6.1 Control Valve Exercising: Operating Procedures, Back-Off Rules & Frequencies

6.1 Exercising Control Valves Under Direct Supervision

Control-valve operation confirms that a valve can move through its range and return to the normal position. It can also remove fire protection, release water into damaged piping, transmit supervisory signals, and create leakage. For Level I, this is expressly a directly supervised task.

Frequency and preparation

NFPA 25 (2023) Table 13.1.1.2 lists control-valve operation on an annual basis. The detailed control-valve provisions address operation through full travel and return to normal position. Before touching the valve, identify its tag, type, system or area controlled, required normal position, and upstream and downstream consequences.

The impairment coordinator or supervising technician establishes authorization, notifications, temporary safeguards, and alarm-monitoring coordination. Inspect the operator, stem, post, handwheel, access, leakage, corrosion, and securing or supervisory method. Confirm that opening the valve will not charge visibly damaged piping and that closing it will not interrupt unrecognized protection.

OS&Y gate valve

On an OS&Y valve, external stem movement provides visible position indication. Operate smoothly with the proper handwheel and count turns if the procedure requires it. Watch for packing leakage, bent stem, damaged threads, missing lubrication evidence, or abnormal resistance. Do not add a wrench extension or force a stuck valve.

Restore the valve using the approved procedure and verify the normal stem position. Some gate-valve procedures direct a slight back-off from the open stop, but that instruction should not be generalized to every valve. Follow the applicable procedure and manufacturer information for the installed component.

PIV and WPIV

For a PIV or WPIV, use the proper operating wrench or handwheel and observe the target. Full travel can reveal a damaged or disconnected operating mechanism that a target window alone does not show. The procedure may include feeling spring or torsional response at the open position. Stop for free spinning, abrupt loss of resistance, mechanical movement of the post, or a target that does not track operation.

Restore the valve, confirm the target and mechanical response as directed, secure the operator, and verify the supervisory device. Do not rely only on the word OPEN in the window.

Indicating butterfly valve

An indicating butterfly valve typically travels through approximately a quarter turn of the internal disc through a gear operator. Exercise it through the assigned range and restore it to the listed fully open indication. Do not back it away from the open position by habit; that can move the disc into the waterway and may operate the supervisory switch.

Observe the external indicator and switch, but recognize that an indicator does not prove internal condition. Unexpected binding, leakage, damaged gear housing, or inconsistent indication requires documentation and supervisor review.

Status verification and restoration

NFPA 25 requires a valve-status test after a system control valve has been closed and reopened. The applicable main-drain or other verification demonstrates that water-supply status has returned; it does not certify every aspect of system capacity. Use the current procedure and compare with valid prior data.

Restore locks, seals, chains, and electrical supervision. Confirm signals at the panel or receiving point as required. Remove impairment tags only when the coordinator authorizes restoration. Notify all required parties that service is restored.

Documentation

Record valve identifier, location, type, initial and final indication, full travel or turns where required, abnormal force, leakage, mechanical response, security, supervisory result, valve-status test result, and notifications. If the valve cannot complete its travel or normal status cannot be verified, the impairment remains active.

The correct objective is not simply “turn the valve.” It is to control the impairment, observe the mechanism, return the actual valve to its approved normal condition, and prove that protection and monitoring were restored.

Exam focus

The annual operation question is about controlled full travel and verified restoration, not maximum force. Look for answers that establish the impairment process, use the correct tool, stop for abnormal resistance or leakage, restore the specific valve by its approved procedure, perform the required status verification, and confirm both physical and supervisory normal condition. A target, stem, or panel point alone never proves the entire result.

Remember the consequence chain: identify what the valve controls, protect the building while it moves, observe the mechanism, then prove that the waterway and monitoring have returned. If normal status cannot be shown, the impairment is not finished.

Restoration proof

• Correct physical valve indication and security.
• Required valve-status or main-drain verification.
• Cleared local and remote supervision plus completed notifications.