Description
DEMCO® Series DT Задвижка
ASME Class 600 / 900 / 1500 — 3″ (80 mm) Full Port — General Service
Product Overview
The DEMCO® Series DT Задвижка is a high-performance, full-bore gate valve designed for general industrial service. With a wedge-shaped gate design and full-port construction, it ensures maximum flow capacity with minimal pressure drop. Available in ASME Class 600, 900, and 1500 ratings, it supports both flanged (RTJ / RF) and threaded end connections, making it versatile for a wide range of oilfield and industrial applications.
Корпус Materials: Aluminum Bronze ASTM B148 Alloy 955 or Stainless Стальной CF8M
Шток Material: 316 Stainless Стальной
Gate Material: Stainless Стальной CF8M
Design Standard: ASME B16.34
Key Features
- Full Port Design: 3″ (80 mm) bore ensures unrestricted flow and easy pigging
- Wedge Gate: Self-aligning wedge gate provides reliable positive sealing in both directions
- Multiple Уплотнение Options: Buna-N, Viton, Hytrel/TEFLON® seat seals to match various media and temperature requirements
- Corrosion-Resistant Construction: Aluminum Bronze or Stainless Стальной body with 316 SS stem for durability in harsh environments
- Flexible End Connections: Available in threaded, flanged RF, and flanged RTJ configurations
- Rising Шток Design: Provides clear visual indication of valve position (open/closed)
- Пружина-Loaded Seats: Maintain consistent sealing force throughout service life
- Low Maintenance: Replaceable seat assembly simplifies field maintenance
Technical Specifications
| Item | Specification |
|---|---|
| Product Series | DEMCO® Series DT |
| Клапан Type | Full Port Задвижка (Rising Шток) |
| Nominal Size | 3″ (80 mm) Full Port |
| Pressure Ratings | ASME Class 600 / 900 / 1500 |
| Design Standard | ASME B16.34 |
| End Connection | Threaded / Flanged RF / Flanged RTJ |
| Корпус Material | Aluminum Bronze ASTM B148 Alloy 955 / Stainless Стальной CF8M |
| Шток Material | 316 Stainless Стальной (Annealed) |
| Gate Material | Stainless Стальной CF8M (ASTM A351) |
| Седло Bore | 3.12″ (79 mm) |
| Уплотнение Options | Buna-N / Viton / Hytrel + TEFLON® / P-10 Insert |
Dimensional Data & Weights
| Dimension | Description | Class 600 | Class 900 | Class 1500 |
|---|---|---|---|---|
| A (Threaded) | End-to-End Length | — | 9.69 in (246 mm) | — |
| A (Flanged RF) | Face-to-Face Length | 14.00 in (356 mm) | 15.00 in (381 mm) | 18.50 in (470 mm) |
| A (Flanged RTJ) | Face-to-Face Length | 14.12 in (359 mm) | 15.12 in (384 mm) | 18.62 in (473 mm) |
| B (Open) | Face-to-Face (Fully Open) | 18.00 in (457 mm) | 18.00 in (457 mm) | 18.82 in (478 mm) |
| C | Седло Bore | 3.12 in (79 mm) | 3.12 in (79 mm) | 3.12 in (79 mm) |
| D | Handwheel Diameter | 14.75 in (375 mm) | 14.75 in (375 mm) | 18.00 in (457 mm) |
| E | Center to Top of Handwheel | 6.81 in (173 mm) | 6.94 in (176 mm) | 7.15 in (182 mm) |
| F | Фланец OD | 8.25 in (210 mm) | 9.50 in (241 mm) | 10.50 in (257 mm) |
| Фланец Bolts | QTY — Size | 8 — 3/4″ | 8 — 7/8″ | 8 — 1-1/8″ |
| RTJ Кольцо Number | API Кольцо Прокладка | R-31 | R-31 | R-35 |
| Weight — Threaded | — | 75 lb (34 kg) | — | |
| Weight — Flanged | 100 lb (45 kg) | 125 lb (57 kg) | 185 lb (84 kg) | |
Working Pressure
| End Connection | Material | Class 600 | Class 900 | Class 1500 |
|---|---|---|---|---|
| Threaded | Bronze | — | — | — |
| Stainless Стальной | — | 2,220 psi | 3,705 psi | |
| Flanged | Bronze | 1,480 psi | 2,220 psi | 3,705 psi |
| Stainless Стальной | 1,480 psi | 2,220 psi | 3,705 psi | |
| Aluminum Bronze | — | 2,220 psi | 3,705 psi |
Note: Working pressures are based on ASME B16.34. Actual values may require temperature derating for specific service conditions.
В сборе Part Number System
DEMCO® Series DT gate valves use a 9-digit part number format JOX8888X6 to identify configuration:
| Position | Description | Options |
|---|---|---|
| 1-2 | Prefix / Series | J — DEMCO; O — Series DT |
| 3 (X) | End Connection | 0 = API LP Threaded | 2 = 600 RTJ | 3 = 600 RF | 4/5 = 900 RF | 6 = 1500 RTJ | 7 = 1500 RF |
| 4 (X) | Корпус Configuration | 4 = Threaded | 7 = Flanged |
| 5,6,7 (8) | Шток / Gate / Седло Кольцо Material | 8 = Stainless Стальной |
| 8 (X) | Седло Insert / Уплотнение | 1 = Buna-N | 2 = Viton | 4 = P-10/Hytrel + TEFLON® | 6 = P-10/Buna-N |
| 9 (6) | Корпус / Bonnet Material | 6 = Aluminum Bronze ASTM B148 Alloy 955 |
Example: J02488886 = DEMCO DT / 900RF / Flanged / Stainless Стальной Trim / Buna-N Seals / Aluminum Bronze Корпус
Parts List
Major components of the DEMCO® Series DT Задвижка assembly:
| Key | Qty | Description | Material Specification |
|---|---|---|---|
| 10 | 1 | Корпус | Aluminum Bronze ASTM B148 Alloy 955 |
| 20 | 1 | Bonnet | Aluminum Bronze ASTM B148 Alloy 955 |
| 30 | 1 | Gate (Wedge) | Stainless Стальной CF8M (ASTM A351) |
| 40 | 1 | Шток | 316 Stainless Стальной (Annealed) |
| 50 | 2 | Седло В сборе (Кольцо + Elastomer + Пружина) | CF8M Кольцо / Elastomer per seal option / Inconel X-750 Пружина |
| 60 | 1 | Handle (Handwheel) | Ductile Iron ASTM A536 Grade 65-45-12 |
| 70 | 1 | Шток Packing Retainer | 316 Stainless Стальной |
| 90 | 1 | Шток Уплотнение В сборе | Buna-N / Viton / TEFLON (per seal option) |
| 100 | 1 | Retainer Snap Кольцо | PH 15-7 Mo |
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