API 6D (TRQ1) — trunnion-mounted ball valves with API 6D monogram, 1–36″, ANSI 150–600
Trunnion-mounted ball valves with the API 6D monogram for natural gas and propane, sizes from 1 to 36 inches, ANSI classes 150, 300 and 600. Double block and bleed, injection ports and a four-level stem barrier. Working temperature from −40 to +100 °C.
- Standards
- API 6D (monogram 6D-0378), CSA Z245.15-17; testing to API 6D section 10, ISO 5208 class A
- DN
- 1–36″ (2″ and larger trunnion-mounted; passport data: 3/4–36″)
- Pressure
- ANSI 150 (285 psi), 300 (740 psi), 600 (1480 psi)
- Temperature
- −40…+100 °C
Price, availability and lead time on request. We help with analogue selection, customs clearance and delivery.
Description
Trunnion-mounted ball valves with double block and bleed and injection ports, type designation TRQ1, are made at a plant in Houston (USA). The plant has held the API 6D monogram licence (number 6D-0378) and a quality system to API Spec Q1 for decades. The valves fully meet the requirements of API 6D and the Canadian standard CSA Z245.15-17. They are intended for natural gas and propane, distribution and transmission pipelines, bypass lines and hot taps.
The range is from 1 to 36 inches, other sizes on request, full bore. ANSI classes 150, 300 and 600 correspond to maximum working pressures of 285, 740 and 1480 psi. Working temperatures are from −40 to +100 °C. All valves from 2 inches are made with a trunnion-mounted ball: the bottom support takes the force from the pressure and holds the ball in a constant position, while sealing is provided by spring-loaded seats. The valve is fully bidirectional and suitable for above-ground and underground installation.
The body is made in two variants. The fully welded, leak-path-free body is preferred for underground installation, while the three-piece bolted body is repairable and preferred for above-ground use. Seats are self-relieving (SPE) or with the double piston effect (DPE, DIB function), and all valves have DBB. The original PMSS (Primary Metal Secondary Soft) seat combines a primary metal seal, which protects the soft element, provides fire resistance and class D to ISO 5208, with a secondary HNBR seal that provides class A. The seat springs are a set of many small springs for even preloading and reduced torque.
The stem has a four-level barrier of three HNBR rings and a PTFE chevron packing, an additional graphite ring for fire resistance, blow-out protection and an antistatic device. Injection ports in the seats (from 4 inches) and in the stem (from 6 inches) are used for flushing, lubrication or emergency sealing, and from 12 inches they have a built-in check valve. The ball is made of A350 LF2 with electroless nickel plating, the stem of AISI 420, the body of A105 or A350 LF2. Testing is carried out to API 6D, section 10, hydraulic for strength and seat tightness, with an additional air test to ISO 5208 class A. The valves are fitted with gearboxes and actuators.
Valves made after November 2022 comply with the 25th edition of API 6D. Fire resistance is tested to ISO 10497, manufacture complies with DOT Title 49, part 192, and every valve is traceable and has a test report.
Technical specifications
| Standards | API 6D (monogram 6D-0378), CSA Z245.15-17; testing to API 6D section 10, ISO 5208 class A |
|---|---|
| DN | 1–36″ (2″ and larger trunnion-mounted; passport data: 3/4–36″) |
| Pressure | ANSI 150 (285 psi), 300 (740 psi), 600 (1480 psi) |
| Temperature | −40…+100 °C |
| Body | fully welded (for underground installation) or three-piece bolted (repairable) |
| Seats | PMSS — primary metal + secondary HNBR; SPE or DPE (DIB) |
| Stem | 4-level barrier: 3 HNBR rings + PTFE chevron packing; graphite ring |
| Injection | ports in the seats (from 4″) and stem (from 6″); internal check valve from 12″ |
| Materials | ball A350 LF2 with ENP, stem AISI 420, body A105 / A350 LF2 |
Request a price and lead time
API 6D (TRQ1) — trunnion-mounted ball valves with API 6D monogram, 1–36″, ANSI 150–600. We reply within one business day.
Or email sales@usk.ua or call 044 339-50-20.
Questions and answers
What sizes and pressure classes are available?
From 1 to 36 inches, other sizes on request. ANSI classes 150, 300 and 600 correspond to 285, 740 and 1480 psi.
Which standards and licences confirm compliance?
The valves comply with API 6D and CSA Z245.15-17, and the manufacturer holds the API 6D monogram with number 6D-0378 and a quality system to API Spec Q1.
How do the body variants differ?
The fully welded, leak-path-free body is preferred for underground installation. The three-piece bolted body is repairable and preferred for above-ground use.
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