By order of the publisher, historical UL documents are not returnable for any reason. Once you place an order for an historical document, we cannot issue a refund, credit, or exchange of any kind.These requirements cover gate valves intended for installation in piping systems supplying water for fire-protection service. Gate valves covered by these
requirements are of the outside-screw-and-yoke type or of the nonrising stem type, the latter for installation either above or below ground.
| Edition : | 7th |
| Published : | 01/01/1994 |
