# Gate valve

> Steel gate valves to API 600, API 602 and ASME B16.34, tested to API 598, with the specification references and what a gate valve request should include.

URL: https://jjprojectsok.com/products/valves-process-equipment/gate-valve  
Español: https://jjprojectsok.com/es/products/valves-process-equipment/gate-valve  
Updated: 2026-10-16

Linear-motion valve that isolates flow with a wedge or gate. Low pressure drop when open, not for throttling.

**In short:** Linear-motion valve that isolates flow with a wedge or gate. Low pressure drop when open, not for throttling. JJ Projects sources it to the specification the buyer names. Typical reference, standards: API 600 (bolted bonnet steel), API 602 (compact steel), ASME B16.34.

## Specification references

- Standards: API 600 (bolted bonnet steel), API 602 (compact steel), ASME B16.34
- Testing: API 598
- End connections: Flanged (raised face or ring-type joint), butt-weld, threaded or socket-weld
- Body materials: Cast or forged carbon steel, stainless steel; bronze and cast iron for utility service

> Typical references only. The governing specification is the one on your purchase order or datasheet.

## Typical uses

- On and off isolation of process, utility and pipeline sections
- Block valves where low pressure drop in the open position matters
- Isolation of equipment such as pumps and exchangers for maintenance
- Utility service in water, steam and oil systems, in bronze, cast iron or steel

## What to include in a request

A request with these details can be quoted without a round of questions. Send what you have and we will ask for the rest.

1. NPS and pressure class, or the design pressure and temperature
2. Governing standard: API 600 for bolted bonnet steel valves, API 602 for compact valves, or the standard your specification names
3. Body material and trim, for example carbon steel with 13Cr trim, or stainless steel
4. End connections: flanged with raised face or ring-type joint, butt-weld, threaded or socket-weld
5. Bonnet and stem type, for example bolted bonnet, outside screw and yoke (OS&Y), rising stem
6. Operator: handwheel, gear or actuator
7. Service fluid and any sour service requirement, and testing and documents such as API 598 and a body material test report

[Request this item](https://jjprojectsok.com/request-a-quote?item=gate-valve)

## Questions

### Can a gate valve be used to throttle flow?

No. A gate valve is meant to be fully open or fully closed. Left partly open, flow erodes the seats and wedge and can make the gate vibrate. Use a globe valve or a control valve to regulate flow.

### What does OS&Y mean?

Outside screw and yoke. The stem threads sit outside the valve body, away from the fluid, and the stem rises as the valve opens, so the position can be seen from the stem. It is the usual design for steel gate valves in process service.

### What is the difference between API 600 and API 602?

API 600 covers bolted bonnet steel gate valves in the larger range of sizes used in refineries. API 602 covers compact steel gate, globe and check valves in smaller sizes. Your specification names the one that applies.

## Related items

- [Globe valve](https://jjprojectsok.com/products/valves-process-equipment/globe-valve): Globe and angle valves in steel to BS 1873, API 623 and API 602 with ASME B16.34 ratings, and what to include in a globe valve request so it can be quoted.
- [Ball valve](https://jjprojectsok.com/products/valves-process-equipment/ball-valve): Quarter-turn ball valves to API 608 and API 6D with ASME B16.34 ratings, two-way or three-way, and what to include in a ball valve request to quote.
- [Swing check valve](https://jjprojectsok.com/products/valves-process-equipment/swing-check-valve): Swing check valves to API 594, API 6D and API 602 with ASME B16.34 ratings, tested to API 598, and what a check valve request should include.
- [Weld neck flange](https://jjprojectsok.com/products/steel-structural/flange-weld-neck): Forged weld neck flanges to ASME B16.5 and B16.47 in A105, A350 LF2 and A182 grades, and what a flange request needs to state to be quoted properly.

## Guides

- [Valve types and standards: API and ASME B16.34](https://jjprojectsok.com/knowledge/valve-types-and-standards): Gate, globe, ball, check, butterfly and needle valves: what each does, which standards apply (API 600, 602, 6D, 608, 594, B16.34) and how to choose.
- [Flange pressure classes: ASME B16.5 and B16.47](https://jjprojectsok.com/knowledge/flange-pressure-classes): How ASME flange classes 150 to 2500 work: B16.5 vs B16.47, pressure-temperature ratings, facings RF, FF and RTJ, flange types and common materials.
- [Material test reports (MTRs) and EN 10204](https://jjprojectsok.com/knowledge/material-test-reports): What a material test report contains, how EN 10204 types 2.1, 2.2, 3.1 and 3.2 differ, what heat numbers mean, and what to check against the purchase order.

[All valves and process equipment](https://jjprojectsok.com/products/valves-process-equipment)