Section 02.03.03.675 - IRRIGATION LINE CHECK VALVE01.Construction. Construction will: (3-15-22) a. Consist of at least a single check valve; (3-15-22)b. Be heavy duty with all materials resistant to corrosion or protected to resist corrosion; (3-15-22)c. Be spring-loaded with a chemically resistant and resilient seal that provides a watertight seal against reverse flow; (3-15-22)d. Not consist of metal to metal seal surfaces; (3-15-22)e. Be rated at a pressure equal to or greater than the system working pressure; and (3-15-22)f. Be positioned and oriented according to manufacturer specifications to ensure proper functioning. (3-15-22)g. Be located in the pipeline between the irrigation pump and the point of chemical injection into the irrigation pipeline, and downstream from a vacuum relief valve and automatic low pressure drain. (3-15-22)h. Be leveled and on a horizontal plane with deviation of not more than ten (10) degrees from horizontal when installed. (3-15-22)i. Be labeled with the following: (3-15-22) i. Manufacturer's name and model; (3-15-22)ii. Direction of flow. (3-15-22)02.Model Certification. The manufacturer of the irrigation line check valve will provide verification to the director that the valve model has been tested and certified by an independent laboratory such as the Center For Irrigation Technology, Fresno, California and Great Plains Meter, Inc. Aurora, Nebraska, or other Department approved facility as meeting the following leakage test criteria: (3-15-22)a. Low Pressure Drip Test. A check valve withstands for sixteen (16) hours without leakage at the valve seat an internal hydrostatic pressure equivalent to the head of a column of water five (5) feet (1.5m) high retained within the downstream portion of the valve body. No leakage occurs as evidenced by wetting of paper placed beneath the valve assembly. This test is to be conducted with the valve in both the horizontal and vertical position if intended for such use. (3-15-22)b. High Pressure Test. A check valve withstands for one (1) minute, without leakage at joints or at the valve seat, an internal hydrostatic pressure of two (2) times the rate of working pressure of the valve. (3-15-22)Idaho Admin. Code r. 02.03.03.675