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Home » Products » Breather Valves » Pressure & Vacuum Relief Valve

Pressure & Vacuum Relief Valve

Pressure & Vacuum Relief Valve
Pressure & Vacuum Relief Valve
Product Code : PFCI - BV - 2046
Product Specifications
  • Size
  • 40 to 300 mm
  • Type
  • Weight Loaded / Spring loaded
  • Pressure
  • Low Pressure
  • Port Size
  • 40 to 300 mm
Trade Information
  • Price
  • Minimum Order Quantity
  • 2 Pieces
  • Price Range
  • 20000 - 300000
  • Payment Terms
  • Telegraphic Transfer (T/T), Letter of Credit at Sight (Sight L/C), Cash Advance (CA), Cash in Advance (CID), Cheque
  • Supply Ability
  • 30 Per Month
  • Delivery Time
  • 3 Week
  • Packaging Details
  • Wooden Box
  • Main Export Market(s)
  • Asia, Australia, Central America, North America, South America, Eastern Europe, Western Europe, Middle East, Africa
  • Main Domestic Market
  • All India
  • Certifications
  • Vent capacity certified as per API 2000
Product Description

Precon Pressure & Vacuum Relief Valve

Application :-  Direct acting pressure/vacuum relief valves are low pressure devices specifically designed to protect tanks, process systems and equipment from excessive pressure and vacuum. As well as providing the primary layer of protection for tanks and process systems, pressure/vacuum valves also minimize emission losses of gases or vapors, thus protecting the environment and providing significant financial savings. Pressure and vacuum relief valves are also commonly known as breather valves or conservation vents

Principle of Operation :- PRECON pressure/vacuum relief valves have weight-loaded or spring-loaded pallets. Flow through the valve is controlled by the weight of the pallet or the spring force acting on the pallet to keep the device closed. Once the pressure or vacuum in the tank reaches the pallet closing force, the pallet will start to lift off the seat and allow flow through the valve.

Due to its air-cushioned sealing technology, PRECON valves prevent emission losses until very close to the set pressure, and prevents air intake until very close to the set vacuum. The geometry of the valves has been developed in order to optimize overall performance in terms of high flow capacity, set pressure, sealing and re-sealing. The modular nature of PRECON valves means they can be tailored to meet specific customers requirements: whether this is pressure or vacuum-protection only; or vapors and gases either piped-away or vented to atmosphere. A weather hood protects the pressure vent port and a mesh screen is fitted to prevent intrusion of foreign matter into the valve.

Features & Benefits of Vacuum Relief Valves :-

Pressure / vacuum relief valves provide high flow capacity from a compact valve size.

Wide range of pressure and vacuum settings to provide maximum tank protection while ensuring minimum gas loss.

Designed and manufactured to API 2000 / ISO 28300.

Seat leakage requirements of API 2000/ ISO 28300.

Low leakage minimize evaporation loss.

Economic savings due to reduced product loss.

Alternative connection types available on request.

Valve sizing service assists optimum valve performance / cost specification.

Product Specification :-

Designed and tested according to API2000.

Sizes available from 1.1/2. to 12 NB.

Standard materials include carbon steel and stainless steel. Others on request

Vented to atmosphere.

Modular construction.

The inlet flanges are in accordance with ASME B16.5 150LB RF. Others on request

PTFE/FEP diaphragms effectively prevent the seat and pallet from sticking.

Valves can be specially supplied with a flame arrester.

Attributes of  Pressure & Vacuum Relief Valve :-

DESCRIPTION

A

B

C

D

Body

Cast Aluminium

CS

A 351 CF8

A351 CF8M

Seat

SS304

SS304

SS304

SS316

Diaphragm

PTFE

PTFE

PTFE

PTFE

Stem

SS304

SS304

SS304

SS316

Weather hood

Aluminum

Aluminum

Aluminum

Aluminum

Screen

Stainless Steel

Stainless Steel

Stainless Steel

Stainless Steel

Fasteners

MS Zinc plated

MS Zinc plated

SS304

SS316

Any special materials like ECTFE coating, PTFE coating, FRP coating, Poly Propylene, Hast alloy upon request.

Size







40 mm 50 mm 65 mm 80 mm 100 mm 150 mm 200 mm 250 mm 300 mm

 Accuracy : + 5% up to 20 mbar Accuracy : + 3% above 20 mbar

Settings for Weight Loaded Design

Pressure : 2 mbar to 40 m bar

20 mm Wc to 400 mm Wc

Vacuum : 2 mbar to 40 mbar

20 mm Wc to 400 mm Wc

Settings for Spring Loaded Design

Pressure : > 40 mbar to 1000 m bar

>400 mm Wc to 10000 mm Wc

Vacuum : > 40 mbar to 900 mbar

>400 mm Wc to 9000 mm WC
 


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