A valve with a bellows to seal off the stem enclosure is an ideal choice whenever leakage to the atmosphere is intolerable due to toxicity, chemical corrosion, radioactivity, other health or ecological reasons. In addition, seal welding the body-bonnet seal makes the valve hermetically sealed. The bellows is welded to the stem and to the bottom of the bonnet.

 

It is applicable to the cutting and connection of pipelines medium that are used in various industries such as flue gas uerification plant, gas supply pipeline, vacuum facilities, ammonia facilities, hot water, colding & freezing system, heating technology, steam system, chemical industry, pharmacy, chemical fertilizer, electric power industry etc. The nominal pressure can be fromm 1.0 Mpa to 16.0MPa and the working temperature can be reached to 350 Celsius degree.

 

Main Structural features

1. This product has logical strucure, reliable seal, excellent performance and nice design.

2. The seal surface is overlay welded with hard chrome ally material which is attrition resistant,  corrosion ressistant, has good friction resistant and long life.

3. The stem is quenched and tempered, and its surface is treated by nitriding treatment, thus it has good corrosion resistant and friction resistant.

4. It has double seal capability, thus is more reliable for zero leakage warranty.

5. The stem show the position indicator, thus it is clearer.

Technical specification

Structural formation	BB, BG, OS&Y
Driving maner	Handwheel or motor operated
Design standard	DIN 3356
Face to face	DIN 3202
Flange ends	DIN 2543-2545
Butt-welding	DIN 3239
Test and inspection	DIN 3230

Products performance specification

Nominal pressure	Shell test (MPa)	Sealing test (MPa)	Suitable temperature	Suitable medium
(Mpa)
1.6	2.4	1.76	No more than 350oC	Water oil & gas
2.5	3.75	2.75
4	6	4.4

Main parts materials

Dimensions and weight for PN16 Nominal pressure

Size	mm	15	20	25	32	40	50	65	80	100	125	150	200	250	300	350
L	mm	130	150	160	180	200	230	290	310	350	400	480	600	730	850	980
H	mm	195	200	220	225	235	250	260	265	370	400	515	550	600	630	680
W	mm	130	130	130	130	150	150	180	180	200	200	400	450	450	500	500
Weight	KG	4	4.5	5	7	9	12.5	18	23	41	54	90	160	260	411	610

Dimensions and weight for PN25 Nominal pressure

Size	mm	15	20	25	32	40	50	65	80	100	125	150	200	250	300	350
L	mm	130	150	160	180	200	230	290	310	350	400	480	600	730	850	980
H	mm	195	200	220	225	235	250	260	265	370	400	515	550	600	630	680
W	mm	130	130	130	130	150	150	180	180	200	200	400	450	450	450	450
Weight	KG	4	4.5	5	7.5	9.5	13	19	24	43	57	95	168	300	510	680

Dimensions and weight for PN40 Nominal pressure

Size	mm	15	20	25	32	40	50	65	80	100	125	150	200	250	300	350
L	mm	130	150	160	180	200	230	290	310	350	400	480	600	730	850	980
H	mm	195	200	220	225	235	250	260	265	370	400	515	550	600	630	680
W	mm	130	130	130	130	150	150	180	180	200	200	400	450	450	500	500
Weight	KG	4	4.5	5	8	10	13.5	20	25	45	60	98	171	340	580	780