About Us

We Create Value Through Innovation

Gemini Valve is a privately held, family owned, U.S. manufacturer of automated and manual ball valves and valve-related products for demanding on / off control applications. We draw upon our many years of valve design and manufacturing expertise to provide simple and reliable products and solutions.

Parker & Harper Manufacturing

Gemini Valve’s parent company, a machine shop called Parker & Harper Manufacturing, was founded in Worcester, Massachusetts.

Supporting USA Efforts

All company resources are dedicated to manufacturing ammunition shells for the U.S. during World War II. Over 240 employees are enlisted for 24/7 production.

The Sole Supplier to Remington Arms

Parker & Harper grew to be the largest supplier to Remington Arms for many rifle and shot gun components. They were also the sole supplier for critical components including bolts for model 700, rifle firing pins, shotgun firing pins, magazine tubes and gas cylinders.

The Largest Manufacturer of Ball Valve Components in the U.S.

Customers included Jamesbury, later acquired by Metso, and Worcester Controls, later acquired by Flowserve.

Manufacturer of the First Barstock Ball Valve

In a joint venture with Worcester Controls, the industry’s first barstock valve is manufactured.

Private Label for ITT Grinnell, Stockham Valve & Fitting

Based on the increasing popularity of ball valves over commonly used gate valves, other industry giants seek private label agreements.

Expansion to Raymond, New Hampshire

As a result of our continued growth, a new 50,000 sq. ft. manufacturing location is established in Raymond, New Hampshire.

The Gemini Valve Brand is Created

Using our expertise and knowledge in the manufacture of precision ball valves the Gemini Valve brand is established to meet the growing demand for ball valves in the marketplace.

First Direct-Mount Rack & Pinion Pneumatic Actuator

This patented design provided for valve to actuator rigidity and alignment — two key elements required for long valve seal life, all in an ultra-compact size.

New Hampshire’s First Quality Management Program

Gemini Valve was the first company in New Hampshire to achieve ISO Certification.

Industry Exclusive Valve Design

This design solves many installation and maintenance problems associated with traditional three-piece ball valves. This valve design would eventually be marketed under our Serviceable Series.

Electric Actuation Added to Product Offerings

Gemini starts manufacturing electric actuators for our complete line of ball valves.

Manufacturer of Tube Compression End Ball Valve

A new line of compression end ball valves is introduced, featuring compact actuation.

An AAR® (American Association of Railroads) Registered Facility

In accordance of Federal Regulations at 49 CFR 180 Appendix B, Spec. M-1002 for 1/4” to 2” Tank Car Vent Valves.

NSF® Accreditation

Gemini Valve receives NSF accreditation on many of its valve products for use in commercial food and beverage equipment and machinery.

Start of Worm Drive Electric Actuator Begins

Gemini Valve designs and manufactures a solution for a marketplace seeking compact, fast-acting, high-temperature limit, actuated ball valves.

100,000+ Actuated Ball Valves Record

The first year Gemini Valve manufactures and supplies a record number of actuated valves.

Product Configurator Launched

Our intuitive, easy-to-navigate product configurator is launched on our website to provide the best user experience for those looking for ball valve products.

Our Team

It’s all about teamwork.

Everyone at Gemini Valve works together as a team to deliver great products and exceptional service to our customers. Functioning in an open and supportive environment enables everyone to achieve their personal best, which ultimately benefits our end users. While everyone has a role to play, we all work toward one end goal: 100% customer satisfaction.


Meet Our Team

Our Team

Where We Work

Everything under one roof.

Our corporate headquarters and manufacturing operations are located in the same well-equipped, 60,000-square-foot facility located in southern New Hampshire. We continually invest in the latest technologies to increase productivity and ensure the quality of our products.


See Our Facility

Where We Work
Join Our Team


Gemini Valve’s innovative products continue to drive our growth, and we are always interested in hearing from candidates who are looking for a career opportunity.


If you have a positive attitude and a desire to be part of a winning team we’d like to hear from you. Positions include but not limited to:

  • IT
  • Assembly Technicians
  • CNC Machine Operators
  • CNC Machine Programmers
  • Manufacturing Engineers
  • Design Engineers
  • Machinists
  • Administrative
  • Customer Service
  • Sales
  • Technical Support
  • Quality
  • Facility Maintenance


Benefits include health insurance, paid vacation, paid holidays, bonuses, 401(k), an education reimbursement program and a supportive team working environment.

Inquire Here

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