Sterling

Sterling temperature regulating valves and condensate units are boiler room specialties for heating, cooling and process lines. The 56T and 150-G valves throttle the line they sit in as the temperature at a sensing bulb changes. The condensate units pump returning condensate back to the boiler or feed tank.

BoilerSupplies.com carries both halves of the Sterling line. On the valve side sit the 56T temperature actuated water regulating valve and the 150-G series, D-150/151/152-G for heating service and R-150/151/152-G for cooling service. A regulating valve is chosen by pipe size, temperature range and service, heating or cooling. On the condensate side sit the 4100 G-Series condensate pump and motor and the 4028-G carbon steel condensate return unit. Simplex condensate return tanks, boiler feed and condensate replacement pumps, radiator steam traps and Sterling replacement seals round out the page. A condensate unit or pump is chosen by receiver gallons, pump horsepower, voltage and phase, and the unit it goes into.

Key facts

• The Sterling 56T is a temperature actuated water regulating valve.

• The Sterling 150-G series comes as D-150/151/152-G for heating and R-150/151/152-G for cooling.

• BoilerSupplies.com lists the 4100 G-Series condensate pump and motor and the 4028-G carbon steel condensate return unit.

• BoilerSupplies.com lists Sterling replacement seals, boiler feed and condensate replacement pumps, and radiator steam traps.

• In-stock small-pack orders placed before 2:00 PM EST, Monday through Friday, ship the same day.

What is a temperature actuated water regulating valve also called?

Temperature regulating valve, temperature control valve, self-operated temperature regulator, thermostatic water valve and cooling water valve all describe the Sterling 56T and 150-G. The valve opens or closes the line it sits in as the temperature at its bulb changes, with no outside power. Heating service takes the D-150/151/152-G and cooling service takes the R-150/151/152-G.

Which Sterling 150-G valve do I need, the D or the R?

The D-150/151/152-G is for heating service and the R-150/151/152-G is for cooling service. A heating valve opens as the sensed temperature falls, as on a heating coil. A cooling valve opens as the temperature rises, as on a cooling water line. Then match the pipe size and the temperature range of the valve coming out.

What do you need from me to match a Sterling condensate pump or return unit?

Nameplate first: the unit model (4028-G, 4100 G-Series) and the receiver capacity in gallons. Then simplex or duplex, pump horsepower, voltage and phase, and the discharge pipe size. Note whether it is the complete unit, the pump and motor only, or a seal. Snap the nameplate and the pump mounting and send both.

Can I replace just the pump and motor on my Sterling condensate unit?

Yes, in most cases: the Sterling 4100 G-Series condensate pump and motor is listed as a pump and motor assembly. Boiler feed and condensate replacement pumps and Sterling replacement seals sit on the same page. A receiver that is still tight takes a new pump; one rusted through takes a complete unit such as the 4028-G. Match the pump to the unit's nameplate.

Do I need a condensate return unit or a boiler feed unit?

A condensate return unit if the pump only has to move what comes back from the system to the boiler or a feed tank. It fills a small receiver and pumps on its own float switch. A boiler feed unit if the boiler's level control calls for water on demand from a stored reserve. The Sterling 4028-G is a condensate return unit.

Sterling quotes start with the valve or unit model, the size and the service: send those through BoilerSupplies.com, or phone 1-770-957-9599, toll free 1-800-780-3776.