Watson McDaniel’s HD series pressure-reducing valves, equipped with the PP (Pressure Pilot) control head, offer a pilot-operated design that delivers high precision and superior downstream pressure stability for industrial steam systems.

 

 

 

 

 

 

 

 

Key features of the HD series with the PP control head include:

Premium Ductile Iron Construction: The main valve body is constructed from ductile iron, allowing for higher safe pressure and temperature ratings compared to standard cast iron.

Superior Precision: Featuring an integrated spring-diaphragm PP control head, the unit regulates outlet pressure with high accuracy (maintaining a tolerance of ±1 PSIG), ensuring stable pressure even amidst fluctuating inlet pressures or steam flow rates.

Integrated Strainer and Blowdown Valve: The design incorporates a full-port strainer and a blowdown valve directly onto the pilot adapter, providing optimal protection for sealing surfaces against pipeline debris and rust.

Hardened Valve Disc and Seat: Internal components are made of hardened stainless steel (55 Rc) for exceptional wear resistance, ensuring a tight seal that meets industrial standards even under harsh operating conditions.

Versatility and Ease of Maintenance: A unique four-bolt pilot mounting design eliminates the need for cumbersome external piping, while the field-reversible system optimizes maintenance time and effort.

Wide operating range: Suitable for main pipeline applications or large heat exchange systems, with outlet pressure ranges that can be flexibly adjusted via selectable springs (such as 3–25 PSIG, 20–100 PSIG, or 80–200 PSIG).
 

Type: HD

Design Pressure: 300 psig (21 barg)

Maximum Inlet Pressure: 300 psig (21 barg)

Outlet Pressure: 3 - 200 psig (0.2 - 14 barg), corresponding pressure ranges from 0.2 to 1.8 barg, from 1.4 to 6.8 barg, from 5.7 to 13.8 barg

Outlet Pressure Stability: 1 psi (0.06 bar) for pilot PP, 0.5 psi (0.03 bar) for pilot PP5

Material: Ductile Iron

Connection to Piping System: 1/2" - 2", NPT Thread

               1" - 6", Flange 150#, 300#

Size: 1/2" - 6"

 

Body dimension: in inches:

 

 

Pilot dimension: in inches:

 

 

Body HD model:

 

 

Pilot Model:

 

 

Typical Application:

 

 

Capacity table:

 

 

TL Plus Engineering specializes in providing comprehensive solutions for saturated steam systems, covering everything from heating system calculations and piping and valve selection—tailored to specific temperature and pressure control applications—to ensuring safe and efficient system operation. The company also develops solutions to calculate and minimize energy losses in saturated steam systems.

Key applications include the use of Watson McDaniel’s HD pressure-reducing valves within saturated steam systems.

 

TL Plus Engineering serves as the exclusive distributor and developer for Watson McDaniel’s US-manufactured valve product lines in the Vietnamese market.