Editorial Technical Reference

Vent/Exhaust Valve

This page explains how Vent/Exhaust Valve is classified within Chemical Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A valve designed to release gases or vapors from a purge system to maintain pressure balance and prevent overpressure.

View Full Specifications Explore Manufacturing Sources
Vent/Exhaust Valve in a manufacturing environment
Representative product image. Confirm appearance and specifications with the manufacturer.

Product Specifications

Technical details and manufacturing context for Vent/Exhaust Valve

Definition
A vent/exhaust valve is a critical component within purge systems that controls the release of gases, vapors, or air to regulate internal pressure, ensure proper system operation, and prevent hazardous overpressure conditions. It typically opens to exhaust unwanted substances and closes to maintain system integrity. This valve is commonly used in chemical manufacturing processes where purge systems are employed to remove contaminants or to inert the system. The valve is available in nominal diameters from 15 to 100 mm (ISO 6708), with operating temperatures from -20 to 150 °C. The leakage rate is ≤0.01% (ISO 5208, Class VI seat leakage). The flow coefficient (Cv) ranges from 5 to 120 m³/h (ISO 6358), depending on size and trim. The body material is stainless steel (CF8M per ASTM A351), and the seat material is PTFE (ASTM D4894) for chemical compatibility. Connection type is flanged (ISO 7005), with ANSI or DIN flanges. Actuation is pneumatic with spring return fail-safe (ISO 5211). Supply voltage for solenoid pilot is 24 V DC ±10% (IEC 60038). Enclosure rating is IP65 (IEC 60529). Weight ranges from 5 to 50 kg, depending on size and actuator. These values are directory reference ranges; verify model-specific values and standards with the legal manufacturer or supplier before procurement.
Working Principle
The valve operates by responding to pressure differentials or control signals. When internal pressure exceeds a set threshold or when purging is required, the valve opens to allow gas/vapor release. It closes when pressure normalizes or when the purge cycle completes, maintaining a sealed environment. The pneumatic actuator, with spring return, ensures fail-safe operation: in case of loss of air supply, the valve returns to its safe position (open or closed as per design). The PTFE seat provides tight shut-off, meeting Class VI leakage requirements. The valve is designed for use in purge systems where controlled venting is necessary to prevent overpressure and maintain process integrity.
Common Materials
Stainless Steel
Technical Parameters
ParameterTypical rangeNotes & selection driver
Nominal Diameter15–100 mmCommon sizes for purge systemsISO 6708
Operating Temperature-20–150 °CSeat material limits upper rangeISO 5211
Leakage Rate≤0.01 %Class VI seat leakageISO 5208
Flow Coefficient (Cv)5–120 m³/hDepends on size and trimISO 6358
Body MaterialCF8MStainless steel for corrosion resistanceASTM A351
Seat MaterialPTFEChemical compatibilityASTM D4894
Connection TypeFlangedANSI or DIN flangesISO 7005
Actuation TypePneumaticSpring return fail-safeISO 5211
Supply Voltage24 ±10% V DCFor solenoid pilotIEC 60038
Enclosure RatingIP65Dust-tight and water-jet protectedIEC 60529
Weight5–50 kgDepends on size and actuator

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Valve Body
    Main structural housing that contains internal components and connects to piping
    Material: Stainless Steel
  • Seat Part
    Sealing surface where the disc contacts to create a tight seal when closed
    Material: PTFE or Rubber
  • Disc/Plug Part
    Movable component that opens and closes to control flow
    Material: Stainless Steel
  • Spring Part
    Provides closing force and determines pressure set point
    Material: Spring Steel
  • Pneumatic Actuator
    Opens the valve on command and fails to the safe position on loss of air.

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 10 bar (g)
flow rate: Up to 500 m³/h
temperature: -20°C to 150°C
Media Compatibility
✓ Steam systems ✓ Compressed air networks ✓ Chemical process vapors
Unsuitable: Highly corrosive acidic environments (e.g., concentrated sulfuric acid streams)
Sizing Data Required
  • System design pressure (bar)
  • Required venting capacity (m³/h)
  • Process media temperature (°C)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Corrosion-induced leakage
Cause: Exposure to corrosive exhaust gases, moisture, or chemical contaminants leading to material degradation and loss of sealing integrity.
Mechanical binding/sticking
Cause: Accumulation of particulate deposits, thermal distortion, or lack of lubrication preventing proper valve movement and closure.
Maintenance Indicators
  • Visible exhaust gas leakage around valve body or flange connections during operation
  • Abnormal hissing or whistling sounds indicating improper sealing or flow restriction
Engineering Tips
  • Implement regular cleaning schedules to remove particulate buildup and prevent mechanical binding
  • Apply appropriate high-temperature anti-seize compounds on moving components and establish routine lubrication protocols

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 5211:2017 (Industrial valves - Part-turn actuator attachments) ANSI/ASME B16.34-2020 (Valves - Flanged, Threaded, and Welding End) DIN EN 593:2017 (Industrial valves - Metallic butterfly valves for general purposes)

Quoted from the published standard.

Manufacturing Precision
  • Bore diameter: +/-0.05mm
  • Seat flatness: 0.08mm maximum deviation
Quality Inspection
  • Helium leak test (pressure decay method)
  • Dimensional verification with CMM (Coordinate Measuring Machine)
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Vent/Exhaust Valve

2 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Fitok Group
Beijing, CN
Also makes: Directional Control Valve, Sample Handling System, Pressure Relief Valve and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Purge Valves”
View source page ↗ fitokgroup.com · recorded 2026-08-31
View profile Send enquiry
Hikelok
Chengdu, Sichuan, CN
Also makes: Pressure Regulator, Diaphragm Valve, Sample Intake System and 9 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Bleed and Purge Valves”
View source page ↗ hikelok.com · recorded 2026-08-27
View profile Send enquiry

Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.

Buyer enquiry

Request manufacturing insight for Vent/Exhaust Valve

Ask for use case, specification boundaries, supplier type, and RFQ preparation information for this product.

Where it goes
Straight to the CNFX editorial desk, and to the manufacturer if this product is linked to a claimed profile. Nothing is broadcast to a supplier list.
Your details stay here
We do not sell or rent enquiry data, and we do not add you to a mailing list. Used only to answer this request.
No commission, no middleman
CNFX is a directory. We take no cut of any order and never negotiate on a supplier's behalf.
What to include
Share your product specifications, quantity, destination and target delivery date.

Your business information is used only to process this request.

Thank you! Your message has been sent. We'll respond within 1–3 business days.
Sorry, we couldn't send your message. Please try again, or email us at [email protected].

Frequently Asked Questions

What is the primary function of a vent/exhaust valve in a purge system?

The primary function is to release gases, vapors, or air from the purge system to regulate internal pressure, prevent overpressure, and maintain system integrity. It opens when pressure exceeds a set threshold or during purging, and closes when pressure normalizes.

What are the typical operating pressure and temperature ranges for this valve?

The directory reference ranges are -20 to 150 °C for operating temperature. However, actual limits depend on the specific model and seat material; verify with the manufacturer.

What materials are used for the valve body and seat?

The body is made of stainless steel (CF8M per ASTM A351), and the seat is PTFE (ASTM D4894) for chemical compatibility. These materials are listed in the directory; confirm suitability for your specific chemicals with the supplier.

How is the valve actuated and what fail-safe features does it have?

The valve is pneumatically actuated with a spring return fail-safe mechanism (ISO 5211). In case of air supply loss, the valve returns to its safe position. The solenoid pilot operates on 24 V DC ±10% (IEC 60038). Verify the fail-safe position (open or closed) with the manufacturer.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Purge System
View system integration details

Industrial Ecosystem & Supply Chain Structure

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Vent/Exhaust Valve.

Pressure Relief Valve Purge Valve

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 13 October 2026

Need to Manufacture Vent/Exhaust Valve?

Compare manufacturer profiles with relevant product and process capability.

Create Manufacturer Profile Contact Us
Previous Product
Twin-Screw Polymer Compounding Extruder
Last Product
Get QuotesChat