Introduction
Before beginning installation or maintenance, please read this manual to ensure correct use of
the product. Keep the manual in a safe place for future reference.
The DR20 direct-acting pressure reducing valve for steam and air is capable of reducing from
primary pressures of between 0.2 and 1.6 MPaG (30 – 230 psig) to secondary pressures between
0.014 and 1.0 MPaG (2 – 150 psig).
The A-DR20 direct-acting pressure reducing valve for air is capable of reducing from primary
pressures of between 0.2 and 1.0 MPaG (30 – 150 psig) to secondary pressures between 0.014
and 0.9 MPaG (2 – 135 psig).
They are designed for a long service life, and are made of stainless steel for superior durability.
1 MPa = 10.197 kg/cm
2
, 1 bar = 0.1 MPa
For products with special specifications or with options not included in this manual, contact TLV
for instructions.
The contents of this manual are subject to change without notice.
Continued on next page
1. Safety Considerations
• Read this section carefully before use and be sure to follow the instructions.
• Installation, inspection, maintenance, repairs, disassembly, adjustment and valve
opening/closing should be carried out only by trained maintenance personnel.
• The precautions listed in this manual are designed to ensure safety and prevent equipment
damage and personal injury. For situations that may occur as a result of erroneous handling,
three different types of cautionary items are used to indicate the degree of urgency and the
scale of potential damage and danger: DANGER, WARNING and CAUTION.
• The three types of cautionary items above are very important for safety; be sure to observe all
of them, as they relate to installation, use, maintenance, and repair. Furthermore, TLV accepts
no responsibility for any accidents or damage occurring as a result of failure to observe these
precautions.
Indicates an urgent situation that poses a threat of death or serious injury.
Indicates a DANGER, WARNING or CAUTION item.
Indicates that there is a potential threat of death or serious injury.
CAUTION
WARNING
DANGER
CAUTION Indicates that there is a possibility of injury, or equipment/product damage.
Install properly and DO NOT use this product outside the recommended
operating pressure, temperature and other specification ranges.
Improper use may result in such hazards as damage to the product or
malfunctions, which may lead to serious accidents. Local regulations may
restrict the use of this product to below the conditions quoted.
Take measures to prevent people from coming into direct contact
with product outlets.
Failure to do so may result in burns or other injury from the discharge of
fluids.
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature.
Disassembling or removing the product when it is hot or under pressure
may lead to discharge of fluids, causing burns, other injuries or damage.
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