Ball Valve 421

DN25-500 PN10-63

Guarantee

Comprehensive Documentation

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Technical Specifications

Nominal diameter DN 25-500
Nominal pressure PN10-63
Medium temperature -29 °C ... +350 °C
Types of Valve End Connections Flanged, Between Flanges
Leakage Class «А»
Mounting Position Any, except for downward-driven devices
Types of Control — manual (handwheel)
— manual (gearbox)
— pneumatic actuation 
— electric actuation
Warranty Period 12 months
Average Service Life 10 000 cycles
Guaranteed Service Life Not less than 5000 cycles

Technical Drawings and Dimensions

Nominal diameter PN16

Table of Basic Dimensions

DN	L, mm	D, mm	b, mm	f, mm	n-ød
25	102	115	16	2	4-M14
32	102	140	18	2	4-M18
40	114	150	18	2	4-M18
50	124	165	20	2	4-M18
65	145	185	20	2	4-M18 / 8M-18
80	165	200	20	2	8-M18
100	194	220	22	2	8-M18
125	194	250	22	2	8-M18
150	229	285	24	2	8-M22
200	243	340	24	2	12-M22
250	297	405	26	2	12-M26
300	338	460	28	2	12-M26
350	400	520	30	2	16-M26
400	400	580	32	2	16-M30
450	520	640	40	2	20-M30
500	600	715	44	2	20-M34

Product Description

Segment valve model 421 is used for controlling and shutting off the flow of the working medium.

The regulating element has the shape of a hemisphere with a V-shaped cutout, providing an equal percentage control characteristic. The selection of sealing and stuffing box materials ensures reliable valve operation at temperatures up to +350 °C. The valve features a low operating torque thanks to the small friction surface between the segment and the body.

Design features of the model:

V-shaped segment with a wide selection of wear-resistant coatings
Equal percentage control characteristic
Easy maintenance (possible replacement of sealing, stuffing box, segment)
Low operating torque
Option for a keyed connection between the segment and the stem
Short face-to-face length

Working medium:

Water, steam, condensate
Phosphoric acid
Sulfuric acid
Pulp
Cellulose
Petroleum products
Chemically aggressive media

Body materials:

🔹 Carbon steels

A216 WCB (1.0619, GP240GH)

🔹 Stainless steels (corrosion resistant)

ASTM A351 CF8 (1.4308) / AISI 304 / A182 F304 (1.4301)
ASTM A351 CF8M (1.4408) / AISI 316 / A182 F316 (1.4401)
A351 CF3 (1.4306) / AISI 304L / A182 F304L
A351 CF3M (1.4409) / AISI 316L (1.4404)
AISI 316Ti (1.4571)
AISI 904L (1.4539)

Segment materials:

ASTM A351 CF8 (1.4308) / AISI 304 / A182 F304 (1.4301)
ASTM A351 CF8M (1.4408) / AISI 316 / A182 F316 (1.4401)
A351 CF3 (1.4306) / AISI 304L / A182 F304L
A351 CF3M (1.4409) / AISI 316L (1.4404)
AISI 316Ti (1.4571)
AISI 904L (1.4539)

Seat materials:

PTFE / PCTFE
PEEK / PTFE
PEEK / Graphite
DEVLON / PTFE
AISI304 / AISI316 / AISI904L / AISI316Ti + stellite / tungsten carbide / hard chrome plating / graphite

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