Plus and PSS Series - Lung Demand Valve
tm 1285.001 - August 2001
3:1
Product Description
The variants of the Plus and PSS Series Lung Demand Valve are as follows:
! Type A - Positive Pressure with Push-In connector to facepiece.
! Type AE - Positive Pressure with M45 Screw-In connector to facepiece.
!!
!!
! Type N - Normal Demand with M40 (Rd40) Screw-In connector to facepiece.
The high performance Lung Demand Valves incorporate a precision factory set
Air Transfer Block Assembly containing a pre-set and sealed balanced piston
unit. These items have unlimited service life.
The Dräger Warranty and Guarantee is void should any attempt be made by
customers to make adjustment to the balanced piston unit or to the associated
Injector Pipe.
Re-adjustment of the main lever setting height will be required following the fitting
of a replacement balanced piston unit to an existing Air Transfer Block, or the fitting
of a replacement Air Transfer Block to an existing balanced piston unit.
The threaded handwheel connector of the screw-in variants (types AE and N)
incorporate a swivel feature (patent pending) and when fitted to the facepiece
this feature allows the demand valve a degree of radial movement during head
and body movement of the wearer. The swivel feature is not however suitable
for constant rotation.
Detachable variants of the lung demand valves have a medium pressure hose
with a quick release male coupling to connect the demand valve to the female
coupling of the medium pressure hose from the pressure reducer of the
appropriate C.A.B.E. (PSS LDV Series are short hose configuration.)
Fixed variants of the lung demand valves incorporate a medium pressure hose
having an end fitting design for connecting directly to the medium pressure
outlet port of the pressure reducer of the appropriate C.A.B.E.
The housing of the lung demand valves are manufactured from a moulded
composite glass filled material that provides a high degree of strength and
durability.
Positive pressure types have a manually operated re-set button to switch ‘OFF’
the positive pressure function - this must be pressed before opening the valve of
compressed air cylinder. First breath inhalation by the wearer will switch ‘ON’
the positive pressure.
All variants include a supplementary air supply facility that is made active by
pressing the centre of the protective rubber cover at the front of the lung demand
valve. Lung demand valves fitted to short duration C.A.B.E. and escape units
will not normally include a supplementary air supply facility.
To Next Page
Loading...
Need help?
General
