The VS type is a pressure relief valve designed to reduce temporary pressure surge in burning appliances. The shutting-off of automatic valves or non-tightly closing of regulators can cause pressure increase; by releasing that overpressure in a relief line, VS valve enables the system to work properly again.
The VS type is a pressure relief valve designed to reduce temporary pressure surge in burning appliances. The shutting-off of automatic valves or non-tightly closing of regulators can cause pressure increase; by releasing that overpressure in a relief line, VS valve enables the system to work properly again.
In 1961 Elettromeccanica DELTA s.p.a. was founded in Arcade (TV) with the aim of designing and manufacturing oil burners with mechanical atomization. Today, Elettromeccanica DELTA and its brand Deltapumps and Elektrogas are leading manufacturers of gear oil pumps and safety control valves, exported in more than 60 countries in the world.
The VS type is a pressure relief valve designed to reduce temporary pressure surge in burning
appliances. The shutting-off of automatic valves or non-tightly closing of regulators can cause
pressure increase; by releasing that overpressure in a relief line, VS valve enables the system
to work properly again.
Valve housing is made of aluminum alloy die-cast.
Equipped with adjustable spring, so that relief pressure can be precisely set up on site.
Pipe connections meet group 2.
Designed for high relief flow.
Suitable for use with air and non-aggressive gases included in the 1, 2 and 3 families (EN 437).
Special versions for aggressive gases (like biogas or COG) are free of non-ferrous metals and
provided with rubber part made of FKM (J version).
Provided with pressure test points on two sides in the inlet chamber to connect manometers,
pressure switches or other gas equipments.
All components are designed to withstand any mechanical, chemical and thermal condition
occurring during typical service. Effective impregnation and surface treatments are used to
improve mechanical sturdiness, sealing and resistance to corrosion of components.
Valves are 100% tested and fully warranted.
In a relief valve inlet pressure acts on one side of a diaphragm, while on the other side there is a
spring. Diaphragm is connected to the disc: when force of inlet pressure is higher than spring
force, diaphragm moves and disc opens releasing gas in relief line. After discharging pressure
surge, inlet pressure gets lower and disc closes again. Relief pressure can be set operating on
the spring.
This device is usually installed in gas trains, industrial applications and gas firing systems.
Figure 2 shows an example of installation in combination with other Elektrogas devices.
Connections Threaded F/F ISO 7-1 Rp3/4 or Rp1
or ANSI-ASME B1.20 3/4”NPT or 1”NPT
Inlet pressure points: G 1/4” (ISO 228) or 1/4” NPT
Ambient
temperature -15°C … +60°C (+5 … +140°F)
Inlet – relief
pressure
Inlet pressure – max 3 bar (45 psig)
Spring colour Neutral Orange Blue Black
Relief pressure (mbar)
(psig)
45 – 150
0.65 – 2.15
85 – 190
1.25 – 2.75
150 – 450
2.2 – 6.5
400 – 1000
6.0 – 15
Discharge capacity see charts
Installation Horizontal (with settable spring upward) or vertical pipeline.
Gas type Air, natural gas, town gas, LPG (gaseous) of families 1,2,3 (EN437).
On request special version for biologically produced methane and COG.
Weight 1.3 Kg
Materials in Aluminum alloy
contact Brass
with gas Stainless steel
Plated steel
Polyamide
Anaerobic adhesive
Nitrile rubber (NBR)
Polytetrafluoroethylene (PTFE)
Specifications Free of brass
of J version Seals made of Fluoroelastomer (FPM), instead of NBR
for Biogas Max inlet pressure: 1 bar (black spring not available)
or COG Ambient temperature: -10 .. +60°C
It is recommended to check compatibility of gas contents and valve materials
before installation.
