PHARMACEUTICAL DIAPHRAGM VALVE NDL

Application

The NDL (Non Dead Leg T Valve) diaphragm valves, manually or pneumatically operated, are specially designed for use on aseptic processes in the pharmaceutical industry. The valves are widely used at points of use in the loops of purified water (PW) or water for injections (WFI).

Operating principle

The diaphragm provides the body seal as well as the seat seal. There are no paths to the outside environment and as such the valve is suitable for aseptic processes. As the valve is closed a pressure pad which supports the diaphragm moves towards the sealing face on the body. As the pressure plate moves the diaphragm flexes and is forced down onto the seat area in the centre of the body thus closing off the flow path through the body. The inter-relationship of body to the pressure plate prevents over compression of the diaphragm.The valve can be actuated either manually or pneumatically and controlled by control tops and solenoid valves.
A standard diaphragm valve is used to shut the flow of a line, an NDL type valve shuts only one outlet of the main line. 

Design and features

Comparing with a traditional diaphragm valve, the dead leg of an NDL valve is reduced to a minimum due to the design of the valve, and the pharmaceutical normatives like ASME BPE prioritise this condition.
Broad flexible range based upon a modular design concept with key components being common with other valves.
Autoclavable stainless steel bonnets and handles.
Hygienic design of the handles.
The valve body is machined out of a stainless steel block.
Completely drainable design.
Connections (standard): Clamp OD.
Traceability of components. 

Materials

Parts in contact with the product    AISI 316L
Other st.st. parts                              AISI 304
Standard diaphragm          EPDM according to FDA177.2600
Internal surface finish                        Ra ≤ 0,5 µm
External surface finish                       bright polish

Options

Plastic or stainless steel handle, bonnet and actuator.
Diaphragm: Silicone, Viton®, PTFE/EPDM bonded and PTFE/EPDM separate.
Internal surface finish: Ra ≤ 0,8 µm.
Connections: weld.
Stroke limiters.
Control box with switches and solenoid valves.

Data sheet	ESENFRITDERUPL
Instructions manual	ESENFRITDERUPL