Frequently Asked Questions (FAQ)

GSI’s flow restrictors are designed to replace capillary tubing, which is hard to handle and easily damaged. And so flow restrictors give a more predictable pressure drop and distribute two-phase refrigerant to a coil. Additionally, GSI’s flow restrictors are known for their versatility in length, end configuration, orifice size, and copper tube bend configuration, their ability to optimize the coil efficiency, and cost-effectiveness.
GSI’s flow restrictors are used on A-coils, slab coils, package air conditioning units, condenser coils, and package heat pump units. Moreover, they can be applied in various industrial processes, such as HVAC, refrigeration, fluid distribution, air pressure lines, plumbing, the petroleum industry, and many more.
Yes, we offer a variety of customization options to meet your unique flow restrictors specifications.
Our products have a one-year warranty on them.
The price of our flow restrictors will depend on a couple of factors, such as the volume of the product ordered, the size of the items included, and so much more. The currency is in both Canadian and American dollars. We offer competitive prices.
The products are mainly manufactured in China, Canada, and the U.S.A.
Yes. Our products meet industry standards such as cULus, ASTM B280, etc.
If it is in stock, it will take 2 to 7 days. If it is being manufactured in North America, it will be about 5 weeks. If the product needs to be manufactured overseas, it will take about 10 to 12 weeks.
We have a dedicated testing department so as to ensure that every product will be tested based on its size, appearance, and performance.
If you want to reach out to us, you can either call us (+1-866-508-0303), fax us (+1-519-448-4884), or email us (at

Flow Restrictors Products We Offer

Flow restrictors

Cost Estimate

We offer a wide variety of flow restrictors, so it is practically impossible to determine their exact price. That said, our flow restrictors can cost more or less 7 RMB (US$ 1) per piece. If you choose to order in bulk, the price will definitely change. The price of our flow restrictors will highly depend on a couple of factors, such as the volume of the order, the material the product is made of, and many more.

Our Process

  1. Submit the number of products to order.
  2. Give a quote. 
  3. The client places an order and deposits the payment for the order.
  4. We deliver the order.

Delivery Time

Naturally, we take as much time as we need in manufacturing our products so that we can provide you with the highest-quality flow restrictors as possible. Oftentimes, if the flow restrictors are in stock in our warehouses, delivering them will only take a few days. But if they are not, delivering them might take a few weeks.
Because of the nature of the manufacturing process, it’s quite difficult to determine the exact delivery time for our products. For this reason, you should expect that the products will take about 30 days from production to delivery. However, even though that is the case, we will always be in touch with you — to update you on the current status of your order. And most importantly, we can assure you that your order will arrive on time.

Why Us?

Our Experience

Ever since the company’s establishment in 2011, Goldstone HVACR Inc. (GSI) has been supplying critically acclaimed flow restrictors for HVAC. Our company has set up offices in both Canada and China so as to enable us to work more efficiently with our customers. In addition to that, by having warehouses in the U.S. and Canada, our customers have the option of blanket ordering flow restrictors from us. Cost reduction through larger quantity purchasing is achieved while reducing inventory expenses at the same time.
With GSI’s efforts in producing the best products and communicating with our customers, the company has become a leading supplier of flow restrictors for HVAC in the industry.

Our Facility

Our factory is one of the largest and most technologically advanced manufacturing centers for flow restrictors in the whole world. In particular, our flow restrictors have been used by some of the biggest names in the HVACR industry.
Experience combined with innovation allows us to create a world-class product that is well-received and trusted all over the world.

Our Quality

Quality control testing is an integral part of offering consistent, warranty-backed flow restrictors for HVAC. Our team of quality control experts in both China and Canada will make sure to check that your product is inspected prior to shipping. For that reason, quality flow restrictors are delivered on time, which is one of the many ways that we continue to offer exceptional customer care experience.

About Us

Design. Production. Delivery. We will be there every step of the way.
Flow restrictors are integral for HVAC systems. For that reason, Goldstone aims to offer a wide variety of flow restrictors for HVAC. In fact, our range of flow restrictors is so wide that you can definitely find the ones that will cater to your specific needs.
The material, manufacturing process, and quality control testing are the foundation in creating well-crafted flow restrictors for HVAC. We combine the highest quality in material with skilled labor in manufacturing our flow restrictors.
In addition to our impeccable manufacturing process, we also have offices in Canada and China. Having offices in these two countries enables GSI to work on the ground with both our customers and our factories. Additionally, it also allows for quick and effective communication between companies and departments.
In addition to having offices in two separate locations, GSI also has warehouses both in the U.S. and Canada. This gives our customers the option of blanket ordering flow restrictors from us. Cost reduction through larger quantity purchasing is achieved while simultaneously reducing inventory expenses.
Time zone differences can be an inconvenience when you wish to speak to somebody right now. Our Canadian office operates in Eastern Standard Time (EST), which allows us to immediately communicate with our North American clients.
Because of all of these efforts to ensure the very best service to our customers, Goldstone HVACR Inc. has become a leading supplier of flow restrictors for HVAC.