PCD
Also called P.C.D · Korean PCD, 피치직경, 피치원 직경
PCD is the diameter of the circle traced by the centre of a rope seated in the sheave groove. The Korean standard calls it the pitch diameter.Korean Elevator Safety Standard, Annex 22 9.2.1
The crane standard uses the terms sheave pitch circle diameter and drum pitch circle diameter.Crane Manufacturing and Safety Standard, Annex 2
Values in the standard
- Traction sheaveThe pitch diameter of traction sheaves, pulleys and drums must be at least 40 times the nominal rope diameter, or 30 times for home lifts.Korean Elevator Safety Standard, Annex 22 9.2.1 Sheave ›
- Governor pulleyThe pitch diameter of the governor pulley must be at least 30 times the governor rope diameter.Korean Elevator Safety Standard, Annex 22 10.2.2.1.3 다) Overspeed governor ›
- Machine tablesSheave Dia in traction machine tables is the diameter of the circle traced by the rope centre, the PCD.D&I traction machine catalog 7쪽 Traction machine ›
- Compensation pulleyThe pitch diameter of the compensation rope tension pulley must be at least 30 times the compensation rope diameter.Korean Elevator Safety Standard, Annex 22 9.6.2 다)
D&D products
14 Sheave. Specifications and drawings are on each product page.D&D public catalog
See all 14 Sheave ›Related terms
Related articles
D&D technical articles that discuss PCD. Articles are not used as sources for the definition.
Sheave enquiriesWeekdays 09:00 to 18:00 KST, by phone or enquiry form.
Sources
- Annex 22: MOIS Notice 2022-18, Elevator Safety Standard, Annex 22 (KC 2050-51:2022). English terms are the ones printed in brackets in Annex 22.
- Crane Manufacturing and Safety Standard, Annex 2.
- D&I Catalog, Traction Machines (E-catalog).
- D&D public catalog
