Dilution Solutions 1 1/2 in Check Valve

The Dilution Solutions CV112 is a 1-1/2 inch check valve made for use with Dosatron viton seal injector units. Built from poly (polypropylene) construction, it provides a reliable one-way flow barrier that prevents back-siphoning of nutrient concentrate into the water supply line. If you run a Dosatron proportional dosing system at the 1-1/2 inch connection size, this is the purpose-matched check valve for that installation.

CV112 Check Valve Specifications

Specifications are drawn from the manufacturer description and SKU data for the Dilution Solutions CV112 check valve (SKU: DS1.5CV).

Specification	Value
Brand	Dilution Solutions
Model / Part Number	CV112 (SKU: DS1.5CV)
Connection Size	1-1/2 in (1.5″)
Body Material	Poly (polypropylene)
Seal Compatibility	Dosatron viton seal units
Application	Dosatron proportional dosing injector systems

Why Choose the Dilution Solutions CV112 Check Valve

A check valve is a critical component in any injection system that draws concentrate from an open reservoir. Without one, a pressure drop or power interruption can allow nutrient solution to back-siphon into the incoming water line — contaminating the supply or damaging upstream equipment. The CV112 is designed specifically to prevent that in Dosatron-based systems at the 1-1/2 inch connection size.

• Purpose-matched fit: The CV112 is engineered to mate directly with Dosatron viton seal injector units at the 1-1/2 inch connection. No adapter fittings, no improvised workarounds — it installs as a native component of the system.
• Poly construction: The polypropylene body resists corrosion from fertilizer salts, cleaning agents, and the slightly acidic or alkaline solutions common in hydroponic and irrigation applications. It holds up in wet, chemical-heavy environments where metal fittings would corrode over time.
• Prevents back-siphoning: The check valve’s one-way mechanism allows flow only in the intended direction. If line pressure drops — during pump shutdown, valve cycling, or power loss — the valve closes and holds, protecting both the water supply and the Dosatron unit itself.
• Manufacturer-sourced replacement part: The CV112 is a Dilution Solutions component (Dilution Solutions is Dosatron’s North American product line), so it carries the same engineering tolerances as the injector units it pairs with. This matters for long-term seal integrity — off-spec check valves can leak under the pressure cycles a dosing system generates.
• Low-maintenance design: Poly check valves of this class have few moving parts and no external adjustments. Once installed, maintenance is limited to periodic visual inspection and cleaning at standard service intervals.

Compatibility — Dosatron Viton Seal Units at 1-1/2 Inch

The CV112 is specified for use with Dosatron viton seal units that require a 1-1/2 inch connection. Dosatron injectors are available in multiple sizes and seal configurations (viton and EPDM), and not all check valves are interchangeable across those variants. If your injector uses a different connection diameter (3/4 inch or 1 inch are common smaller sizes) or a different seal type, verify the part number before ordering.

Within a properly configured Dosatron system, the check valve installs on the inlet side of the injector — between the incoming water supply and the injector body. This placement ensures the check valve is in line to block any reverse flow back toward the water source. If you are also using a filter on the inlet to protect the injector from particulate, the typical sequence is: water supply → filter → check valve → Dosatron injector. The Dilution Solutions 1-1/2 in filter with 200-mesh screen is the matching filter component for this connection size.

For growers running multiple injection points — for example, separate nutrient and pH-adjustment injectors on a shared supply line — each injector should have its own check valve at its inlet. A single shared check valve upstream of a branch manifold does not provide the same protection.

This check valve is a plumbing accessory, not a metering device. It does not control dose rate or concentration — that is determined by the Dosatron injector ratio setting. Its sole function is to prevent reverse flow when the system is depressurized or between injection cycles.

If you are monitoring water quality in your recirculating or reservoir system, an EC meter such as the Apera Grostar GS3-E replacement EC electrode helps you verify that nutrient concentrations remain consistent across injection cycles — useful for detecting if a compromised check valve has allowed dilution or contamination of the solution.

Installation Guidelines for the CV112

Check valve installation on a Dosatron system is a straightforward plumbing task. The steps below apply to a standard inline installation on a pressurized water supply line.

1. Shut off water supply. Close the upstream isolation valve and relieve any residual pressure in the line before beginning work. Dosatron injectors operate on line pressure, so the line will be under pressure when the system is running.
2. Identify flow direction. The CV112 check valve is directional — it allows flow only from inlet to outlet. Look for the flow-direction arrow molded or marked on the valve body and orient it so flow moves from the water supply toward the Dosatron injector.
3. Install in the correct sequence. Thread or connect the check valve between the incoming supply (or inlet filter) and the Dosatron injector inlet port. Use appropriate thread sealant on threaded connections; do not overtighten poly fittings.
4. Reconnect and test for leaks. Slowly restore water pressure while checking all connection points for drips. Verify the Dosatron injector draws concentrate normally — if the check valve is installed backward, the injector will not prime.
5. Verify system function. Confirm correct dose rate by checking outlet EC against your target value after the system has been running for a few minutes and the line has fully purged.

Sources & Further Reading