Pressure and VacuumReliefvalves(PVRV) & Breather Valves

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Pressure and VacuumReliefvalves(PVRV) & Breather Valves

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Pressure and VacuumReliefvalves(PVRV) & Breather Valves Specification

Valve Size
2 (50mm) to 12 (300mm), customized sizes available.

Material
Aluminum, Carbon Steel, Stainless Steel 304/316, Cast Iron, special alloys on request.

Features
Pressure/vacuum setting field adjustable, self-actuated, corrosion-resistant, low maintenance, flame arresting options available, weather hood optional.

Valve Type
Relief Valve, Breather Valve

Control System
Self-actuated, spring or weight loaded.

Connection Type
Flanged to ANSI/ASME/IS/DIN standards, Screwed, customized ends on request.

Sealing
Soft or metal seated sealing (PTFE, Viton, Metal to Metal, Nitrile, Neoprene optional)

Application
Tank venting, storage tank protection, process vessels, and pipeline systems requiring controlled pressure/vacuum relief.

Structure
Housed with body, cover, seating arrangement, disc, and breather mechanism.

Type
Pressure Vacuum Relief Valve (PVRV), Breather Valve

Power
Non-electric, spring or weight loaded.

Pressure
Set pressure/vacuum: 10 mmWc to 700 mmWc (Standard), custom settings available.

Media
Air, vapors, gases, or inert media

Port Size
2 to 12 (Standard), customized sizes available.

Temperature
-10C to 180C (Depending on Material)

Disc
Corrosion-resistant, guided or balanced disc.

Gasket
PTFE, EPDM, Nitrile, or as specified

Installation Position
Mounted vertically on tank nozzle

Design Standard
API 2000, BS, IS, or as required

Maintenance Access
Top/side opening for inspection and cleaning

Set Pressure Range
Factory calibrated per requirements

Optional Accessories
Flame Arrestor, Weather Hood, Limit Switch, Locking arrangement

End Connection
Flanged RF/FF or threaded

Finish
Epoxy coated or as ordered

Test Certification
Hydrostatic and seat leak test certificate provided

Leak Tightness
As per API 2000 or BS

About Pressure and VacuumReliefvalves(PVRV) & Breather Valves

Pressure and Vacuum Relief valves (PVRV) & Breather Valves

Direct acting pressure/vacuum relief valves and breather valves are designed with the focus on tank protection. We manufacture a wide array of systems that include pressure only, vacuum only and combined pressure and vacuum valves. We also allow for either flanged outlets or venting to the atmosphere. Our PVRV and breather valves are widely used in digestors and gas holders, storage tank vents, vapor inclination systems, chemical processing plants, marine loading systems, vapor recovery systems, sewage treatment vapor processing and pharmaceutical industries.

Salient Features

Cost effective & customized solutions
Designed as per API 2000 6th edition
Various installations world over
Wide range of pressure and vacuum settings to provide maximum tank protection
Available in dead weight and spring loaded mechanism
Size ranges from 25 NB to 300 NB. (Higher sizes available on request)

Robust Design and Versatile Materials

Engineered for durability, these valves are constructed from corrosion-resistant materials, including stainless steel, carbon steel, aluminum, and special alloys. They can be fitted with either soft or metal seating, providing flexibility to handle a broad spectrum of media such as air, vapors, inert gases, and more. This construction ensures optimal performance across varied industrial environments and temperature ranges from -10C to 180C.

Customizable Performance and Easy Maintenance

Each valve is calibrated at the factory to specific customer requirements for set pressure and vacuum. Standard port sizes from 2 to 12 are available, with further customization possible. For operational convenience, the valves feature top or side access for rapid inspection and cleaning, minimizing process downtime and ensuring consistent protection.

Compliance and Safety Assurance

PVRVs and Breather Valves comply with API 2000, BS, and IS standards. Each unit undergoes rigorous hydrostatic and seat leak testing, accompanied by certification. Optional accessories such as flame arrestors, weather hoods, and limit switches enhance safety, making these valves ideal for safe storage and protection of valuable process assets.

FAQs of Pressure and VacuumReliefvalves(PVRV) & Breather Valves:

Q: How should Pressure and Vacuum Relief Valves be installed for optimal performance?

A: These valves are designed to be mounted vertically on tank nozzles, ensuring proper function in relieving excess pressure or vacuum. For installation, ensure the connection type matches your systemflanged (RF/FF) or threadedand that the mounting site is accessible for future inspection and maintenance.

Q: What is the process for calibrating the set pressure and vacuum for these valves?

A: Each valve is factory calibrated to your specified set pressure and vacuum, with ranges available from 10 mmWc to 700 mmWc as standard. Custom settings outside this range can also be provided. Calibration follows API 2000 or relevant standards to ensure safety and compliance.

Q: When is routine maintenance required for these valves?

A: Routine inspection and cleaning are recommended based on operation frequency and media characteristics. The top or side opening features of the valve simplify access for maintenance tasks, supporting continued reliable operation and regulatory compliance.

Q: Where are PVRVs and Breather Valves typically used?

A: These valves are commonly installed in storage tanks, process vessels, and pipelines requiring controlled pressure or vacuum relief. They are especially critical in tank venting applications, providing essential safety for liquids and gases under gentle or fluctuating pressures.

Q: What benefits do PVRVs and Breather Valves offer over conventional venting solutions?

A: They provide precise, self-actuated control to prevent tank or vessel damage from pressure/vacuum fluctuations, minimize emissions loss, ensure product integrity, and comply with international safety standards. Optional flame arresting and corrosion-resistant features add further protection and longevity.

Q: Which optional accessories can be added to enhance valve performance?

A: Flame arrestors, weather hoods, limit switches, and locking arrangements are available upon request. These accessories can enhance operational safety and suitability for different environmental conditions.

Q: How is leak tightness ensured in these valves?

A: Leak tightness is validated through hydrostatic and seat leak testing as per API 2000 or BS standards. Certificates are provided with each valve to guarantee compliance and performance according to customer requirements.

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