6
2.7 Unauthorized Alterations and Production of Spare Parts
Any modification to the machine may only be made after consultation with the manufacturer. Using spare parts and
accessories authorized by the manufacturer is in the interest of safety. Use of other parts may exempt the
manufacturer from any liability.
2.8 Unauthorized Modes of Operation
The reliability of the machine delivered will be only guaranteed if it is used in the manner intended, in accordance with
clause 1 `In General` of this manual. The limit values specified in the data sheet must under no circumstances be
exceeded.
Pending Standards and other Data
DIN4844 Part 1: Safety descriptions and safety signs W8 -
supplement sheet 13
DIN4844 Part 1: Safety descriptions and safety signs W9 -
supplement sheet 14
3. Transport and Storage
Pumps and pump units must not be stored for any length of time in a humid place or where temperatures are below
zero.The storage room should be airy as moisture will damage the motor and thus void the warranty.
Pumps are packed for transportation in cardboard boxes or on pallets. When unpacking, check for damage.
4. Description
4.1 “Pumpmeister”
SPECK piston pumps of the ‘’Büffel’’ pump series have a thoroughly proven double-helical precision gear of
unsurpassed working quietness and service life.
When turned in the correct direction, the gear is lubricated by an oil-dip bath with flooded crosshead. Suction and
discharge connections are on the valve casing and are interchangeable.
Valve casing, air chamber, stuffing box and cylinder cover are of grey cast iron (GG20).
The brass suction and discharge valves (2 of each) are made easily accessible by removing the air chamber. The
suction/discharge line does not have to be removed. The solid conrod is of bronze (G-CuSn10). The brass cylinder
sleeve can be removed using set-screws. The duo-piston is of NBR rubber. Teflon-impregnated packing rings are
used for the piston rod sealing in the stuffing box.
A built-in diaphragm safety valve protects against excess pressure. Water will not flow out of the pump if the pressure
is too high. Surplus water is circulated within the pump, back to the suction side.
4.2 “Büffelpumpe” Pump Unit
SPECK pump units are ‘’Büffelpumpe’’ piston pumps on galvanized horizontal pressure tanks, complete systems
ready for connection. They are equipped with an electric motor, V-belt pulleys, V-belts, belt-guard, automatic air
volume control, pressure switch, pressure gauge and a built-in safety valve.
The automatic air volume control installed in the pressure tank of the unit automatically ensures the correct ratio
between water content and the necessary air cushion.
If the horizontal tank is half full, the valve of the automatic air volume control, activated by the float, opens and the
pump begins conveying both air and water into the tank.
A suction head of approx. 4-6 m is required so that the pump can draw in air in the proper manner.
When water leaves the tank, the pressure in the tank drops until the pressure eventually sinks to the automatic switch-
on point at which the pressure switch turns on the motor/pump. The amount of water which left the tank is then
pumped in again until the switch-off level is attained. This procedure repeats itself again and again at irregular
intervals, depending on how often and how much water is withdrawn from the tank.
4.3 Values for Pressure Switch Adjustment
Pump Unit 4 bar: Switch-On Pressure: 2 bar
Switch-Off Pressure: 3.5 bar
Pump Unit 6 bar Switch-On Pressure: 3 bar
Switch-Off Pressure: 5.5 bar
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