Ashcroft PL02 User manual

Installation and Maintenance Instructions for
PL02 Pressure Limiting Valve (PLV)
©Ashcroft Inc. 2020, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. pl02_accessory_i&m_RevD_04-20-20
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TABLE OF CONTENTS:
1 DESCRIPTION...................................................................... 1
1.1 Intended use ................................................................. 1
1.2 Cutaway......................................................................... 1
1.3 Labeling......................................................................... 2
2 TRANSPORTATION AND STORAGE .................................. 2
3ASSEMBLY ........................................................................... 2
3.1 Installation requirements............................................. 2
3.2 Connecting the pressure limiting valve...................... 2
4 COMMISSIONING................................................................ 2
5OPERATION ......................................................................... 2
5.1 General Information ..................................................... 2
5.2 Operating conditions.................................................... 2
5.3 Operation ...................................................................... 2
6MAINTENANCE.................................................................... 2
6.1 General information ..................................................... 2
6.2 Maintenance and repair............................................... 2
7 APPLICABLE DOCUMENTS ............................................... 2
1 DESCRIPTION
1.1 Intended use
The adjustable PLV serves as protection against excess
pressures exceeding the measurement range of the
instruments used. The maximum permitted inlet pressure
is 14,500 psi. Oil/grease-free type gauge protectors for
oxygen operation have an operating pressure of 3,625 psi.
The maximum operating temperature is 176°F. (or 60°C for
the oil/grease free types). Use beyond these limits and any
unauthorized modifications are not permitted and relieve the
manufacturer from liability for any consequential damage that
may arise.
Material suitability:
It must be particularly ensured that the materials used for the
medium contacting parts of the gauge protector are suitable
for the media used. Ashcroft cannot be held responsible for
damage to the gauge protector caused by corrosive media.
Failure to comply with these precautions can endanger the user
and cause damage to the piping system.
1.2 Information about the pressure equipment
The allowable operating pressure depends on the temperature
of the medium and on the materials and sealing’s used.
1.3 Labelling
• Material
• Charge/molten mass
• Factory inspector
• Direction arrow
• Pressure rating class (nominal pressure)
• Article number
• Set range [in psi]
2 TRANSPORTATION AND STORAGE
The PLV must only be stored in its original packaging to avoid
contamination or damage. The PLV must only be transported in
depressurized state.
3 ASSEMBLY
3.1 Installation requirements
The following installation conditions apply to the PLV:
The PLV must be installed such that employees or third parties
are not endangered.
The PLV must be installed or mounted such that
• it is accessible for any necessary inspection and is clearly
visible.
• the labelling is clearly legible
• operation of the PLV is possible from a safe position
The PLV must be protected from outside mechanical influences
to prevent damage. The PLV must be protected from
tampering.
1 Adjusting Screw
2 Locking Screw

Installation and Maintenance Instructions for
PL02 Pressure Limiting Valve (PLV)
©Ashcroft Inc. 2020, 250 East Main Street, Stratford, CT 06614-5145, USA, Tel: [phone], Fax: [phone], www.ashcroft.com
All sales subject to standard terms and conditions of sale. pl02_accessory_i&m_RevD_04-20-20
of 22
3.2 Connecting the PLV
The PLV must be connected directly to the instrument as pro-
vided. Additional introduction of forces, bending strains applied
to the female connectors by piping connections must be avoid-
ed. Weld seams on connections must be welded and tested in
compliance with valid and approved welding methods. If the
weld ends are made of steel, they must be painted after weld-
ing in order to avoid corrosion.
4 START-UP
Before start-up, ensure the PLV:
• has been correctly installed in the system and
• has been inspected for the correct assembly, installation
conditions and is functioning safely.
The start-up test must be arranged by the system operator.
5 OPERATION
5.1 General information
Oil/grease free PLV’s for instruments are used with
various media. They can be poisonous, irritating or
very hot. Any assembly and maintenance work must
only be carried out by experienced and trained personnel.
The generally valid regulations on health and safety as well as
accident prevention must be observed in addition to this oper-
ating manual and the operating instructions for the system and
instruments that are used. The PLV must only be operated by
authorized personnel.
5.2 Operating conditions
Refer to section 1.1 for the allowable pressure and temperature
limits.
5.3 Operation
5.3.1 Function
When the set pressure is reached, the valve automatically
closes, thus blocking off the flow to the pressure instrument.
When the pressure falls approx. 25% under the closing
pressure, the valve opens and again releases the flow.
5.3.2 Setting range
The gauge protectors have the following set ranges:
STYLE A - 6 — 36 psi
STYLE B - 30 — 85 psi
STYLE C - 75 — 360 psi
STYLE D - 300 — 850 psi
STYLE E - 750 — 3,600 psi
STYLE F - 3,500 — 5,800 psi
5.3.3 Setting the closing pressure
PLV’s must be ordered with the required set point included
within the model code. If necessary, the PLV’s can be set in the
field by following the steps below:
• Turn the locking screw counter clockwise to free large
adjusting screw to allow for set point adjustments (refer to
image in section1.2)
• To increase limiting pressure set point, turn adjusting screw
clockwise.
• To decrease limiting pressure set point, turn adjusting screw
counter clockwise.
• Apply pressure to the system to set the point pressure required,
making sure not to exceed the pressure instrument specifications.
• If the pressure limiting valve has not closed, turn the adjusting
screw counter clockwise until the PLV closes.
• If the PLV closed before reaching the set point, turn the screw
clockwise until the PLV opens. Once the PLV is open, turn the
adjusting screw counter clockwise until the PLV closes.
• Repeat the steps above as required to verify set point and
repeatability.
• Turn the locking screw clockwise to lock adjusting screw to
prevent set point drift.
6 MAINTENANCE
6.1 General Information
The locking screw must not be removed in view of
the setting pressure! Do not dismantle the PLV.
6.2 Maintenance and repair
Check the PLV regularly for tightness and damage.
Worn or damaged PLV’s cannot be repaired by the
customer.
7 APPLICABLE DOCUMENTS
• Pressure Equipment Directive 2014/68/EU.