ES Constant Company - Industrial Steam Specialists

Our commercial customers include hospitals (OHSU Oregon Health & Science University, Providence Hospital), colleges (University of Oregon, University of Washington) military installations (McChord AFB, Fort Lewis, Naval Station Kitsap), as well as Amgen, Boeing, the Washington Athletic Club, and MacDonald Miller, Seattle Construction Division.

Commercial Products

Always Innovating, Always Improving

Modine Manufacturing Company has been leading the way in thermal management since 1916. We design, manufacture and test heat transfer products for a wide variety of applications and markets. We're at work in practically every corner of the world, delivering the solutions our customers need, where they need them.

Thrush Co Inc.
Thrush Co. Inc.
Hydronic Specialties, Pumps, Hot Water Heaters, Pressure Boosters, Heat Exchangers

In 1923 Homer A. Thrush committed himself to developing superior hot water heating systems. The Thrush Water Circulator was first introduced to the growing hydronics industry in 1928. This innovation brought the advantages of hot water heat to virtually every home and business. Mr. Thrush pioneered many innovations that have contributed to the comfort and well-being of mankind. Established in 1997, Thrush Co. Inc., named after Homer A. Thrush in commemoration of his innovative spirit, has been recognized as a leading pioneer in the hydronics industry. Our worldwide network of representatives and distributors, as well as our in-house service department, are available to meet your needs and insure your satisfaction. When you need heating and cooling products, think Thrush.

Spence Engineering
Spence Engineering
Pressure and Temperature Regulators, Control Valves, Relief Valves, Strainers

In 1925, Paulsen Spence was inspired to design the first normally closed, pilot-operated, diaphragm actuated pressure regulator, the Spence Type ED. The Spence pilot-operated pressure regulator revolutionized the way energy producers supplied low-pressure steam to their customers by providing greatly improved accuracy in pressure control. This feature, as well as dependability and low maintenance, soon made pilot-operated regulators the standard method of pressure reducing and control throughout the steam industry. In recognition of the company's contribution to the nation's war efforts, the Spence Engineering Company received the coveted Army-Navy Award for production efficiency. Paulsen Spence's many inventions (over 60 patents) were: The Type ED packless main valve with external pressure pilot, Type T14 Temperature sensing pilot, Types T124 and T134 combination pressure and temperature control pilots, Type back pressure pilot, Type N differential pressure pilot, Types P and Type F46 pump pressure pilots and various pneumatic pilots. Spence's pilot-operated pressure and temperature regulators were the blueprints for many of the externally pilot-operated regulators manufactured and sold in the world today. Although there have been some changes to the materials and configuration of his inventions, the overall design and operating principals have remained the same since their inception 80 years ago.

Nicholson Steam Trap
Nicholson Steam Trap
Steam Traps

Spence Engineering acquired the Nicholson Steam Trap line of industrial and process steam traps in 1989. In 1999, Nicholson Steam Trap receives the ISO-9001 certification as manufacturers of fluid control and steam specialty devices.

Reco USA
Reco USA
Gas Hot Water Heaters, Pressure Vessels

Located on 15 acres in Cayce, South Carolina, our facilities feature 105,000 square feet under one roof. Our machinery includes the latest in welding, cutting, and forming equipment, and we offer engineering assistance using state-of-the-art PC based CAD Systems. This not only assures you quality engineering, but also results in faster turnaround. To complete your job to quality standards, we rely on a work force of 105 highly skilled professionals, including supervisors, professional engineers, draftsmen and shop inspectors.

Tunstall Corporation
Tunstall® Corporation
Steam Products

Since 1958, Tunstall® Corporation has provided customers with outstanding, cost-effective solutions in an energy conscious world. With our reputation for quality, service and innovation, it's no surprise that we've built a group of loyal customers -- colleges, universities and state government institutions -- that consistently choose Tunstall for their steam heating requirements.

Miljoco Corporation
Miljoco Corporation
Temperature and Pressure Indicating Instruments

Miljoco Corporation is a leading international manufacturer of temperature and pressure indicating instruments used in the refrigeration, food service, commercial HVAC, and industrial processing industries.

Warren Controls
Warren Controls
Dependable, Rugged, Precision Control Valves and Accessories

Warren Controls has been in the valve business for 50 years, serving a wide variety of commercial, industrial, military and OEM customers. Our strengths lie in our ability to ensure that we are meeting the needs of the application, providing personal service and flexibility to meet our customer’s needs.

Warren offers four broad product lines for Building Automation Control Valves, Industrial Process Valves up to ANSI Class 300, Mechanical Level Controls for deaerators and boilers, and Military / Marine Valves to MIL specifications.

UO Group
UO Group
Your Full Service Industrial, Energy, and Marine Contractor

We are a “Steam Solutions” Construction Company meeting the mills need to optimize energy cost and maximize steam usage. We accomplish this through steam joints, syphons, condensate return systems, and thermocompressors.

Clamp-on Ultrasonic Flow Meters, Heat Calculators and Thickness Gauges

Micronics has been manufacturing clamp-on ultrasonic flow meters, both fixed and portable, since 1985. In that time they have developed one of the most accurate and user friendly transit time flow meters on the market.

RG Laurence
2-Way and 3-Way Rotary On/Off Control Valves

Laurence is a leading brand of fast-acting on-off control valves for process industries that are proven to perform in demanding, high temperature conditions.

Leslie Controls, Inc.
A premier manufacturer of Control Valves and Instrumentation

It has been one hundred years since Canadian born John Leslie advertised his first major product, a steam powered snowplow for railroad locomotives. Leslie's product lines have grown significantly over the last century and now include a wide variety of products to cover almost any need for power plants, processing and HVAC to Navy Ships.

Portland Office

TEL 503-255-7660
FAX 503-255-7914
sales [at] esconstant [dot] com

Kent Office

TEL 253-529-1572
FAX 206-653-7500
EMAIL richard [at] esconstant [dot] com