INSTRUCTIONS
TRUE BLUE™ PTFE DIAPHRAGM
RELIEF VALVES RVDT/RVDTM
ASSEMBLY, INSTALLATION & OPERATING INSTRUCTIONS
A. BEFORE INSTALLING
RVDT-614
1. Series RVDT/RVDTM valves will open when the inlet pressure
exceeds the set pressure when properly installed and used
within the recommended ranges of pressure, temperature, and
chemical compatibility. The ultimate determination of material
compatibility is previous successful use in the same
application. Call our Technical Support for information about
your application.
2. Minimum temperature 40ºF (5ºC)
B. INSTALLATION
1. The valve must be installed in the proper flow direction s indicated
by the flow label. All orientations, horizontal and vertical, are
suitable. Relief valves should be installed as close as possible to
the vessel or pipe which it is protecting.
2. Caution: Series RVDT/RVDTM is not a “pop safety” relief valve. it
is not intended for air or gas service. It does not regulate pressure
downstream of the valve. Caution: Plastic materials can degrade
in ultraviolet (UV) light or sunlight.
3. Visual Identification of Material
BODY MATERIAL COLOR
“PV” (Geon) (PVC) DARK GRAY
“CP” (Corzan) (CPVC) LIGHT GRAY
“PP” (Polypropylene) TRANSLUCENT WHITE
“PF” (Kynar) (PVDF) TRANSLUCENT WHITE/YELLOW
“TF” (Teflon) OPAQUE WHITE
Caution: Polypropylene and PVDF (Kynar) often look similar and may
be difficult to distinguish by color. Do not install in your system if you
are not sure.
4. Threaded Connections – A suitable thread sealant (ex. Teflon tape)
should be applied to make tapered threads to assure a “leak-tight”
seal. The assembly need only be made “hand-tight” followed by a
quarter (1/4) turn with a strap wrench. Do not over tighten or use pipe
wrenches on plastic pipe and components.
Caution: Teflon tape will “string” as pipe threads are joined. Loose
“strings” could lay across the seating surface and prevent the valve
from completely closing. To avoid this problem, clean out old tape,
and do not apply tape to the first thread. connections should be made
only to plastic fittings; metal pipe should only be installed with an
intervening plastic nipple. Metal pipe and straight threaded pipe tend
to cut, stretch, and distort the plastic bodies, which could result in
cracking or leaking over time.
5. Non-Threaded Connections – for solvent cementing o heat fusion,
contact your distributor.
C. OPERATION & SETTING
1. Relief Valve Operations – The function of a relief valve is to protect
a pressurized pipeline, vessel, or other similar system from excessive
pressure. When the inlet pressure exceeds the set point, the valve
opens to bleed off the excess pressure.
2. Back Pressure Operations – A back pressure valve maintains
pressure in a line or system. Excess pressure opens the valve,
keeping the inlet pressure at the set point.
Pressure & Temperatue Ratings for Water*
BODY MAT’L 77ºF (25ºC) 105ºF (40ºC) at MAX. TEMP.
PVD 150 PSI, 10 Bar 100 PSI; 7 Bar 40 PSI @ 140ºF, 3 Bar @ 60ºC
CPVC 150 PSI; 10 Bar 120 PSI; 8 Bar 40 PSI @ 140ºF; 3 Bar @ 60ºC
PP* 150 PSI; 10 Bar 125 PSI; 8 Bar 40 PSI @ 180ºF; 3 Bar @ 80ºC
PVDF 150 PSI; 10 Bar 120 PSI; 8 Bar 30 PSI @ 280ºF; 2 Bar @ 140ºC
PTFE 150 PSI; 10 Bar 140 PSI; 9 Bar 10 PSI @ 280ºF; 69 KPa @ 140ºC
* or compatible checmical - Ratings may be reduced for some applications.
Typical burst pressure is 4 times rating or more.
