SAFETY VALVES AND PRESSURE RELIEF
What are safety valves and what are they for?
Safety valves or pressure relief valves are pressure regulating devices that are responsible for expelling excess pressure from the system when the maximum pressure levels for which they have been designed are exceeded, usually due to a
failure, thus avoiding the risk of malfunction and even explosion in extreme cases.
This type of valve is essential in all installations (boilers, pipe lines, storage tanks…) containing fluids at unacceptable pressures.
How do safety valves work?
Safety valves perform their function when the pressure of the system where the fluid is contained, becomes higher than the maximum set pressure of the valve previously adjusted. When the system pressure is higher than the valve’s set
pressure, this opens, releasing the excess pressure to the atmosphere or to containment tanks, depending on the toxicity of the fluid. After releasing the excess, the valve closes again and the system pressure returns to normal.
To ensure total safety of personnel and installation, make sure that the valves have passed all safety tests and meet the requirements of the system where they are to be installed. All our valves are supplied with certificates of materials, cas-
tings and test report according to EN-10204 3.1. and are designed according to ISO 4126-1
What is the difference between the instantaneous full opening safety valve AIT (PSV) and the normal opening relief valve AN or progressive opening relief valve AP (PRV)?
The main difference between these two types of valves lies in the opening speed when encountering a pressure increase in the circuit.
The Pressure Safety Valve (PSV) opens instantaneously and fully upon reaching the set pressure for which it is designed, expelling the excess pressure from the system immediately. They are optimised for use with steam or gases.
They may be equipped with a manually operated lever to open at lower pressures than the set pressure.
In contrast, the normally or progressively opening Pressure Relief Valve (PRV) opens gradually as the system pressure rises above the set pressure of the valve above its setting. They are optimised to work with liquids.
At VYC Industrial we are specialists in the design and manufacture of all types of safety valves. We have a wide range of safety valves to cover all the needs of the sector.
Contact us or ask for an estimate without obligation by filling in the form, writing to info@vycindustrial.com or calling +93 735 76 90.
SAFETY IN
Full lift safety valve with spring loading. (AIT)
Mod. 496 EN
Mod. 495 EN
> Mod. 496 EN
The Mod. 496 EN safety valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Operating principles AP CP EP ES
Assembly and disassembly instructions AP CP EP ES
Complementary technical instructions
Categorisation C Є
> Mod. 495 EN
The Mod. 495 EN pressure relief valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Operating principles AP CP EP ES
Assembly and disassembly instructions AP CP EP ES
Complementary technical instructions
Categorisation C Є
Mod. 596 EN
Mod. 696 EN
> Mod. 596 EN
The relief valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Complementary technical instructions
Categorisation C Є
> Mod. 696 EN
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Complementary technical instructions
Categorisation C Є
Mod. 695 EN
Mod. 895 EN CRYOGENIC
> Mod. 695 EN
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Fabrication Program
Catalogues by product
Operating principles AP AS EP ES
Assembly and disassembly instructions AP AS EP ES
Complementary technical instructions
Categorisation C Є
> Mod. 895 EN CRYOGENIC
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Fabrication program
Catalogues by product
Operating principles AP AS EP ES
Assembly and disassembly instructions AP AS EP ES
Complementary technical instructions
Categorisation C Є
Mod. 395 EN
Mod. 995 EN
> Mod. 395 EN
The Mod. 395 EN pressure relief valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Complementary technical instructions
Categorisation C Є
> Mod. 995 EN
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Operating principles AP AS EP ES
Assembly and disassembly instructions AP AS EP ES
Complementary technical instructions
Categorisation C Є
Mod. 694 CLAMP
> Mod. 694 CLAMP
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM. Connections according ASME ISO 2852 standard.
Catalogues by product
Operating principles AP AS EP ES
Assembly and disassembly instructions AP AS EP ES
Complementary technical instructions
Categorisation C Є
Normal safety valve. (AN)
Mod. 494 EN
Mod. 594 EN
> Mod. 494 EN
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open, at the fi rst proportional to the pressure increase, and after instantly and totally.
Design in accordance with “International Standard ISO 4126 -1 Safety Valves”.
Catalogues by product
Operating principles AP CP EP ES
Assembly and disassembly instructions AP CP EP ES
Complementary technical instructions
Categorisation C Є
> Mod.594 EN
The valve Mod. 594 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open, at the fi rst proportional to the pressure increase, and after instantly and totally.
Design in accordance with “International Standard ISO 4126 -1 Safety Valves”.
Catalogues by product
Complementary technical instructions
Categorisation C Є
Mod. 295 EN
Mod. 296 EN
> Mod. 295 EN
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open, at the fi rst proportional to the pressure increase, and after instantly and totally.
Design in accordance with “International Standard ISO 4126 -1 Safety Valves”.
Catalogues by product
Operating principles AP ES
Assembly and disassembly instructions AP ES
Complementary technical instructions
Categorisation C Є
> Mod. 296 EN
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open, at the fi rst proportional to the pressure increase, and after instantly and totally.
Design in accordance with “International Standard ISO 4126 -1 Safety Valves”.
Catalogues by product
Operating principles AP ES
Assembly and disassembly instructions AP ES
Complementary technical instructions
Categorisation C Є
Proportional safety valve with spring loading. (AP)
> Mod. 095 EN
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open proportional to the pressure increase.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Operating principles AP ES
Assembly and disassembly instructions AP ES
Complementary technical instructions
Categorisation C Є
> Mod. 096 EN
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open proportional to the pressure increase.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”
Catalogues by product
Operating principles AP ES
Assembly and disassembly AP ES
Complementary technical instructions
Categorisation C Є
> Mod. 194 EN
The safety valve Mod. 194 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open proportional to the pressure increase.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Complementary technical instructions
Categorisation C Є
> Mod. 195 EN
The safety valve Mod. 195 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open proportional to the pressure increase.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Complementary technical instructions
Categorisation C Є
> Mod. 196 EN
The safety valve Mod. 196, works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open proportional to the pressure increase.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.
Catalogues by product
Complementary technical instructions
Categorisation C Є
Vacuum breaker safety valve
Mod. 795 EN
> Mod. 795 EN
The valve acts as an automatic regulator of pressure drops and prevents the creation of a vacuum inside pressurised installations or vessels.
Fabrication programCatalogues by product
Operating principles
Assembly and disassembly instructions
Complementary technical instructions
Categorisation C Є
Full lift safety valve with spring loading. (AIT)
Mod. 486 ASME
Mod. 485 ASME
> Mod. 486 ASME
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME/ANSI B16.5 standard.
Center to face dimensions according API-526.
Catalogues by product ANSI (SI) ANSI (USCS)
Operating principles AP CP EP ES
Assembly and disassembly instructions AP CP EP ES
Complementary technical instructions
Categorisation C Є
> Mod. 485 ASME
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME B1.20.1 standard.
Catalogues by product NPT (SI) NPT (USCS)
Operating principles AP CP EP ES
Assembly and disassembly instructions AP CP EP ES
Complementary technical instructions
Categorisation C Є
Mod. 586 ASME
Mod. 686 ASME
> Mod. 586 Instant full opening safety valve. (AIT)
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME/ANSI B16.5 standard.
Center to face dimensions according API-526.
Catalogues by product ANSI (SI) ANSI (USCS)
Complementary technical instructions
Categorisation C Є
> Mod. 686 Instant full opening safety valve. (AIT)
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME/ANSI B16.5 standard.
Center to face dimensions according API-526.
Catalogues by product ANSI (SI) ANSI (USCS)
Complementary technical instructions
Categorisation C Є
Mod. 685 ASME
Mod. 885 ASME CRYOGENIC
Mod. 985 ASME
> Mod. 685 ASME
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and
ASTM. Connections according ASME B1.20.1 standard.
Catalogues by product NPT (SI) NPT(USCS)
Operating principles AP AS EP ES
Assembly and disassembly instructions AP AS EP ES
Complementary technical instructions
Categorisation C Є
> Mod. 885 ASME CRYOGENIC
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME B1.20.1 standard.
Catalogues by product NPT (SI) NPT (USCS)
Operating principles AP AS EP ES
Assembly and disassembly instructions AP AS EP ES
Complementary technical instructions
Categorisation C Є
> Mod. 985 ASME
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME B1.20.1 standard.
Catalogues by product NPT (SI) NPT (USCS)
Operating principles AP AS EP ES
Assembly and disassembly instructions AP AS EP ES
Complementary technical instructions
Categorisation C Є
Mod. 385 ASME
> Mod. 385 ASME
The valve works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME B1.20.1 standard.
Catalogues by product NPT (SI) NPT (USCS)
Complementary technical instructions
Categorisation C Є
Normal opening safety valve. (AN)
Mod. 484 ASME
Mod. 584 ASME
> Mod. 484 ASME
The safety valve Mod. 484 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open, at the first proportional to the pressure increase, and after instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME/ANSI B16.5 standard.
Center to face dimensions according API-526.
Catalogues by product ANSI (SI) ANSI (USCS)
Complementary technical instructions
Categorisation C Є
> Mod. 584 ASME
The safety valve Mod. 584 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open, at the first proportional to the pressure increase, and after instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME/ANSI B16.5 standard.
Center to face dimensions according API-526.
Catalogues by product ANSI (SI) ANSI (USCS)
Complementary technical instructions
Categorisation C Є
Mod. 285 ASME
Mod. 286 ASME
> Mod. 285 ASME
The safety valve Mod. 285 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open, at the first proportional to the pressure increase, and after instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME B1.20.1 standard.
Fabrication program
Catalogues by product NPT (SI) NPT (USCS)
Complementary technical instructions
Categorisation C Є
> Mod. 286 ASME
The safety valve Mod. 286 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open, at the first proportional to the pressure increase, and after instantly and totally.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME/ANSI B16.5 standard.
Center to face dimensions according API-526.
Catalogues by product ANSI (SI) ANSI (USCS)
Complementary technical instructions
Categorisation C Є
Progressive opening safety relief valve. (AP)
Mod. 184 ASME
Mod. 185 ASME
Mod. 186 ASME
> Mod. 184 ASME
The safety valve Mod. 184 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open proportional to the pressure increase.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME/ANSI B16.5 standard.
Center to face dimensions according API-526.
Catalogues by product ANSI (SI) ANSI (USCS)
Complementary technical instructions
Categorisation C Є
> Mod. 185 ASME
The safety valve Mod. 185 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open proportional to the pressure increase.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME B1.20.1 standard.
Catalogues by product NPT (SI) NPT (USCS)
Complementary technical instructions
Categorisation C Є
> Mod. 186 ASME
The safety valve Mod. 186 works as an automatic pressure releasing regulator activated by the static pressure existing at the entrance to the valve and is characterized by its ability to open proportional to the pressure increase.
Design in accordance with “ASME code section VIII Div.1”.
Materials according ASME code section II and ASTM.
Connections according ASME/ANSI B16.5 standard.
Center to face dimensions according API-526.
Catalogues by product ANSI (SI) ANSI (USCS)
Complementary technical instructions
Categorisation C Є
Vacuum breaker safety valve
Mod. 785 ASME
> Mod. 785 ASME
The valve acts as an automatic regulator of pressure drops and prevents the creation of a vacuum inside pressurised installations or vessels.
Fabrication programCatalogues by product NPT (SI) NPT (USCS)
Operating principles
Assembly and disassembly instructions
Complementary technical instructions
Categorisation C Є
SAFETY EN/ASME
Multi-stage diffusion silencers
Mod.005 EN ASME/ANSI ASME/FNPT ASME/MNPT ASME/SW ….others to be agreed
> Mod.005 EN ASME/ANSI ASME/FNPT ASME/MNPT ASME/SW….others to be agreed
During the expansion process for compressible substances such as gases, steam or air, one of the main problems is noise pollution.
The noise is caused by opening the valve and discharging the expanded fluid at the speed of sound.
Silencers are a great way to reduce this noise, caused by discharging the valve, bringing it down to allowable levels.
They are used in places such as power, chemical and petrochemical plants to discharge safety valves, control valves, etc. in pressure lines and equipment that convey compressible substances such as steam, air, carbon dioxide, helium, methane, nitrogen, oxygen and other gases.
They achieve noise reductions of more than 50 dB without any additional acoustic absorption materials.
Catalogues by product
Complementary technical instructions
Categorisation C Є
Test bench for safety valves
MOD. 000 TEST BENCH FOR SAFETY VALVES DN10 – 125 / ¼” – 5”
>MOD. 000 TEST BENCH FOR SAFETY VALVES DN10 – 125 / ¼” – 5”
Test bench for regular inspections and setting and resetting safety valves. Ideal for distributors, maintenance companies or with in-house maintenance. It allows safety valves to be adjusted, tested and/or checked to the test pressure (setting) Pe wile cold (simulating service conditions), matching the opening pressure Ps and the closing pressure Pc, in accordance with the standard regulations.
Design in accordance with the requirements of machine directive 2006/427/EC and the pressure equipment directive (2014/68/EU).
Fabrication ProgramCatalogues by product
Complementary technical instructions
Categorisation C Є
Controlled safety pressure relief System CSPRS
Mod. 004
> Mod. 004
Controlled safety pressure relief system CSPRS valves are mainly used where conventional direct-loaded spring action valves cannot guarantee the opening and closing margins that certain specifi c conditions of service demand.
The objective is to help the closure by means of pressure so that the valve remains completely watertight until reaching the set pressure and/or to activate the opening with pressure.
Once evacuated and in keeping with a previous adjustment, to assist with closing pressure, to once again achieve closure with the desired watertightness.
This allows us to:
- Stabilise the functioning in critical applications of one or several valves.
- Improve performance, position, repeatability and operational effi ciency.
- Improve the opening-closure hysteresis.
- Reduce product losses and minimise them in the case of working with several valves at staggered pressures, if conditions so permit.
- Increase the operating pressure of the system up to 99.9% of the set pressure.The control safety pressure relief system CSPRS device can be used with any safety valve available in the market and in particular, with models VYC Mod. 485, 486, 494, 495 and 496.
Complementary technical instructions
