VY-300 Bolted Bonnet Globe Valve

A straight pattern globe valve for regulating and throttling duty, with a renewable seat ring and a plug profile matched to the service.

Disc moves perpendicular to the seat, so throttling does not cut the seating face

Renewable threaded seat ring instead of a seat machined into the body

Plug, needle and parabolic profiles selected from the stated duty

Back seated stem for packing replacement with the line depressurised

Specifications

Design standard: BS 1873 / ASME B16.34
Nominal size: DN15 – DN300 (NPS 1/2 – 12)
Pressure class: Class 150 / 300 / 600
Body material: ASTM A216 WCB, A351 CF8M, A217 WC6
Trim material: 13Cr, hardfaced plug and seat, or full stainless
End connection: Raised face flange to ASME B16.5, butt weld to B16.25
Operating temperature: -29 °C to +540 °C, body material dependent
Face-to-face: ASME B16.10
Actuation: Handwheel standard, ISO 5211 pad for actuator
Test practice: Shell and seat to API 598

Product detail

A globe valve is the right answer when the line has to be adjusted rather than switched. The flow turns twice inside the body, which costs pressure drop, and in exchange the disc moves perpendicular to the seat so partial opening does not destroy the seating surface. That is the whole trade, and it is worth making whenever a valve is going to sit somewhere other than fully open.

Plug profiles

A plug disc for tight shut-off and general throttling, a needle profile where fine adjustment matters at small openings, and a hardfaced parabolic plug for steam and other erosive service. The profile is chosen from the duty on the enquiry, not from a default in the order form.

Seat ring

Renewable and threaded into the body, so a damaged seat is a spare part rather than a new valve. Hardfaced seating surfaces are standard above Class 300 and available on request below it.

Installation

Flow under the seat unless the datasheet says otherwise, so the packing is not exposed to line pressure with the valve closed. On steam service above roughly DN200 the arrangement is often reversed to reduce the seating force; that is a decision to make at specification, not on site.