VALVES
 

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)

Full lift safety valve with spring loading (AIT) - Mod. 496 EN

Mod. 496 EN

Full lift safety valve with spring loading (AIT) - Mod. 495 EN

Mod. 495 EN

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> 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”.

Fabrication Program
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”.

Fabrication Program
Catalogues by product
Operating principles AP CP EP ES
Assembly and disassembly instructions AP CP EP ES
Complementary technical instructions
 Categorisation C Є

Full lift relief valve with spring loading (AIT) - Mod. 596 EN

Mod. 596 EN

Full lift relief valve with spring loading (AIT) - Mod. 696 EN

Mod. 696 EN

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> 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”.

Fabrication program
 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”.

Fabrication Program
 Catalogues by product
Complementary technical instructions
 Categorisation C Є

Full lift relief valve with spring loading (AIT) - Mod. 695 EN

Mod. 695 EN

Full lift relief valve with spring loading (AIT) - Mod. 895 EN CRYOGENIC

Mod. 895 EN CRYOGENIC

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> 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

Full lift safety valve with spring loading. (AIT) - Mod. 995 EN

Mod. 995 EN

Full lift safety valve with spring loading. (AIT) - Mod. 695 CLAMP

Mod. 694 CLAMP

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> 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”.

 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. 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.

 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

Normal safety valve. (AN)

Mod. 494 EN

Mod. 594 EN

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> 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”.

 Fabrication program
 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”.

 Fabrication program
 Catalogues by product
 Complementary technical instructions
 Categorisation C Є

Mod. 295 EN

Mod. 296 EN

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> 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”.

 Fabrication program
 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”.

 Fabrication program
 Catalogues by product
Operating principles AP ES
Assembly and disassembly instructions AP ES
 Complementary technical instructions
 Categorisation C Є

Mod. 395 EN

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> Mod. 395 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 first proportional to the pressure increase, and after instantly and totally.
Design in accordance with “International Standard ISO 4126-1 Safety Valves”.

 Fabrication program
 Catalogues by product
 Complementary technical instructions
 Categorisation C Є

Proportional safety valve with spring loading. (AP)

válvulas de seguridad apertura progresiva

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> 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”.

 Fabrication program
 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”

 Fabrication program
 Catalogues by product
Operating principles AP ES
Assembly and disassembly AP ES
 Complementary technical instructions 
 Categorisation C Є

Válvulas de Seguridad de apertura completa

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> 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

 

Solicitar información

Vacuum breaker safety valve

Mod. 795 EN

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> 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 program
 Catalogues by product
 Operating principles
 Assembly and disassembly instructions
 Complementary technical instructions
 Categorisation C Є

SAFETY ASME

Full lift safety valve with spring loading. (AIT)

Válvulas de Seguridad - 486 485 685 ASME - VYC Industrial

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> 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.

Fabrication Program
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.

Fabrication program
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. 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.

 Fabrication Program
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

 

Full lift relief valve with spring loading (AIT) - Mod. 885 EN CRYOGENIC

Mod. 885 ASME CRYOGENIC

Full lift safety valve with spring loading. (AIT) - Mod. 985 ASME

Mod. 985 ASME

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> 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.

Fabrication program
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.

 Fabrication program
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

Normal opening safety valve. (AN)

Mod. 484 ASME

Mod. 584 ASME

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> 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.

Fabrication program
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.

 Fabrication program
Catalogues by product ANSI (SI) ANSI (USCS)
Complementary technical instructions
 Categorisation C Є

Mod. 285 ASME

Mod. 286 ASME

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> 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.

Fabrication program
Catalogues by product ANSI (SI) ANSI (USCS)
Complementary technical instructions
 Categorisation C Є

Mod. 385 ASME

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> Mod. 385 ASME

The safety valve Mod.385 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 “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

Progressive opening safety relief valve. (AP)

Mod. 184 ASME

válvulas de seguridad

Mod. 185 ASME

Válvula de seguridad de apertura total Asme

Mod. 186 ASME

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> 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.

Fabrication Program
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

MORE INFORMATION
+

 > 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 program
Catalogues 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

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> 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.

Fabrication program
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”

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>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 Program
Catalogues by product
Complementary technical instructions
 Categorisation C Є

Controlled safety pressure relief System CSPRS

Mod. 004

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> 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.
 Fabrication Program
 Complementary technical instructions

 

ISO 9001:2008 LOM EX EAC Quality Supervision Republic China&Certificat;

 
 

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