PERSTA DSK 10 User manual

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 2017
Stahl-Armaturen PERSTA GmbH
Mülheimer Str. 18
59581 Warstein-Belecke, Germany
Telephone: [phone]
Fax: [phone]
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
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Mülheimer Str. 18
59581 Warstein, Germany
Phone: [phone]
Fax: [phone]
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
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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 Ä 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
Ä 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 Ä 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!
This combination of symbol and signal word indi-
cates a hazardous situation that, if not avoided, will
result in death or serious injury.
WARNING!
This combination of symbol and signal word indi-
cates a potentially hazardous situation that, if not
avoided, may result in death or serious injury.
CAUTION!
This combination of symbol and signal word indi-
cates a potentially hazardous situation that, if not
avoided, may result in minor or moderate injury.
NOTICE!
This combination of symbol and signal word indi-
cates a potentially hazardous situation that, if not
avoided, may result in damage to property.
ENVIRONMENT!
This combination of symbol and signal word indi-
cates potential hazards for the environment.
Safety instructions may refer to specific, individual instructions.
Such safety instructions are integrated into the specific instruction,
so that the flow of reading is not interrupted during performance of
the task. The signal words described above are used.
Safety instructions
Safety instructions in specific
instructions
Safety
Symbols in this manual
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Example:
1. Loosen the bolt.
2.
CAUTION!
Risk of getting trapped by the cover!
Close the cover carefully.
3. Tighten the bolt.
The following symbols are used in the safety instructions to indi-
cate special hazards:
Warning signs Type of danger
Warning – high-voltage.
Warning – danger zone.
This symbol indicates useful tips and recommen-
dations as well as information on efficient and
trouble-free operation.
The following symbols are used throughout these instructions to
highlight specific instructions, results, lists, references and other
elements:
Symbol Explanation
Step-by-step instructions
ðResults of an action
References to sections of these operating
instructions and other applicable docu-
ments
Lists without a defined sequence
Special safety instructions
Tips and recommendations
Additional symbols
Safety
Symbols in this manual
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