Flowserve NAF ProCap Installation instructions

These instructions must be read prior to installing, operating, and
maintaining this equipment.
NAF ProCap Capping Valve
Installation
Operation
Maintenance
FCD NFENIM4155-00-A4 11/18
Original Instructions

NAF ProCap Capping Valve User Instruction –FCD NFENIM4155-00-A4
11/18
Copyright
All rights reserved. No part of these instructions may be reproduced, stored in a retrieval
system or transmitted in any form or by any means without prior permission of Flowserve
Corporation.
Disclaimer
Information in this User Instruction is believed to be complete and reliable. In spite
of all Flowserve’s efforts to provide comprehensive information and instructions,
sound engineering and safety practices should always be used. Please consult with
a qualified engineer.
Flowserve manufactures products to applicable International Quality
Management System Standards as certified and audited by external Quality
Assurance organizations. Genuine parts and accessories have been designed,
tested, and incorporated into the products to help ensure continued product
quality and performance in use. As Flowserve cannot test parts and accessories
sourced from other vendors the incorrect incorporation of such parts and
accessories may adversely affect the performance and safety features of the
product. The failure to properly select, install, or use authorized Flowserve parts and
accessories is considered to be misuse. Damage or failure caused by misuse is not
covered by Flowserve’s warranty. In addition, any modification of Flowserve
products or removal of original components may impair the safety of these
products in use.

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CONTENTS
1General Information.................................................................................................................................. 3
1.1 Scope of manual......................................................................................................................................... 3
1.2 Valve design................................................................................................................................................. 4
2Safety Information ..................................................................................................................................... 5
2.1 Intended use ................................................................................................................................................ 5
3Receiving inspection ................................................................................................................................ 6
4Lifting and handling................................................................................................................................... 6
5Installation .................................................................................................................................................. 9
5.1 Mounting of the ProCap on the digester ............................................................................................... 9
5.2 Option: Pressure Safety Switch Unit........................................................................................................ 10
5.2.1 Pressure Safety Switch Unit design and specifications....................................................................... 10
5.2.2 Mounting of the Pressure Safety Switch Unit to the valve ................................................................. 11
5.2.3 Connecting the pressure switches to the Pressure Safety Switch Unit ............................................ 11
5.2.4 Connecting the pressure switches to the Local Control Box ............................................................ 12
5.2.5 Flushing of the Pressure Safety Switch Unit ........................................................................................... 13
5.3 Option: Local Control Box........................................................................................................................ 14
5.3.1 Local Control Box design and specifications....................................................................................... 15
5.3.2 Function modes ......................................................................................................................................... 16
5.3.3 Electric wiring.............................................................................................................................................. 17
5.4 Option: Pneumatic cabinet .................................................................................................................... 23
5.4.1 Pneumatic Cabinet design and specifications................................................................................... 23
5.4.2 Installation of the Pneumatic Cabinet ................................................................................................. 24
5.5 Option: Water Mirror ................................................................................................................................. 25
5.6 Option: Flushing system ............................................................................................................................ 26
5.6.1 Flushing System design and specifications........................................................................................... 26
5.6.2 Extra flushinh sequence............................................................................................................................ 27
6Operation ................................................................................................................................................. 29
6.1 Operating sequence ................................................................................................................................ 29
7Bill of Material and recommended spare part kits ............................................................................. 31
8Ordering of spare parts........................................................................................................................... 34
9Maintenance............................................................................................................................................ 34
9.1 Disassembling the valve for replacement of the clamp ring seals and the seat seal ................ 35
9.2 Disassembling the valve for inspection and replacement of the ball sector, seat and stem
packing ................................................................................................................................................................. 36
9.3 Re-assembly of the NAF ProCap ............................................................................................................ 52
10 Returns and Disposal ............................................................................................................................... 71
10.1 Returns ......................................................................................................................................................... 71
10.1 Disposal and Recycling ............................................................................................................................ 71

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Annex A: Electric wiring of the Local Control Box. Drawing 33414591, part 1: ........................................ 72
Annex B: Electric wiring of the Local Control Box. Drawing 33414591, part 2: ....................................... 73
Annex C: Electric wiring of the Local Control Box. Drawing 33414591, part 3:........................................ 74
Annex D: Electric wiring of the Local Control Box. Drawing 33414591, part 4: ........................................ 75
Annex E: Electric wiring of the Local Control Box. Drawing 33414591, part 5:......................................... 76
Annex F: Logic sequence for Open & Close sequence of Local Control Box ........................................ 77
1General Information
1.1 Scope of manual
These instructions must be kept close to the product’s operating location or directly
with the product.
These instructions must be read prior to installing, operating, using, or maintaining
the equipment in any region worldwide. The equipment must not be put into service
until all of the safe operating conditions noted in the instructions have been met. Failure
to comply with the information provided in the User Instructions is considered to be
misuse. Personal injury, product damage, delay in operation, or product failure caused
by misuse are not covered by the Flowserve warranty.
This instruction provides necessary information for the correct handling of the NAF
ProCap Capping Valve. For additional equipment used together with the valve, please
refer to their corresponding instructions.
If you have any doubt about the correct use and handling of a specific version of NAF
ProCap Capping Valve, please contact your Flowserve representative.
The instructions and list of spare parts in this document are applicable to the NAF ProCap
Capping Valve in accordance with our Technical Bulletin NFENTB4155.
As the NAF ProCap Capping Valve is a special applications valve, special terms and
conditions may apply. Please refer to specific purchase.

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1.2 Valve design
The NAF ProCap Capping Valve is intended to be used in batch digesters. The valve is
mounted to the top flange of the digester and it automates the filling of wood chips
into the digester. During the cooking sequence, the valve is closed and gives a tight
seal to avoid gas/media leakage from the digester.
The valve shall be mounted to the digester top flange using the lower flange
connection of the valve. The chip chute can be connected to the ProCap valve using
the bolt pattern in the clamping ring on the top side of the valve.
The unique design of the ProCap is based on a ball sector which is lifted and lowered
from the seat by a lifting mechanism. This lifting mechanism is an eccentric hub which
is operated by a separate, smaller actuator.
The main parts of the complete automated ProCap, seen in Figure 1, are:
•NAF ProCap valve, including a safety locking device, the “jammer”.
•NAF Turnex (big) pneumatic actuator, for the opening/closing of the valve
•NAF Turnex (small) pneumatic actuator, for the lifting/lowering of the ball sector
•Limit switches
Figure 1: ProCap including actuators, jammer and
limit switches
There are also several optional devices available. We strongly recommend to use these
in order to facilitate the installation, maintain a high tightness and minimize
maintenance. These are the main optional devices:

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•Pressure Safety Switch Unit- includes pressure switches for interlocking of digester
pressure
•Local Control Box- simplifies the installation as it automates the sequences,
including flushing, and makes it possible to run the valve locally
•Pneumatic Cabinet- compact mounting of solenoid valves
•Water Mirror- prevents build-up on ball sector surface and traps potential gases
•Flushing system- effectively flushes the ball sector and helps the valve to
maintain a high tightness and to minimize maintenance
2Safety Information
2.1 Intended use
•The NAF ProCap Capping Valve is intended to be used for filling of wooden
chips into a batch digester. For any other use, please contact Flowserve
NAF.
•Assess all risks to eliminate the possibility of personal injury and material
damage. Read these instructions thoroughly.
•Always use the necessary protective equipment and comply with
applicable safety directives when working with the capping valve.
•The valve should only be installed, operated and maintained by
qualified personnel. Qualified personnel personnel are people who on
account of their education, experience, training and knowledge of
relevant standards, specifications, accident prevention and operating
conditions have been authorized by those responsible for the safety of the
plant to perform the necessary work, and recognize and avoid possible
dangers
•Do not open the valve during cooking! Make sure that the valve control
is set up so the valve can’t be opened during cooking.
•The valve can be hot! During cooking the valve body becomes hot.
Use necessary protective equipment to prevent getting burned.
•Be aware of moving parts! Never operate a valve without first ensuring
there is no risk of crush injuries when the ball sector is moving. Take
necessary safety precautions to avoid unintentional stroking of the
actuator/valve.
•Never dismantle a valve or part of a valve while there is pressure in the
valve!

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•When lifting the valve package, be aware of its weight and high centre
of gravity! Please read instructions under 2.2 “Lifting”
•If the valve has been delivered with the Pressure Safety Switch Unit
option, please make sure to follow the instructions in Section 5.2 in order to
make sure the Pressure Switches are connected to the digester pressure
and that the flushing valves are locked in the closed position during normal
operation!
•The product must not be operated beyond the parameters specified for
the capping valve. If there is any doubt as to the suitability of the capping
valve, contact Flowserve NAF for advice.
•Installing, operating, or maintaining the product/system in any way that is
not covered in this User Instruction could cause death, serious personal
injury, or damage to the equipment. This includes any modification to the
product/system or use of the parts not provided by Flowserve.
•Only operate the product/system when it has successful passed all
inspection acceptance criteria
•Do not operate the product/system in a partially assembled condition.
3Receiving Inspection
All ProCap valves leaving our facility are inspected and tested in accordance with the
relevant requirements. Valves equipped with actuators are subjected to functional
testing and are adjusted in such a manner that every unit is ready for direct installation
to the digester. However, NAF always recommend that a receiving inspection is to be
carried out.
We suggest the following inspection procedure:
•Check that the valve delivered is correct in terms of type, size, equipment,
etc.
•Examine the valve, actuator and valve accessories for possible damage
that may have occurred during transport.
4Lifting and handling
When lifting the valve package, be aware of its weight and high centre of gravity!
All lifting must be carried out on the valve itself and not on the actuators, limit switches
or other accessories. The valve has a high centre of gravity and may rotate if the valve
is only lifted in the valve body necks. We recommend that the valve is lifted using a
minimum of 3 pcs high strenght lifting eye bolts. In order to better balance the valve to
an upright position, please use one lifting point around the upper valve body neck (near

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the bigger sized actuator). See Figure 2. Table 1 shows approximate weight and lifting
eye bolt thread sizes.
Figure 2: Lifting of a NAF ProCap with mounted actuators.
DN
Size
Lifing Eye Bolts
Thread
Weight
(approx.)
Kg/Lbs
500/700
20/28
M20
850/1873
600/800
24/32
M20
1440/3174
750/950
30/38
M20
2700/5952
Table 1: Approximate weights and lifting eye bolt threads.
Note: During all handling of the valve, make sure that the digester connection flange
surface doesn’t get damaged. Never place the valve on a hard surface, e.g. on a
concrete floor. Instead place it on a soft and clean material, e.g. a new and clean
wooden board.
The ProCap is normally delivered as a complete and pre-tested valve assembly with
actuators, jammer, limit switches etc. We always recommend to keep the valve
assembly complete during the entire transportation and installation. However, if space
is limited, the big actuator can be removed during transportation without the need to
re-adjust the entire assembly after it has been re-installed to the valve. Follow the steps

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below for disassembly and reassembly of the big actuator. For part numbers, see
Figure 22 and Table 2.
1. Remove heat shield (65) by removing the 4 pcs screws indicated in Figure
3. Be careful when last set of fasteners are removed.
2. Use a marker/pencil and mark a line on both jammer plate (22) and
actuator (101). This line will help later getting the actuator back to the same
position.
3. Secure the actuator with lifting straps.
4. Remove the screws.
Do not remove the screws (33) as these are holding the jammer in
place, avoiding the ball segment to rotate due to its own weight.
5. Remove the big actuator by moving it horizontally, out from the valve.
Be aware of the weight of the actuator and always use appropriate
lifting straps!
6. Reverse all the steps above after the valve and actuator have been
transported to the digester top. Make sure to align the big actuator with
the valve using the line on actuator and jammer made in step 2.
Figure 3: Removing the heat shield

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5Installation
5.1 Mounting the ProCap valve on the digester
The NAF ProCap capping valve is intended to be used for cooking of wooden chips in
a batch digester. The valve shall be mounted to the digester top flange using the lower
flange connection of the valve.
During the lifting of the valve to its position on the digester top, please make sure
to follow the safety precausions in Section 4!
When installing the valve to the digester, make sure that the valve is installed in a position
enabling the actuators and other equipment to be removed without the need to
remove the valve from the digester.
The chip chute can be connected to the ProCap valve using the bolt pattern in the
clamping ring on the top side of the valve. If a water mirror should be used (see Section
5.5), the water mirror should be connected to the top of the valve and the chip chute
connected on top of the water mirror. We recommend to use an inspection hatch
located at least 400 mm/16” above the valve.
If the ProCap is operated directly from the DCS without the Local Control Box and the
Pneumatic Cabinet, the solenoid valves used are normally of the type 5/2 function for
all the pneumatic parts; big actuator, jammer and small actuator. We recommend:
oThe jammers (5/2 function, mono stable, fail safe position= jammers
locked)
oValve open/close action (5/2 function, bistable)
oBall sector up/down action (5/2 function, bistable)
Note: It’s important that the valve isn’t opened or closed with the ball sector in the upper
position. Therefore we recommend that a bistable 5/2 solenoid valve is used for the
actuation of the smaller actuator. This will prevent the sector from being in the wrong
position after a power failure.
Note: During the operation of the ProCap valve it is mandatory that the valve can’t be
opened before the pressure in the digester has dropped to zero or almost zero.
Therefore, the pressure in the digester must be used to interlock the opening of the
valve. Pressure switches may already exist, sitting in the digester itself, or can be
attached using the DN80 PN 25 connections on the valve body. The valve is delivered
with both these connections sealed with two blind flanges.

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At delivery, the ProCap is also:
•Prepared for stem seal surveillance: In the covers (Fig 18, item 50 and 51) there
are G ¼” ports that are plugged at delivery. In these ports, it is possible to
connect a pressure gauge, or pressure transmitter, for indication of pressure due
to a leakage over the stem seals. Alternatively, it can also be used for sealing
water.
•Prepared for segment flushing: Built into the clamp ring (Fig 18, item 8) there is a
G 1” pipe connection where water for flushing can be connected. Please see
Section 5.6 for more details. At delivery, the connection has been plugged.
5.2 Option: Pressure Safety Switch Unit
As an option, a Pressure Safety Switch Unit can be delivered with the valve. It is delivered
with two pressure switches which also can be integrated with the NAF ProCap Local
Control Box. By having a double pipe connection, pressure can be detected even if
one pipe is blocked. The Pressure Safety Switch Unit can be cleaned while in service as
it comes with a connection for flushing water.
5.2.1 Pressure Safety Switch Unit design and specifications
The Pressure Safety Switch Unit has a total of five ball valves integrated into a pipe loop
with a flange connection.
•Flange connection: DN 80
•Flange material: EN 1.4401/1.4436
•Ball valves:
oFeed pipes: 2 pcs NAF Triball DN 25, PN 40, PTFE seated in EN 1.4408
oPressure switch and water connections: NAF Triball DN 15, PN 40, PTFE
seated in EN 1.4408. Threaded female connection Rp ½”
•Pressure switches: 2 pcs, female NPT ½” in 316 stainless steel, DPDT circuitry

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Figure 4: Pressure Safety Switch Unit. Figure 5: Pressure Safety Switch Unit
mounted on the ProCap valve
5.2.2 Mounting of the Pressure Safety Switch Unit to the valve
In order to minimize the risk of damage during transportation, the Pressure Safety
Switch Unit is normally supplied separately and needs to be mounted to the valve
after the valve has been mounted to the digester. For part identification, please see
Figure 17.
1. Untighten the nuts (32) and remove the lid (27) on the right side of the valve,
seen from the big actuator when the valve is standing on the digester
connection flange (see Figure 5).
2. Mount the Pressure Safety Switch Unit onto the studs (31) using the existing
gasket (35).
3. Lubricate the contact surface of the nuts (32) with a suitable anti-galling
grease and put the nuts onto the studs (31).
4. Tighten the nuts (32) alternately in several stages, and finally tighten them
firmly
5.2.3 Connecting the pressure switches to the Pressure Safety Switch Unit
Note: The two pressure switches included in the delivery of the Pressure Safety Switch
Unit, are supplied separately and must be connected to the Pressure Safety Switch
Unit at the valves no. 3 and 4 using suitable tubing (not included in delivery). For
identification of the valves, see Figure 6.
See Section 5.2.3 for
safety locking of the
valves during operation.

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Figure 6. Valves in the Pressure Safety Switch Unit
Threading of valve/pressure switch is specified in Section 5.2.1. We recommend that
the pressure switches are mounted to a wall with an elevated position with a tubing
which is minimum 1 m/40” long. This will minimize temperature impact and any
potential condensate in the tubing can flow back to the digester.
All valves in the Pressure Safety Switch Unit must be locked at all times during normal
operation! Valve n:o 1-4 must be locked in the open position in order to make sure that
the digester pressure is connected to the pressure switches. Valve n:o 5 should be
locked in the closed position and should only be opened if there is a need for flushing
of the Pressure Safety Switch Unit, digester pressure is zero and a water flushing line has
been connected to the valve.
5.2.4 Connecting the pressure switches to the Local Control Box
When delivered from NAF, the default setting of the pressure switches is set to give
signal “1” when pressure <0.1 bar. The pressure switch type is of DPDT model and the
connection terminal in the switch is seen below. If using the NAF ProCap Local Control
Box, connect to switch 1 (see Figure 7). The signal/supply should go to 1C and the
signal back to the box should be 1 N.C. When the pressure <0.1 bar the pressure switch
activates and connects the two i.e. sends a signal back to the Local Control Box.

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Figure 7. Terminal in pressure switch
5.2.5 Flushing of the Pressure Safety Switch Unit
The Pressure Safety Switch Unit has a total of five ball valves integrated into a pipe
loop. If either one or both ends of the Pressure Safety Switch Units inlets become
plugged, follow the steps below. See Figure 6 for valve identification.
Make sure there is no pressure in the digester!
1. Unlock valve no. 1-5
2. Close valve No. 3 & 4 to protect the pressure switches from damage
3. Connect a flushing pipe to valve no. 5 if not already connected
4. Open valve no. 5
5. Close valve no. 1
6. Let flush for 1 –2 minutes
7. Open valve no. 1
8. Close valve no. 2
9. Let flush for 1 –2 minutes
10. Open valve no. 2
11. Close valve no. 5
12. Open valve no. 3 & 4
13. Lock all the valves.
All valves in the Pressure Safety Switch Unit must be locked at all times during normal
operation! Valve n:o 1-4 must be locked in the open position in order to make sure that
the digester pressure is connected to the pressure switches. Valve n:o 5 should be
locked in the closed position and should only be opened if there is a need for flushing
of the Pressure Safety Switch Unit, digester pressure is zero and a water flushing line has
been connected to the valve.

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5.3 Option: Local Control Box
The Local Control Box (see Figure 8) is a unit that greatly simplifies installation and
automates the operating sequence (see Section 6.1) of the ProCap valve. It also grants
the user the possibility to run a step-by-step open/close sequence of the valve and to
get feedback to an independent safety system.
When the ProCap valve is used with the Flushing System, the Local Control Box also
automates the flushing of the ball sector each time the ball sector is operated. It controls
a solenoid valve as well as making sure there is a water flow by interlooking the
sequence to a flow switch. For further details please, see Section 5.6.
Figure 8: Local Control Box

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5.3.1 Local Control Box design and specifications
•Control Box material: AISI 316
•Supply voltage: 100-240 VAC
•Signal: 24 VDC
•Electrical cable entries: 12 pcs M20x1,5
•Max. allowed ambient temperature: 70°C
•Enclosure protection: IP65
•Enclosure size: approx. 400x400x200 mm
Design
The Local Control Box door is equipped with 9 LED’s, a “Lamp test” button, a
maneuverable button and a key slot. See Figure 8. The Local Control Box is also
equipped with four mounting brackets for wall mounting.
The 8 pcs of LED’s to the left on the door are indicator lamps. These will indicate the
valve’s current position, the position of the ball sector, if the jammer is in the locked
position, if the digester pressure is <0.1 bar and if there is a water flow in the flushing
system. The LED to the upper right is to indicate whether the Local Control Box is set in
the function “Remote”. For increased safety, the Local Control Box is equipped with a
LED test. Simply by holding down the button “Lamp test”, all LED’s will glow to indicate
proper function.
The Local Control Box also contains two adjustable relays (see Figure 8):
-K5: adjustable time delay relay. This adds a delay of 0-10 seconds between the
rotation of the ball sector and vertical movement up and down of the ball
sector. This allows the bigger actuator to settle before the small actuator is
moving the ball sector up or down. This delay is set to function “on-delay” and is
normally set to 5 seconds at delivery and there should normally be no need to
change this. (If needed, see Section 5.6.2 for adjustment of a similar relay. Don’t
change dipswitch 4).
-K8: adjustable relay for an extra flushing sequence. When closing the valve with
flushing, this relay adds an additional, time controlled flushing sequence which
again opens the valve during the selected time. The relay is set to “interval”
function and the time normally set to 0.5 sec from factory but can be adjusted
up to 100 sec if there is a need to flush the sector even more. For further details,
please see Section 5.6.2.

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5.3.2 Function modes
The Local Control Box is equipped with three functions. To set it to a specific function,
turn the key in the upper right corner of the box to point to the desired function. The
functions available are:
•“Remote mode”: The Local Control Box is controlled by a DCS open/close signal.
The Local Control Box cannot be maneuvered by using the green control knob.
•“Off mode”: The Local Control Box is turned off. The NAF ProCap cannot be
operated neither from the DCS nor manually from the green control knob.
•“Local mode”: The green control knob is activated and it is possible to control
the NAF ProCap by turning the green control knob.
Using the Local Control Box in “Local mode”
The Local Control Box can be used to do step-by-step opening or closing sequence of
the NAF ProCap.
To operate the valve locally, set the box to function “Local mode”. By turning the
green control knob to either the right; to open the valve or to the left; to close the
valve. The green control knob will illuminate when turned and the valve will start to
operate. The knob need to be held in the desired position to proceed with the entire
sequence. By releasing the knob, the valve opening or closing will freeze in the current
position. This allows the user to inspect the valve in a desired position.
Note: For safety purposes, the local mode can only be used when there is no pressure
inside the digester.
Using the Local Control Box in “Remote mode”
During normal operation, the ProCap valve is in the “remote mode” and the Local
Control Box is controlled by an open/close signal from the DCS. When the Local
Control Box receives an open/close signal, it automates the operating sequence (see
Section 6.1) of the ProCap valve. From the Local Control Box the DCS can also receive
signals for indication of pressure, valve position etc. There is also a separate,
independent safety system as both the jammers and the limit switch for “valve closed”
is equipped with an extra switch. This independent safety system can be connected to
a separate safety loop in the customer DCS for additional safety. For further
information about detailed functionality and functional, please see section 5.3.3 and
Annex E.

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5.3.3 Electric wiring
This is a description for connecting the Local Control Box to customer DCS and how to
connect the Local Control Box with the NAF ProCap Capping Valve. The NAF ProCap
Local Control Box is wired according to drawing 33414591 (see Figure 10-14 below).
Please refer to this drawing for further details on wiring of the Local Control Box. Figure
9 shows the terminal layout.
Note: If Flushing System is not used: Move the jumpers at terminal section 5. Move jumper
connecting 1 and 2 to connect 2 and 3 instead. Move jumper between 4 and 5 to 5
and 6 instead. (see Figure 8).
Figure 9: Terminal layout

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Terminal block section X0: Power Supply (see Figure 10)
The Local Control Box uses a 100 –240 VAC power supply. This, together with ground
connection, is to be connected to section “X0” of the terminal block.
Terminal block section X1: DCS control (see Figure 10)
•Position 1: connect to the DCS, which will give signal when the Local Control Box
is set to “Remote mode” function. From position 1 & 2, there is the possibility to
connect indication lights for “Remote mode” and “Local mode”.
•Position 3: Signal from the DCS: OPEN VALVE
•Position 4: Signal from the DCS: CLOSE VALVE
Figure 10: Drawing 33414591, part 1, Terminal X0 and X1: Power supply and remote control
(DCS). For larger image, see Annex A.

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Terminal block section X1 and X2: DCS signals and Independent Safety System (see
Figure 11)
•X1, Position 5 –10: Local Control Box can be connected to DCS to send signal
indicating
oPosition 5 –6: Pressure switch signal: DIGESTER PRESSURE < 0.1 BAR
oPosition 7 –8: Limit switch signal: VALVE CLOSED
oPosition 9 –10: Limit switch signal: VALVE OPEN
•X1, Position 11 –14: The Local Control Box is equipped with an optional
independent safety system as both the jammers and the limit switch for “valve
closed” are equipped with an extra, separate switch. This independent safety
system can be connected to a separate safety loop in the customer DCS for
additional safety. This is to be supplied with 24 VDC separately. See Figure 11.
•X2, Position 29-37: Connections for extra, separate limit switches from jammers
and “valve closed”, for the optional separate independent safety system
Figure 11: Drawing 33414591, part 2, Terminal X1 and X2: Signals back to DCS plus Independent
Safety System including extra limit switches for jammers and closed valve. For larger image,
see Annex B.