Clear Check Valve with 1/2 lb. Spring and Unions - 1-1/2" - 1700C15



Part # 1700C15

By Flo Control

  4.45 Average  



Part # 1700C15

Alternate Part #'s 26-350-1140, NDS1700C15

Product Description

Flo Control check valve prevents backflow to protect sensitive equipment from chemical damage.

True union design allows the valve to be disassembled by unscrewing the in-line nuts, leaving the tail pieces cemented to the pipe. The valve body can be removed for visual inspection, repair, or cleaning, making it easy to change the body or spring tension.

Sizes 1½" & 2" IPS
Standard spring tension ½ lb.
EPDM seal and "O" Rings
200 PSI static pressure rating @ 72ºF
Stainless steel spring
Excess solvent trap
Valve body length = 8.345" (body length includes unions)
Valve body length without unions is approx. 5.05".

Product Specifications

1 1/2 in.
1/2 lbs.

?     Asked on 9/30/2019by Leo

I have the 1700 c15 check valve installed between the output of the pump and the input for the filter.It is showing a lot of bubbles. Is this the wrong place to install it? Should I install it in the suction line before the pump? have a 1hp(new from you) motor and pump. Would i be better off with a Jandy type round check valve?

A  Answered on 10/3/2019 by Industry Professional

The air is coming from somewhere, could be a suction leak. Or is there a ozone injector bring O2 into the plumbing. Does your pump lose prime after not running for a period on time. After not running for a period of time is there is the a large number of bubbles being put though the plumbing. If so look for suction side leaks or air being sucked into the skimmer.

?     Asked on 9/14/2019by Bob

Can you tell me the gallons per minute that the check valve allows? We have a Hayward cl200 in line chlorinator that needs 50 gallons per minute to work properly. We had problems maintaining proper chlorine levels even though the pool was balanced properly and the chlorinator had no problems.

A  Answered on 9/19/2019 by Industry Professional

This check valve will allow approx. 65 gpm, exceeding the 50 gpm that you are needing.

?     Asked on 5/28/2019by william Hess

Does the check valve operate correctly regardless whether it is horizontal or vertical?

A  Answered on 5/28/2019 by InyoPools Product Specialist Patrick P.

Hi William, Yes this valve can be operated vertically or horizontally.

?     Asked on 5/27/2019by Leo

What is the difference between the Flo control check valve Clear 1 1/2 in model 1700 C 15 and the Flo control model # 1720 C 15? The appear to be exactly alike.

A  Answered on 5/27/2019 by InyoPools Product Specialist Patrick P.

This 1700C15 is a spring check valve where the 1720C15 is a swing check valve. Basically the insides are different one use a spring and the other uses a flapper.

  • Commented on 6/10/2019 by Product Owner

    Which Check Valve Model, the 1700 C15 or the 1720 C15 Would work best between a pool heater and a Salt Chlorinator system as far as corrosion resistance? Thank you. Mark S. Pitts.

    • Commented on 6/17/2019 by InyoPools Product Specialist Patrick P.

      They both will work fine as they are made out of the same material, the 1700C15 is our most popular check valve.

?     Asked on 5/12/2019by James Colgan

What is the ips of treaded part of 1 1/2 inch valve.(where union part screws onto? Thanks!

A  Answered on 5/13/2019 by Industry Professional

The threads are Female buttress thread on the 1 1/2 union. IPS Iron Pipe thread standard and is not the same thing, IPS is the same as NPT. For union only use 89-350-1100 for just the union. You would use just half of the union and throw the other half away.

?     Asked on 9/17/2018by Bob

Hi, I have the Clear Check Valve 1.5" - 1/2 lb. w/ Unions - 1700C15 that I ordered fron inyo pools. However, I will need new orings for it for next pools season. Would you be able to tell me what to order from you for this?

A  Answered on 9/17/2018 by InyoPools Product Specialist Lennox H.

Hi, Bob. The Union O-ring - 4800-27 is the replacements for this Check Valve. 

?     Asked on 5/12/2018by Inyo Visitor

I am installing a Hayward Heat Pro, calls for a 1/3 lb checkvalve, will this one work?

A  Answered on 5/13/2018 by InyoPools Product Specialist Hector F.

Yes, this check valve should be sufficient. 

?     Asked on 7/4/2017by Bernie

I need a new one of these but mine is vertical and flows down is this correct. It's on the spill over spa line.

A  Answered on 7/4/2017 by InyoPools Product Specialist Alex V.

Bernie, The check valve can be installed vertically or horizontally.

?     Asked on 4/23/2017by Jimmy Voight

How is the rubber o ring inside the check valve suppose to work; in that should the o ring slide back up into the body of the check valve once the pool pump shuts off?

A  Answered on 4/25/2017 by InyoPools Product Specialist Lennox H.

Hi, Jimmy. The black rubber inside of the valve seals the spring shaft so that water does not seep through that part of the valve.

?     Asked on 1/21/2017by Kurt

Can you ship this item to the US Virgin Islands? We have US Postal Service.

A  Answered on 1/24/2017 by InyoPools Product Specialist Lennox H.

Hi, Kurt. We can ship this item to the U.S. Virgin Islands, please provide the quantity and your shipping address so we can send you a quote.

?     Asked on 8/15/2015by tom

my pool piping is 1 1/2" pvc. Will this work with 1 1/2" pvc?

A  Answered on 8/16/2015 by InyoPools Product Specialist Lennox H.

Hi Tom, The Clear Check Valve 1.5" - 1/2 lb. w/ Unions will work with your 1-1/2" plumbing.

?     Asked on 3/20/2015by BILL

I'm losing my prime on pump. How far from the suction side inlet should I place a check valve? Most of the line is under concrete, I only have about a foot of line to access. Will that work?

A  Answered on 3/20/2015 by InyoPools Product Specialist Robert M.

Hello Bill - The check valve can be installed within a few inches of the intake of the pump. A foot of pipe will be sufficient for the check valve install.

?     Asked on 12/1/2014by Inyo Visitor

Does this item come with a warranty? Is there easy access for cleaning?

A  Answered on 12/2/2014 by InyoPools Product Specialist Robert M.

Flo Control model 1700C15 has a one year warranty. This valve can be cleaned easily by removing the valve body from the unions.

?     Asked on 4/23/2013by Guest

Can this check valve be positioned vertically instead of horizontally behind the chlorinator?

A  Answered on 4/23/2013 by InyoPools Product Specialist Patrick P.

Yes, this check valve can be mounted vertically.

?     Asked on 1/18/2012by Guest

Is it possible to purchase just the insert part of this as a replacement?

A  Answered on 1/18/2012 by InyoPools Product Specialist Patrick P.

There is no replacement part for that and you would need to replace the whole unit.

?     Asked on 11/30/2007by Guest

How long is this valve?

A  Answered on 11/30/2007 by InyoPools Product Specialist Patrick P.

According to the manufacturer, the valve is 8.345" long.


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