Read the instructions prior to performing any task!

Dok.-Nr. 6401.DE.STD.06.2017, 4, en_GB

Translation of the original operating instructions

Stahl-Armaturen PERSTA GmbH

Mülheimer Str. 18

59581 Warstein-Belecke, Germany

Telephone: +49 2902 762-02

Fax: +49 2902 767-03

Email: [email protected]

Internet: www.persta.com

20.05.2021High Pressure Gate Valves DSK and DSP2

This manual enables safe and efficient handling of the high pres-

sure gate valve. The manual is a component of the product and

must be kept in the vicinity of the high pressure gate valve where it

is available to personnel at all times.

In addition, the local occupational safety regulations and general

safety regulations must be complied with for the high pressure

valve’s area of use.

The personnel must have carefully read and understood these

instructions before starting any work. The basic prerequisite for

safe work is compliance with all the specified safety and handling

instructions.

The diagrams in these instructions are provided as examples only

and may deviate from the actual version.

Although the size and pressure ratings of the valve

types vary, the information in these instructions

applies generally to all valves, provided nothing to

the contrary is specified.

This manual applies to the following versions of the series 700 JT

and 700 CT of the high pressure gate valves DSK and DSP:

Designation Series Nominal

diameter (DN)

[mm]

Pressure rate Class*

DSK 10 700 JT 50–150 PD 10 -

DSK 10 700 JT 200–350/300 PD 10 -

DSK 10 700 JT 350–700 PD 10 £725

DSK 26 700 JT 65–300 PD 25 / PD 40 £2500

DSK 10–63 700 JT / 700 JN 50–600 PD 10–63 £4500

DSP 10–63 700 CT / 700 CN 80–600 PD 10–63 £4500

* Assignment number in the pipe construction

nIgnition hazard assessment GA004

nConnection diagram provided

nRisk analysis according to Pressure Equipment Directive

nRisk analysis according to Machinery Directive

nActuator instructions

nTechnical data sheet

nBolt tightening torques according to the website:

www.persta.com

nand other documents included in the delivery

Information about the operating

instructions

Scope of the document

Other applicable documents

Supplemental directives

20.05.2021 High Pressure Gate Valves DSK and DSP 3

Mülheimer Str. 18

59581 Warstein, Germany

Phone: +49 2902 762-02

Fax: +49 2902 767-03

e-mail: [email protected]

Revision number Change/Supplemented informa-

tion

Date

1 Updates to chapter

“

Intended

use”.

05/05/2021

Customer Service - Stahl-Arma-

turen PERSTA GmbH

Revision overview

Supplemental directives

20.05.2021High Pressure Gate Valves DSK and DSP4

Table of contents

1 Overview.............................................................................. 7

2 Safety................................................................................... 9

2.1 Symbols in this manual................................................. 9

2.2 Intended use............................................................... 11

2.3 Safety signs................................................................ 12

2.4 Safety devices............................................................ 14

2.5 Residual risks............................................................. 17

2.5.1 Basic dangers at the workplace............................... 17

2.5.2 Electric shock hazard............................................... 18

2.5.3 Danger due to hydraulics......................................... 18

2.5.4 Hazards associated with the pneumatic system...... 19

2.5.5 Mechanical hazards................................................. 19

2.5.6 Thermal dangers...................................................... 20

2.5.7 Dangers due to hazardous substances and oper-

ating materials......................................................... 20

2.6 Behaviour in the event of an emergency.................... 22

2.7 Personnel requirements.............................................. 22

2.8 Responsibility of the operating company.................... 24

2.9 Personal protective equipment................................... 25

2.10 Spare parts............................................................... 27

2.11 Environmental protection.......................................... 28

3 Functional description..................................................... 29

3.1 Mode of operation of the high pressure gate valve..... 29

3.2 Seal to the outside...................................................... 30

3.3 Versions of the high pressure gate valve ................... 31

3.3.1 Shut-off element....................................................... 31

3.3.2 Actuator variants...................................................... 33

3.3.3 Display elements..................................................... 36

3.3.4 Connections............................................................. 36

4 Transport and storage...................................................... 39

4.1 Safety instructions for transport and storage.............. 39

4.2 Transport of packages................................................ 40

4.3 Storage of the valve.................................................... 41

4.4 Storage of spare parts................................................ 41

5 Installation......................................................................... 43

5.1 Safety instructions for installation............................... 43

5.2 Before the installation................................................. 45

5.3 Installing the valve...................................................... 46

5.4 Attaching additional safety devices............................. 46

5.5 For electric actuators, connect the power supply....... 47

5.6 For a hydraulic actuator, connecting the hydraulic

system........................................................................ 47

Table of contents

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5.7 For a pneumatic actuator, connecting the pneumatic

system........................................................................ 48

5.8 After the installation.................................................... 48

5.8.1 Pickling the valve..................................................... 49

5.8.2 Painting the valve.................................................... 49

5.8.3 Executing a system pressure test and leak test...... 50

5.8.4 Applying thermal insulation...................................... 50

6 Initial start-up.................................................................... 53

6.1 Safety instructions for commissioning........................ 53

6.2 Prior to commissioning............................................... 56

6.3 Executing the commissioning process........................ 57

7 Operation........................................................................... 59

7.1 Safety instructions for operation................................. 59

7.2 Operating the valve..................................................... 61

7.2.1 Valve with manual actuator (handwheel)................. 61

7.2.2 Valve with electric actuator...................................... 61

7.2.3 Valve with hydraulic or pneumatic actuator ............ 62

7.3 Operating the valve in an emergency......................... 63

7.3.1 Valve with manual actuator (handwheel)................. 63

7.3.2 Valve with electric actuator...................................... 64

7.3.3 Valve with hydraulic or pneumatic actuator............. 65

8 Maintenance...................................................................... 67

8.1 Safety instructions for maintenance............................ 67

8.2 Maintenance schedule................................................ 71

8.3 Maintenance tasks...................................................... 72

8.3.1 Visually checking the valve...................................... 72

8.3.2 Replacing the gland packing.................................... 72

8.3.3 Replacing the gasket of the pressure sealing

bonnet...................................................................... 77

8.3.4 Lubricating moving parts (stem thread)................... 81

8.4 After maintenance....................................................... 82

9 Faults and troubleshooting.............................................. 83

9.1 Safety notices for fault correction............................... 83

9.2 Fault table................................................................... 86

10 Dismantling, disposal....................................................... 89

10.1 Safety notice for dismantling and disposal............... 89

10.2 Dismantling............................................................... 92

10.3 Disposal.................................................................... 93

11 Index................................................................................... 95

Table of contents

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1 Overview

Fig. 1: High pressure gate valve (shown here: DSK 10 series)

1 Actuator (in the example: handwheel)

2 Stem

3 Bonnet

4 Pressure sealing bonnet

5 Nozzle for over pressure safety device (optional)

6 Body

7 Shut-off element (in the example: flexible discs)

8 Flow passage

The valves called high pressure gate valves are installed in pipes.

The body (Fig. 1/6) of the valve is flanged or welded in the pipe-

work, depending on the version.

The shut-off element is moved up and down via the stem (Fig. 1/2).

When the shut-off element (Fig. 1/7) is moved down into the flow

passage, no medium can flow through the valve. When the valve is

open, the medium flows through the entire body.

See

Chapter 3 “Functional description” on page 29.

Overview – high pressure gate

valves

Brief description

Overview

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The models DSK and DSP differ in the type of shut-off element:

nDSK: flexible disc gate valve

nDSP: parallel discs

See

Chapter 3.3.1 “Shut-off element” on page 31.

The stem is moved differently depending on the version:

nmanually via handwheel

nelectrically

nhydraulically

nPneumatically

See

Chapter 3.3.2 “Actuator variants” on page 33.

Depending on the version of the high pressure gate valve, it is suit-

able for use with water, steam, oil and other non-aggressive media.

The following tools are required for the tasks described in the oper-

ating instructions:

Forklift

Forklift with sufficient load-bearing capacity for transport of valves.

Hoist

Hoist with sufficient load-bearing capacity for transporting valves

and components.

Packing extractor

Tool for removing gland packing elements.

Pin puncher

Mandrel-like tool for punching out the segment rings.

Sling gear

Functional and approved gear for attaching valves and compo-

nents on the hoist.

Shut-off element

Actuator variants

Media

Tools

Overview

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2 Safety

2.1 Symbols in this manual

Safety instructions are indicated by symbols in this manual. The

safety instructions are introduced by signal words that indicate the

scope of the hazard.

DANGER!