CARX Combined Air Release Valve (Quick Automatic Air Inlet/Outlet Valve) DN25 40 50 65 80 100

CARX Combined Air Release Valve (Quick Automatic Air Inlet/Outlet Valve) DN25 40 50 65 80 100

Applied to Water Pumps, Tap Water & Municipal Water Supply Systems

Model Meaning

C – Combined TypeA – AutomaticR – Air ReleaseX – Quick / Air Inlet16 – Nominal Pressure PN1.6MPaQ/C/P – Valve Body: Ductile Iron/Carbon Steel/Stainless Steel

Product Features

Three-in-one combined function

Quick air release: Large exhaust hole fully opens during pipeline water filling, quickly discharging large amounts of air and significantly shortening filling time

Micro air release: Automatically discharges dissolved air in water during normal operation to avoid air blockage affecting flow and pressure

Negative pressure air intake: Rapidly inhales air when pump stops or pipeline has negative pressure, preventing pipeline deformation or rupture

Float lever drive for precise operation

Adopts stainless steel float + lever linkage mechanism with high sensitivity, quick response and no jamming

Float specific gravity strictly controlled to ensure accurate operation with minimal pressure change of 0.02MPa

Rubber soft-sealed disc for reliable sealing without leakage

Flow guide protection design for stable operation

Inlet end equipped with flow guide plate to prevent direct water impact on float and improve operation stability

Barrel-shaped valve body with smooth internal flow channel to reduce resistance and prevent debris accumulation

Top dust-proof net prevents external debris from entering valve and extends service life

Various materials for different working conditions

Valve body options: ductile iron (Q), carbon steel (C), stainless steel (P) to meet different media and environmental requirements

Internal parts (float, lever, stem) made of stainless steel for corrosion resistance and long service life

Sealing parts made of EPDM rubber with temperature resistance, aging resistance and compliance with drinking water hygiene standards

Technical Specifications

Nominal Diameter: DN25, DN40, DN50, DN65, DN80, DN100Nominal Pressure: PN10/1.0MPa, PN16/1.6MPaHydrostatic Strength Test Pressure: 1.5×Nominal Pressure (2.4MPa for PN16)Sealing Test Pressure: 1.1×Nominal Pressure (1.76MPa for PN16)Working Temperature: 0~80℃Applicable Medium: Tap water, domestic water, sewage, seawater and other non-corrosive liquidsConnection Method: DN25~DN32: Threaded; DN50~DN100: FlangedAir Release Capacity: Large hole: ≥Pipeline cross-sectional area; Micro hole: 0.5~2L/minAir Intake Capacity: Same as large exhaust hole for rapid air supply

Working Principle

CARX combined air release valve is designed based on buoyancy principle + lever linkage, with three working stages:

Pipeline water filling stage (mass air release): Float stays at the bottom of valve chamber due to self-weight when empty pipe is filled with water, large exhaust hole fully opens, air is discharged at high speed through large hole to shorten filling time

Normal operation stage (micro air release): After valve chamber is filled with water, float rises to the top due to buoyancy and closes large exhaust hole; when dissolved air in water accumulates in valve and lowers water level, float descends accordingly, and micro air is discharged through small hole

Negative pressure protection stage (quick air intake): When pump stops or pipeline has negative pressure, internal pressure is lower than external atmospheric pressure, float drops rapidly, large exhaust hole opens, and external air is inhaled to prevent pipeline damage due to negative pressure

Application Fields

Urban municipal tap water pipe network and secondary water supply

Inlet and outlet pipelines of water pumps and pump stations

Sewage treatment plants and urban drainage systems

Building water supply and fire-fighting water pipelines

Long-distance water transmission pipelines, agricultural irrigation systems and industrial cooling water systems

Installation & Maintenance

Confirm model, pressure and specification match pipeline design before installation.

Must be installed vertically at the highest point of pipeline or air accumulation location, valve body upright with handwheel upward.

Fasten flange bolts evenly and symmetrically to avoid flange deformation affecting sealing.

Install filter before valve to prevent debris from entering and affecting operation.

Regularly check valve operation flexibility, clean internal parts and replace aging seals every six months.

Product Advantages

Three-in-one function: Quick air release, micro air release and negative pressure air intake to comprehensively solve pipeline air problems

High efficiency and energy saving: Eliminate air blockage, improve pump efficiency, reduce energy consumption and operating costs

Safe and reliable: Prevent pipeline deformation and rupture due to negative pressure, protect equipment and system safety

Automatic operation: No manual operation required, float lever mechanism automatically controls air release and intake

Long service life: Stainless steel internal parts + EPDM seals for corrosion resistance, wear resistance and long service life