MEP Fittings and Valves Dynamic Blocks Library – Free AutoCAD DWG

This free AutoCAD library brings together the piping fittings, valves and MEP symbols a draughtsman reaches for on almost every plumbing, fire fighting and HVAC drawing. Every item is a dynamic block with plan, side, front and top views built in as visibility states, and every block already carries an integrated wipeout, so it cleanly masks the pipe line behind it without any manual trimming.

The file covers welded black steel and stainless steel fittings, PPR fittings, uPVC fittings, a full valve and instrument set, AC condensate PVC fittings, and a set of electrical, low-voltage and mechanical symbol legends. Sizes run from DN15 up to DN800 for steel, so one file serves everything from a villa water supply layout to a fire pump room header.

What the Library Contains

1. Welded Black Steel and Stainless Steel Fittings

The steel set includes 90° elbow, 45° elbow, equal tee, flange, blind flange and black steel pipe, plus separate tables of reducers and reducing tees. This is the set to use for fire fighting mains, sprinkler risers, fire pump suction and discharge headers, and chilled water distribution.

Item	Nominal OD	Inch Size	DN
1	ø21	1/2″	DN15
2	ø27	3/4″	DN20
3	ø34	1″	DN25
4	ø42	1-1/4″	DN32
5	ø49	1-1/2″	DN40
6	ø60	2″	DN50
7	ø73	2-1/2″	DN65
8	ø90	3″	DN80
9	ø114	4″	DN100
10	ø140	5″	DN125
11	ø168	6″	DN150
12	ø220	8″	DN200
13	ø273	10″	DN250
14	ø324	12″	DN300
15	ø355	14″	DN350
16	ø406	16″	DN400
17	ø457	18″	DN450
18	ø508	20″	DN500
19	ø559	22″	DN550
20	ø610	24″	DN600
21	ø660	26″	DN650
22	ø711	28″	DN700
23	ø762	30″	DN750
24	ø813	32″	DN800

Outside diameters are rounded nominal values for drafting. For fabrication, take exact ODs and wall thicknesses from ASME B36.10M (for example, 8″ pipe is 219.1 mm OD, not 220 mm).

2. PPR Fittings

The PPR set is the most complete part of the library, with 19 fitting types: 90° elbow, 45° elbow, tee, male adapter, male adapter (union), female adapter, female adapter (union), flange, end cap, PPR union, PPR gate valve, elbow female adapter, elbow male adapter, tee female adapter, tee male adapter, socket, PPR pipe and HDPE pipe. A separate table holds reducers and reducing tees.

Sizes run through the standard PPR outside diameters: ø20, ø25, ø32, ø40, ø50, ø63, ø75, ø90, ø110, ø125, ø140, ø160 and ø200 mm, covering DN15 to DN200. This suits domestic hot and cold water distribution in villas, apartments and hotel risers.

3. Valves and Instruments

The valve set covers 17 items in sizes from DN15 to DN300:

• Isolation: gate valve, butterfly valve, brass ball valve, uPVC ball valve
• Non-return: swing check valve, wafer double check valve, silent check valve, foot valve
• Control: pressure reducing valve, float valve, automatic air vent valve
• Line accessories: flexible connector, Y-strainer, water meter
• Instruments: pressure sensor, thermal sensor, pressure gauge

This is the set for pump schematics, tank connections, booster set details and chilled water coil hook-ups.

4. uPVC Fittings

The uPVC set covers tee, tee-bend, wye, 45° elbow, 90° elbow, cleanout, end cap, flange, female adapter, male adapter, P-trap and uPVC pipe, in 15 sizes from DN15 to DN350. Use it for drainage, soil and waste stacks, and irrigation layouts.

5. AC Condensate PVC Fittings

A separate table is set up for split AC and FCU condensate drainage:

• 45° and 90° elbows from DN15 to DN200
• Reducers: DN20×15, DN25×20, DN25×15 and DN32×25
• Reducing and equal tees: DN20×15, DN25×20, DN25×15, DN32×25, DN20 and DN25
• A second tee type in DN15 and DN20
• A 45° Y in DN50×40

Condensate disposal from cooling coils is governed by SBC 501 (Saudi Mechanical Code). Show the traps, slopes and discharge points clearly on the drawing, because consultants routinely comment on them.

6. MEP Symbol Legends

The file also includes five ready-made legend tables:

• Electrical: one-way, two-way, intermediate and dimmer switches; single, double, waterproof and emergency socket outlets; LED downlights, spotlights, chandelier and emergency exit signs.
• Low voltage: TV, telephone, data, LAN, fax and door phone outlets.
• Conduit and fittings: junction boxes, conduit runs and bends, and apartment panels.
• Mechanical supports: cable trays, cable ladders, their elbows and tees, and supports.
• General: direction symbols, up/down arrows, power points and height-above-floor tags.

How the Dynamic Views Work

Each block holds all four views inside one definition. Insert the block, click it, and pick Plan, Side, Front or Top from the visibility grip. You do not need separate blocks for the floor plan and the riser diagram. A gate valve on a plan and the same valve on a section elevation are one block with a different state selected.

This keeps the block count low and makes data extraction reliable. Running DATAEXTRACTION on a drawing gives one clean line per fitting type and size for your bill of quantities, instead of four differently named blocks for the same item.

Why Integrated Wipeout Matters

A fitting drawn over a pipe line normally leaves the line running straight through the symbol. Most draughtsmen then trim or break the pipe at every valve and fitting, which is slow and breaks again as soon as anything moves.

These blocks carry a wipeout object inside the definition, so the pipe line behind the symbol is hidden automatically. Move the valve along the pipe and the mask moves with it. Two things to check:

• Set DRAWORDERCTL to 3 so blocks draw above existing lines.
• If a wipeout frame shows when plotting, set WIPEOUTFRAME to 0 or 2.

Tips for Using the Library on Gulf Projects

• Match the material to the service. Steel fittings suit fire fighting to NFPA 13 (2022 edition) and NFPA 14 (2024 edition), as adopted through SBC 801. PPR suits domestic water, and uPVC suits drainage under SBC 701 (Saudi Plumbing Code).
• Keep sizes consistent with the pipe schedule. The size column uses a combined OD, inch and DN label. Keep the same format in your drawing’s pipe tags so the submittal reads consistently.
• Scale the blocks to the drawing. The blocks are drawn at a nominal symbolic size. Insert at a uniform scale suited to your plot scale, and keep that scale across the whole sheet set.
• Put blocks on the right layers. Before inserting, set layers such as P-DOMW-FITT, P-SANR-FITT or F-PROT-FITT, so fittings can be frozen or recoloured by discipline.

File Details

• Format: DWG
• Software: AutoCAD 2018 and later
• File size: 31.2 MB
• Block type: Dynamic blocks with visibility states and integrated wipeout
• Units: Millimetres

Related Downloads

For individual sets in more detail, see our PP-R fittings, valve CAD blocks and black steel pipe dynamic blocks downloads.

Frequently Asked Questions