This is high quality polygonal model Breathing Valve.
Textures are not required.
System unit setup used - milimeter.
Rendered in V-Ray.
Gamma 2.2
Object are organized by group.
All objects have materials
All objects have 1:1 scale

In the scene there are 2 V-Ray plane light and 1 V-Ray camera for studio lighting. Click render and you have same image as preview.

Archive included: 3 formats - MAX 2012, OBJ, FBX and matlib.
V-Ray render & materials.
3ds Max 2012 - native application.

Dimensions (mm): W 160 D 160 H 250 mm

The valves are designed for sealing the respiratory gas space in tanks with petroleum and petroleum products, and also to maintain their design values in the internal pressure and vacuum.