VIRCO 4200، 4400 and 4500 Series safety relief valves present the simple safe solution for heavy duty applications، such as crude oil extraction، transportation and processing in

Safety Relief Valves

  • Safety Relief Valves
  • Series 4000: Spring Loaded Safety Relief Valves
  • Series 4200: Conventional Type
  • Series 4400: Balance Bellows Type
  • Series 4500: Conventional Type Acc. to ASME Section I

Series 4200 and 4400 spring loaded safety relief valves have been designed according to API 520 and ASME Section VIII. The range of size and rating for these series are according to API 526 from 1 D 2 up to 8 T 10 from Class 150# up to Class 2500#. Also، high pressure design for large orifices Q، R and T are available acc. to costumer's request. Series 4500 has been designed according to ASME SEC I for steam drum، superheater، economizer and other power plants applications.

VIRCO 4200، 4400 and 4500 Series safety relief valves present the simple safe solution for heavy duty applications، such as crude oil extraction، transportation and processing in

Refineries

Petrochemical Industries

Oil and Gas- Onshore and offshore

Vessels and piping systems

Blow-down systems

Storage Tanks

Power plants

The Safety Relief Valves Series 4200 - Conventional Type Design

The Safety Relief Valves Series 4400 - Balance Bellows Type Design

Different Options and accessories are available :

Open Bonnet

Packed Lever Cap

Plain Lever Cap

Heating Jacket

INCONEL X750 Spring

INCOONEL 625 Bellows Assembly

Series 4500: It is a high pressure safety relief valves which are designed acc. to ASME Section I for high pressure water-tube boilers، superheaters and steam drums.

Features :

  • Full compliance with ASME Sec I (3% Over Pressure and 4% blowdown
  • Stainless Steel and Supper Alloy Steel Trims
  • High Capacity
  • High performance safety valve for large boilers and superheaters
  • Removable Nozzle
  • Special Trim for high pressure and temperature superheated steam
  • Easy blowdown rings (2 Adjusting rings) adjustment
  • Stellited disc and nozzle

Technical data :

  • Inlet size from 1 1/2’’ to 6”
  • Outlet size from 3” to 10”
  • Set pressure up to 210 Bar g
  • Relieving Temperature up to 575

The Safety Relief Valves Series 1500

  • Series 5000: Pilot Operated Safety Relief Valves
  • Series 5100: Pop action Type
  • Series 5300: Pop Action
  • Series 5200: Modulating action Type
  • Series 5400: Modulating action Type

VIRCO Pilot Operated Safety Valves (POSVs) are designed acc. to ASME SEC VIII، API 520 and API 526 standards. The full range of sizes from 1" x 2" up to 8" x 10" with all orifices from D - T is available for pressure ratings up to pressure class 2500 x 600.

Beyond API 526، VIRCO also offers Extra Orifices (also known as Full Port or Full Bore nozzles). The Extra Orifices provide maximum capacity in relation to valve size. In addition، VIRCO POSVs come in two different functional designs، i.e. Pop Action (Series 5100 & 5300) and Modulate Action (Series 5200 and 5400). These designs determine the POSVs operating characteristics.

  • Series 5100 : Pop Action Type

VCIRCO POSVs Series 5100 with quick opening

  • are used for applications where the certified discharge capacity needs to be reached quickly
  • are used for gas applications only
  • have an adjustable blowdown of 3 - 7% of set pressure
  • pressure conforming to ASME VIII which can be adjusted beyond API standard up to 15%
  • Series 5200 & 5400: Modulating Action Type
  • are used to minimize medium loss
  • are used if medium must not discharge to atmosphere
  • open in proportion to the overpressure to ensure that only as much mass flow is discharged from the safety valve as is necessary to prevent further pressure increase
  • are used for both liquid and gas applications

Series 5100 - Pop Action POSV

Series 5300-Pop Action POSV

Series 5200 - Modulating Action POSV

Series 5400 - Modulating Action POSV

Different options and accessories are available for this series acc. to customer's request.

  • Backflow preventer
  • Manual blowdown
  • Field test connection
  • Exhaust pilot vent to the body outlet
  • Pilot supply filter
  • Compliant with NACE MR-0175 and MR-0103 for sour applications
  • High pressure design for orifices Q، R and T
  • Valves design with orifice larger than T
  • Outlet flange rating Class 300
  • Test gag for hydrostatic test
  • Series 6000
  • Series 6200
  • Series 6300
  • Series 6400
  • Series 6700
  • Series 6900

Series 6200

This type of compact safety relief vales

  • Have been designed to meet all industrial applications up to E orifice
  • Open rapidly with an overpressure of max. 10 % (for gas/vapor services) and 10-25 % (for liquid services) to the full design lift.
  • Have an adjustable blowdown
  • Soft seated design for zero leakage
  • sizes from 1/2" x 1/2" up to 1" x 1"
  • both threaded and flange end are available

Safety Relief Valves Series 6200

Series 6300

This type of compact safety relief vales

  • Have been designed to meet all industrial applications up to E orifice
  • Open rapidly with an overpressure of max. 10 % (for gas/vapor services) and 10% (for liquid services) to the full design lift.
  • Have an adjustable blowdown
  • Hard seated design
  • sizes from 1/2" x 1/2" up to 1" x 1"
  • both threaded and flange end are available

Series 6300- Flanged End

Series 6300- Threaded End

Series 6400

This type of compact safety relief vales

  • Have been designed to meet all industrial applications up to E orifice
  • Are used only for gas service and open rapidly with an overpressure of max. 10 %
  • Have a fixed blowdown
  • Hard seated design
  • sizes from 1/2" x 1/2" up to 1" x 1"
  • both threaded and flange end are available

Series 6400- Threaded End

Series 6700

This type of compact safety relief vales

  • Have been designed to meet all industrial applications up to F orifice
  • open rapidly with an overpressure of max. 10 % (for gas/vapor) and 10% (for liquid services) to the full design lift.
  • Have an adjustable blowdown (3-10% for gas/vapor) 10-20% (for liquid) services.
  • Hard seated design
  • sizes from 1/2" x 1/2" up to 1 1/2" x 1 1/2"
  • both threaded and flange end are available

Series 6700- Threaded End

Series 6700- Flanged End

Series 6900

This type of compact safety relief vales is similar to series 6700 but this type has a balance bellows design for corrosive services and applications with high back pressure. Both threaded and flanged end are available.

Series 6900- Threaded End