A zone valve box is not a stock item to be picked from a catalogue. It is the physical interface between the medical gas isolation plan and the rooms it serves. Selecting the wrong box can mean inaccessible valves, mislabeled zones, or a layout that forces costly rework. This article covers the procurement and engineering decisions for zone valve boxes, distinct from the broader isolation strategy or the selection of individual valves.

Start with the isolation plan, not the box

The box must be selected against the approved isolation plan. That plan defines which rooms lose which service when a valve is operated. Before contacting suppliers, obtain a marked floor plan and a schedule of isolation zones approved by the responsible designer. For each box, record the gas or vacuum services, the pipe arrangement, and the required identification of the area served. Without this, any box selection is guesswork.

Key questions for the facility team

Procurement and engineering teams should clarify the following with the qualified facility team and the responsible designer:

• Which services (oxygen, medical air, vacuum, nitrogen, etc.) must be isolated by this box?

• What is the exact pipe size and connection orientation for each service?

• Where will the box be mounted, and what wall conditions exist?

• Who is authorized to access the box, and what access control is required?

• Are any monitoring or alarm components required, and if so, how do they integrate with the existing system?

• What labeling standard is used for zones and services?

These answers will shape the box configuration and prevent incompatible proposals.

Comparison dimensions for proposals

When comparing zone valve box proposals, use drawings rather than catalogue images. Check the number and arrangement of valves, inlet and outlet orientation, enclosure dimensions, materials, labels, and any monitoring components included in the exact model. Clarify who supplies connecting pipework, installation, and site verification. Different box styles may solve different layout constraints, but no style is automatically suitable for every ward. Request current technical documents for the exact model offered, and verify that they match the project requirements.

RFQ checklist for zone valve boxes

Use this checklist to prepare a complete request for quotation:

• Approved isolation zone schedule and marked floor plan

• List of services per box with pipe sizes and connection types

• Required valve type and quantity per service

• Box mounting location and wall construction details

• Access requirements (e.g., locked, tool-operated)

• Labeling and identification specifications

• Monitoring or alarm integration needs

• Required documentation: drawings, materials certificates, installation instructions

• Scope split: who supplies pipework, who installs, who verifies

Including these details in the RFQ reduces back-and-forth and ensures comparable quotes.

Decision boundaries

Zone valve box selection cannot be finalized without the isolation plan. If the plan is not approved, the box configuration remains provisional. Similarly, if wall conditions or access requirements are unknown, the enclosure type and mounting method cannot be confirmed. In these cases, work with the facility team to resolve the missing information before committing to a model. Do not rely on a vendor to infer requirements from a photograph or a generic description.

Working with Kersai

To discuss a matching model and its current technical documents, send the zone schedule and connection drawing. See Kersai's zone valve box range for an overview of listed options. Ask Kersai to identify any configuration differences against the project drawing; final selection must be validated by the responsible designer and facility team.