Bearing carrier realizations:

Bearing carrier	Realization	Comments
SLM NVN / NVE	Standard	Standard length/greased
SLM NVS	Standard	Greased, with deep groove ball bearing
SLM NVO / NVEO	Standard	Oiled, with deep groove ball bearing

 
Close coupled configuration:

Variants	Realization	Comments
SLM NVB / NVEB	Close coupled pump	Motor support stand (without shaft coupling)

 
Suffixes (designs):

H1	heated pump casing
H2	jacketed bearing lantern
S	thermal barrier without secondary seal
W	thermal barrier with secondary seal
F	internal filter
Z, C	isolation shell made of zirconium oxide (Z); isolation shell with CFK plastic cladding (C)
E1	external feed connection, internal secondary-flow boring enclosed
E2	external flushing connection and venting; internal secondary-flow boring non-enclosed
E1F	external secondary flow connection with main flow filter per DGRL
OT	pump without secondary flow (see description of SLM NV OT)
D	double isolation shell
J	inducer
L	Secondary sealing between the anti-friction bearings

 

Design variants

Heated pump H1 and/or H2
The pumps are outfitted with a heat jacket and pump casing (H1) and/or a heat jacket in the bearing lantern (H2). Both heat jackets can be realized either separately or in conjunction with a bypass line. The heat jackets in the standard construction are rated for operating pressure of 16 bar at 200 ?°C (steam) or 6 bar at 350 ?°C. The heat jackets can also be used for cooling.

S or W thermal barrier and secondary seal
The thermal barrier acts as a structural element between the bearing carrier (in the bearing carrier model) or drive motor (in the close coupled model), whereas the hydraulic system allows for heat transfer. This reduces ball bearing temperatures in the gearing when hot liquids are being transported. A radial shaft sealing ring can also be integrated into the thermal barrier for purposes of sealing the magnet driver. The sealing ring acts as a secondary seal that prevents the product from leaking into the environment through a leak in the isolation shell. In order for this secondary seal to be used, the magnet driver chamber must be monitored so that leaks can be detected in good time.

Isolation shell made of zirconium oxide Z

This isolation shell generates no Eddy Current losses in the magnet drive. This isolation shell offers maximum pump effi ciency and is particularly benefi cial where heat input into the pumped liquid is to be avoided.

Plastic isolation shell C

The plastic isolation shell consists of two separate components a?? a carbon fi bre reinforced outer shell, and an inner PTFE liner. The shell eliminates Eddy Current losses and is used to maximise the pumpa??s over-all efficiency, or when a temperature rise of the internal flush flow must be avoided.

External feed and flushing connections E1 and E2
These external connections allow for external flushing, feeding and/or venting. Connection E1 is used in situations where a continuous feed into the magnet drive is desired. Connection E2 is used suitable for short-term flushing, or for external venting of the magnetic coupling.

External recirculation via discharge filter E1F

The self-cleaning discharge fi lter is used for applications where liquids with a moderate percentage of solids are handled. The flush flow is picked up externally from the discharge filter and re-introduced into the magnet coupling. The internal flush flow ports are closed.

Construction without flush flow OT

This construction type is used for applications where liquids with a high percentage of solids are handled. The casing cover is equipped with two external connections for feeding and draining of the isolation shell area. The specially designed journal bearings prevent any solids within the pumped liquid from entering the magnet drive.

Double isolation shell D
The double isolation shell should be used in situations requiring a high level of safety. The unit consists of two interlocking isolation shells, both of which are rated for the relevant operating conditions. If one of the two units is damaged, the casing still remains leaktight. The gap between the two units can be monitored.

Inducer J
Inducers are often used in cases where the installation's NPSH values are extremely low. Inducers substantially reduce pump NPSH throughout the installation without altering pump characteristics. Inducer J can be retrofitted on existing pumps, in most cases with only a minimum amount of pump modification.

Internal filter F

When solids-containing liquids are being transported, the internal filter prevents inadmissibly large particles from entering the flow channels, and from there the magnetic coupling and internal bearings.

Secondary sealing between the anti-friction bearings L

The secondary sealing consists of a highperformance radial shaft seal ring, which ensures that there is no immediate leakage of the liquid to the atmosphere in the drive shaft area in the event of an isolation shell failure.