Products > Pilot-Operated Regulators

Pilot-Operated Regulators are more accurate and offer higher capacities than standard direct-operated regulators. They will maintain constant set outlet pressure even when inlet pressure fluctuates or variations in flow occur. With the proper selection of pilots, these regulators will accurately control temperature, pressure or a combination of both.

HD SERIES REGULATING VALVES

Thermodynamic Steamtraps

The Watson McDaniel HD Series Pilot-Operated Regulating Valve features a Ductile Iron body for increased pressure and temperature ratings.  It is ruggedly designed for steam service and can be configured with a variety of pilots or pilot combinations, giving this regulating valve extreme versatility.  Using the Standard “P” Pressure Pilot, outlet pressure can be reduced in the range of 3-200 PSIG, depending on the selected spring.  Maximum operating pressure (PMO) for the HD Regulating Valve is 300 PSIG.



PILOTS for HD SERIES REGULATORS

Thermostatic

These Pilots can all be used with the HD Series Main Valve: 

P” is the Standard Pressure Pilot which has a control pressure range of 3-200 PSIG and +/- 1% accuracy; “P5” is a Special Pressure Pilot which has a control pressure range of 1-25 PSIG and +/- 0.5% accuracy.

T” is the Standard Temperature Pilot which has a temperature control range of 60-260 °F.

TRP” is a Special Temperature Pilot which has a temperature control range of 20-250 °F. 

A” is the Air Pilot which has a control pressure range of 3-200 PSIG. 

DP” is the Differential Pressure Pilot which has an outlet pressure control range of 3-200 PSIG.

BP” is the Back Pressure Pilot which has a back pressure control range of 10-200 PSIG. 

S” is the Solenoid Pilot which is used for electrical On/Off control of the HD Valve. 

Note: Overall pressure and temperature ranges are given above; actual ranges will depend on selected spring, sensing bulb or specific Air Pilot diaphragm (A1, A4 or A6).  Consult specification sheets.



PNEUMATIC TEMPERATURE CONTROLLERS

Thermostatic

The PTL and PTR Pneumatic Temperature Controllers are used in conjunction with an “A” Air Pilot to control the operation of the HD Regulator.  The PTL uses a bi-metallic element to sense temperature and the PTR uses a hydraulically filled bulb with a 4-ft. capillary to sense temperature.  The air supply is connected to the inlet of the controller and the air output signal is fed directly to an Air Pilot, which controls the opening and closing of the steam regulating valve.  These controllers operate over a wider temperature range than our standard “T” Temperature Pilot.  They also react quicker to temperature changes which make them an excellent choice for instantaneous hot water applications.



HD REGULATORS with COMMON PILOTS


Model HDP (HD Valve with “P” or “P5” Pressure Pilot) is used to regulate outlet pressure in the range of 3-200 PSIG with the “P” Pilot or 1-25 PSIG with the “P5” Pilot. 

Model HDT (HD Valve with “T” Temperature Pilot) is used to regulate temperature in the range of 60-260 °F.

Model HDA (HD Valve with “A” Air Pilot) is used to regulate outlet pressures in the range of 3-200 PSIG. 

Model HDPT (HD Valve with “P” or “P5” Pressure Pilot and “T” Temperature Pilot) is used to regulate outlet pressure in the range of 3-200 PSIG with the “P” Pilot or 1-25 PSIG with the “P5” Pilot, and temperature in the range of 60-260 °F. 

Note: Overall pressure and temperature ranges are given above; actual ranges will depend on selected spring, sensing bulb or specific Air Pilot diaphragm (A1, A4 or A6).  Consult specification sheets.



HSP SERIES PRESSURE REGULATORS

The Watson McDaniel HSP Series Pressure Regulating Valve is constructed of Cast Carbon Steel for higher pressure and temperature ratings.  With a built-in spring-adjusted pressure pilot, this valve is specifically designed for general purpose steam pressure reducing applications.  Outlet pressure can be reduced in the range of 10-300 PSIG, depending on the selected spring.  Maximum operating pressure (PMO) for HSP Regulating Valve is 450 PSIG.



NOISE ATTENUATORS

Noise Attenuation Equipment is used to reduce unwanted or excessive noise that commonly occurs in pressure reducing stations.  Watson McDaniel Series-A, Series-H & Series-S Noise Attenuators are used in conjunction with Pressure Regulating Valves to provide noise attenuations in the range of 5-30 dBA.

 

Products > Pilot-Operated Regulators

Try Our Online Sizing & Selection Program!

Call, Fax or E-mail Us to Receive our Latest Product Catalog.

Questions? Contact us for your application needs.

Special requirements? Watson McDaniel can custom-engineer condensate pumping systems to meet your specific needs

Product Literature:

Product Catalog - Pilot-Operated Regulating Valves

Typical Regulator & Pilot Combinations

Over-Pressure Protection Methods

Noise Attenuators

Capacities for sizing of HD & HSP Series Regulators

Regulating Valve Applications