Scotch Yoke Fixed Trunnion-Mounted Top Entry Ball Valve with DBB Structure

Valve Type: Scotch Yoke Top Entry Trunnion Mounted Ball Valve
Pressure Rating: ASME Class 600 (Additional pressure classes available upon request: Class 150, 300, 900, 1500, 2500)
Size Range: 2"–64" (DN50–DN1600); larger sizes available upon request
Ball Design: Trunnion Mounted
Body Construction: Forged body with bolted top cover for easy maintenance (Top Entry)
Sealing Design: Double Block and Bleed (DBB)
Seat Material Options: Metal Seat (standard), Soft Seat (for specific applications)
Operating Temperature: -40℃ to 550℃ (dependent on material selection)
End Connection: Flanged RF / RTJ
Operation: Scotch Yoke Pneumatic Actuator
Mounting Interface: ISO 5211 direct mounting available
Materials: WCB, LCB, LCC, WC6, WC9, Stainless Steel, Duplex, Super Duplex, Nickel Alloys
Design Standards: Designed based on API 6D, BS 5351, ASME B16.34 guidelines
Fire-Safe Design: Built in accordance with API 607 / API 6FA fire-safe principles
Sealing Direction: Bi-directional sealing
Brand: SLVCN

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Product Description

Class 600 Scotch YokeTOP Entry Ball Valve

Product Description

SLVCN Class 600 Scotch Yoke Trunnion-Mounted Ball Valve is designed for secure and efficient shutoff in medium to high-pressure pipeline systems. The Double Block and Bleed (DBB) configuration provides reliable bi-directional isolation while allowing bleed cavity pressure monitoring to verify sealing integrity and enhance operational safety.

The top-entry design enables in-line inspection and maintenance without removing the valve from the pipeline, significantly reducing downtime and maintenance costs. Equipped with a Scotch yoke pneumatic actuator, the valve delivers fast response, precise control, and improved energy efficiency, making it well suited for automated process control.

With a metal-seated, fixed ball structure, the valve offers excellent durability under high-pressure, high-temperature, and abrasive service conditions. It is widely applied in oil & gas, chemical, and other critical industrial applications, where long service life, safety, and maintenance efficiency are essential.

Key Features

✓ Real-Time Bleed Cavity Monitoring

DBB visual monitoring via pressure gauge or discharge port, allowing early leak detection for safe operation.

✓ Scotch Yoke Actuator with Precision Control

Dead-zone-free design ensures precise valve synchronization, enabling smooth automated system control.

✓ Low-Torque Fixed Ball Design

Even load distribution reduces operating torque by 40%, extending actuator life and improving valve efficiency.

✓ Wide Temperature Range

Handles temperatures from -40℃ to 550℃, suitable for complex and extreme media.

✓ Fire-Safe Design for Hydrocarbon Service

Fire-safe construction maintains sealing integrity during fire exposure, meeting emergency isolation needs for oil & gas and chemical industries.

Technical Specifications

Technical Specifications Dimensions: Class 600 - Full Port

Size	Bore		Model / Face to Face			D2 in/mm	Weight
NPS/DN	B1 in/mm	B2 in/mm	FT RF in/mm	FT RTJ in/mm	FT BWE in/mm	D2 in/mm	Model FT lb/kg
2"	1.94	1.94	11.5	11.63	11.5	7.5	132
50	49	49	292	295	292	190	60
3"	2.94	2.94	14	14.13	14	9.4	287
80	74	74	356	359	356	240	130
4"	3.94	3.94	17	17.13	17	11.4	529
100	100	100	432	435	432	290	240
6"	5.94	5.94	22	22.13	22	14.6	628
150	150	150	559	562	559	370	285
8"	7.94	7.94	26	26.13	26	20.5	1235
200	201	201	660	664	660	521	560
10"	9.94	9.94	31	31.13	31	20.1	1852
250	252	252	787	791	787	510	840
12"	11.94	11.94	33	33.13	33	22.6	2028
300	303	303	838	841	838	575	920
14"	13.19	13.19	35	35.13	35	26.4	2602
350	334	334	889	892	889	670	1180
16"	15.19	15.19	39	39.13	39	28	3748
400	385	385	991	994	991	712	1700
18"	17.19	17.19	43	43.13	43	29.8	5291
450	436	436	1092	1095	1092	757	2400
20"	19.19	19.19	47	47.25	47	36.4	6724
500	487	487	1194	1200	1194	925	3050
22"	21.19	21.19	51	51.38	51	37.3	9524
550	538	538	1295	1305	1295	947	4320
24"	23.19	23.19	55	55.38	55	42.5	11751
600	589	589	1397	1407	1397	1080	5330

Weight and dimensions for larger valve sizes up to 64" available on request. For more dimensions, please contact us.

Dimensions: Class 600 - Reduced Port

Size	Bore		Model / Face to Face			D2 in/mm	Weight
NPS/DN	B1in/mm	B2 in/mm	GT RF in/mm	GT RTJ in/mm	GT BWE in/mm	D2 in/mm	Model GT lb/kg
2"X11/2"	1.94	1.5	11.5	11.63	11.5	6.5	77
50X40	49	38	292	295	292	166	35
3"X2"	2.94	1.94	14	14.13	14	8.3	154
80X50	74	49	356	359	356	211	70
4"X3"	3.94	2.94	17	17.13	17	10.9	309
100X80	100	74	432	435	432	276	140
6"X4"	5.94	3.94	22	22.13	22	14	584
150X100	150	100	559	562	559	356	265
8"X6"	7.94	5.94	26	26.13	26	16.6	750
200X150	201	150	660	664	660	421	340
10"x8"	9.94	7.94	31	31.13	31	20.1	1323
250X200	252	201	787	791	787	511	600
12"X10"	11.94	9.94	33	33.13	33	22.1	1984
300X250	303	252	838	841	838	561	900
14"X10"	13.19	11.94	35	35.13	35	23.9	2535
350X250	334	252	889	892	889	606	1150
14"X12"	13.19	11.94	35	35.13	35	23.9	2756
350X300	334	303	889	892	889	606	1250
16"X12"	15.19	11.94	39	39.13	39	27	3197
400X300	385	303	991	994	991	686	1450
20"X16"	19.19	15.19	47	47.25	47	32.1	4872
500X400	487	385	1194	1200	1194	816	2210
24"X20"	23.19	19.19	55	55.38	55	37	7628
600X500	589	487	1397	1407	1397	941	3460
28"X24"	26.94	23.19	61	61.5	61	AOR	12743
700X600	684	589	1549	1562	1549	1080	5780
30"X24"	28.94	23.19	65	65.5	65	AOR	13779
750X600	735	589	1651	1664	1651	1130	6250