AD Aperture valve
AD Aperture valve AD Aperture valve AD Aperture valve

Product Parameter


The Series AD valve is the most popular of AKMK's hand operated valve range. The AD is a double diaphragm Iris Valve and is ideal for in-line applications with no leakage to atmosphere.


All body parts are manufactured from stainless steel or aluminium

The Control Ring (Handle) for sizes up to and including 200mm diameter are Gunmetal.

stainless stee triggers and 316 stainless steel screws are used to combat corrosion

Sizes 380mm and 450mm have hand wheel operation as standard


Outlet valve for Silos, Bins, Hoppers and Chutes

Can be used for In-Line applications

Discharge from Sifters, Ribbon Mixers, and Double Cone Blender outlets

For manual bagging of material where frequent operation is involved

Controlling discharge from containers into weigh hoppers


All valve parts can be produced in 316 stainless steel (Except for the AD3)

Flurene or other coatings are available for valves working in corrosive environments

Stainless steel clamp rings

Multi-notching of the valve is available to enhance flow control

Hand wheel operation is available for sizes 150mm to 300mm


The Iris Valve is non jamming

Full bore diaphragm opening (no restriction to product flow)

No mechanical wear of the valve from abrasive products

Diaphragms and liners are easy and inexpensive to replace

Easy valve operation and maintenance

Safe, gentle and strong. Therefore an ideal solution for many diverse applications


The double diaphragm means it is ideal for in-line applications with no leakage of material to atmosphere

Robust construction for medium to heavy duties, handling materials up to 1600 Kg / m³

In-situ Iris diaphragm adjustment reduces maintenance time

Its proven design is suitable for frequent operation

Our large range of diaphragms can suit an enormous range of applications

Bore sizes from 80mm to 450mm



Size/Bore Options

4” to 18” Diameters


Powder, Pellets, Granulars

Connection Options

Standard Flange Pattern, Tube Stub, or Ferrule Couplings

Media Temperature

Up to 150°F (66°C)

Media Pressure/Vacuum

0 psig, Gravity Flow Only

Valve Construction Options

304 or 316L Stainless Steel, and/or Aluminum

Sleeve Material Options

Buna “N”, Teflon, or Urethane


Infinite Position Hand Lever, Quick Lock Hand Lever, or Tote Handle

Position Confirmation

Visual or Proximity Switch

Compliance Approvals


Industry Use

Agriculture, Chemicals, Foods, Minerals, Petrochemicals, Plastics, Textiles