Wilden PX4 series, Engineering, Operation & Maintenance

P E R F O R M A N C E

PX8 HS

 Performance 

17 

WILDEN PUMP & ENGINEERING, LLC

SET

TING 4 PERFORMANCE CUR

VE

EMS CUR

VE

PX8 S

ANIFL

O HS REDU

CED S

TROKE PTFE SIPD-FITTED 

(Sanitary Integrate Piston Diaphragm)

EXAMPLE

A PX8 Sanifl

 o HS, reduced stroke PTFE SIPD-fi

 tted pump operating 

at EMS setting 4, achieved a fl

 ow rate of 197 lpm (52 gpm) using 93 

Nm3/h (55 scfm) of air when run at 4.1 bar (60 psig) air inlet pressure 

and 1.4 bar (20 psig) discharge pressure (See dot on performance 

curve).

The end user did not require that much fl

 ow and wanted to reduce 

air consumption at his facility

.  He determined that EMS setting 3 

would meet his needs.  At 1.4 bar (20 psig) discharge pressure and 

EMS setting 3, the fl

 ow “X factor” is 0.87 and the air “X factor” is 

0.74 (see dots on EMS curve).  

Multiplying the original setting 4 values by the “X factors” provides the 

setting 3 fl

 ow rate of 171 lpm (45 gpm) and an air consumption of 69 

Nm3/h  (41 scfm).  The fl

 ow rate was reduced by 13% while the air con-

sumption was reduced by 26%, thus providing increased effi

 ciency

.

For a detailed example for how to set your EMS, see beginning of 

performance curve section.

Caution:  Do not exceed 8.6 bar (125 psig) air supply pressure.

The Effi

 ciency Management System (EMS) 

can be used to optimize the performance of 

your Wilden pump for specifi

 c applications. 

The pump is delivered with the EMS adjusted 

to setting 4, which allows maximum fl

 ow

. 

The EMS curve allows the pump user to 

determine fl

 ow and air consumption at 

each EMS setting.  For any EMS setting and 

discharge pressure, the “X factor” is used 

as a multiplier with the original values from 

the setting 4 performance curve to calculate 

the actual fl

 ow and air consumption values 

for that specifi

 c EMS setting.  Note: you can 

interpolate between the setting curves for 

operation at intermediate EMS settings.

TECHNIC

AL D

A

T

A

Height 

 . . . . . . . . . . . . . . . . . . . . . . . . . 

1008 mm (39.7”)

Width

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

460 mm (18.1”)

Depth

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

498 mm (19.6”)

Ship W

eight 

 . . . . . . . . . . . . . . . . . . . . . 

49 kg (109 lbs.)

Air Inlet

. . . . . . . . . . . . . . . . . . . . . . . . . . . 

19 mm (3/4”)

Inlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

51 mm (2”) 

Outlet

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

51 mm (2”)

Suction Lift

. . . . . . . . . . . . . . . . . . . . . . 

2.3 m Dry (7.4’)

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

9.0 m W

et (29.5’)

Disp. Per Stroke

. . . . . . . . . . . . . . . . . . 

0.4 l (0.11 gal.)

1

Max. Flow Rate 

 . . . . . . . . . . . . . . . .

405 lpm (107 gpm)

Max. Size Solids 

 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 

   Mushroom V

alve 

 . . . . . . . . . . . . . . . . .

6.4 mm (1/4”)

   Ball V

alve

. . . . . . . . . . . . . . . . . . . . . . .

12.7 mm (1/2”)

Surface Finish 

 . . . . . . . . . . . . . . . . 

Ra 0.8 µm (32 µ-in)

1

Displacement per stroke was calculated at 4.8 bar (70 psig) 

air inlet pressure against a 2 bar (30 psig) head pressure.

Flow rates indicated on chart were determined by pumping water with a vertically mounted, center ported ball check confi

 guratio

n. 

When alternate check valve options are used, multiply fl

 ow rate by appropriate factor: For optimum life and performance, pumps 

should be specifi

 ed so that daily operation parameters fall in the center of the pump performance curve.