From fb90653cdb0f1264943fd4dfb2457bed5c434321 Mon Sep 17 00:00:00 2001
From: matthew-kapp <mattkapp.python@gmail.com>
Date: Wed, 5 Mar 2025 16:56:03 +0200
Subject: [PATCH 1/6] unit removed from VariableResistor - all tests pass now

---
 src/Electrical/Analog/ideal_components.jl | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/src/Electrical/Analog/ideal_components.jl b/src/Electrical/Analog/ideal_components.jl
index a4896446d..ef3775727 100644
--- a/src/Electrical/Analog/ideal_components.jl
+++ b/src/Electrical/Analog/ideal_components.jl
@@ -391,11 +391,9 @@ R = R_const + pos * R_ref * (1 + alpha * (port.T - T_ref))
     end
 
     @parameters begin
-        R_ref = 1.0,
-        [description = "Resistance at temperature T_ref when fully closed (pos=1.0)",
-            unit = "Ω"]
-        T_ref = 300.15, [description = "Reference temperature", unit = "K"]
-        R_const = 1e-3, [description = "Constant resistance between p and n", unit = "Ω"]
+        R_ref = 1.0, [description = "Resistance at temperature T_ref when fully closed (pos=1.0) (Ω)"]
+        T_ref = 300.15, [description = "Reference temperature (K)"]
+        R_const = 1e-3, [description = "Constant resistance between p and n (Ω)"]
     end
 
     @components begin
@@ -404,13 +402,13 @@ R = R_const + pos * R_ref * (1 + alpha * (port.T - T_ref))
 
     @variables begin
         pos(t), [description = "Position of the wiper (normally 0-1)"]
-        R(t), [description = "Resistance", unit = "Ω"]
+        R(t), [description = "Resistance (Ω)"]
     end
 
     if T_dep
         @parameters begin
             alpha = 1e-3,
-            [description = "Temperature coefficient of resistance", unit = "K^-1"]
+            [description = "Temperature coefficient of resistance (K^-1)"]
         end
         @components begin
             port = HeatPort()

From 7e01d58cb08f0d053efb1c63df8cc3eaf1c8cf77 Mon Sep 17 00:00:00 2001
From: matthew-kapp <mattkapp.python@gmail.com>
Date: Wed, 5 Mar 2025 19:52:05 +0200
Subject: [PATCH 2/6] Reopen PR #362

---
 docs/src/assets/Project.toml                  | 22 ++++++++++++
 .../IsothermalCompressible/components.jl      | 36 ++++---------------
 .../IsothermalCompressible/sources.jl         |  2 +-
 src/Hydraulic/IsothermalCompressible/utils.jl |  6 +---
 4 files changed, 31 insertions(+), 35 deletions(-)
 create mode 100644 docs/src/assets/Project.toml

diff --git a/docs/src/assets/Project.toml b/docs/src/assets/Project.toml
new file mode 100644
index 000000000..e6c6be7c7
--- /dev/null
+++ b/docs/src/assets/Project.toml
@@ -0,0 +1,22 @@
+[deps]
+ControlSystemsBase = "aaaaaaaa-a6ca-5380-bf3e-84a91bcd477e"
+DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
+DataInterpolations = "82cc6244-b520-54b8-b5a6-8a565e85f1d0"
+DifferentialEquations = "0c46a032-eb83-5123-abaf-570d42b7fbaa"
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
+IfElse = "615f187c-cbe4-4ef1-ba3b-2fcf58d6d173"
+ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"
+ModelingToolkitStandardLibrary = "16a59e39-deab-5bd0-87e4-056b12336739"
+OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
+Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
+
+[compat]
+ControlSystemsBase = "1.1"
+DataFrames = "1.7"
+DataInterpolations = "6.4, 7"
+DifferentialEquations = "7.6"
+Documenter = "1"
+IfElse = "0.1"
+ModelingToolkit = "9"
+OrdinaryDiffEq = "6.31"
+Plots = "1.36"
diff --git a/src/Hydraulic/IsothermalCompressible/components.jl b/src/Hydraulic/IsothermalCompressible/components.jl
index be891ee4c..1ca63150c 100644
--- a/src/Hydraulic/IsothermalCompressible/components.jl
+++ b/src/Hydraulic/IsothermalCompressible/components.jl
@@ -1,12 +1,9 @@
 
 """
-    Cap(; p_int, name)
+    Cap(; name)
 
 Caps a hydraulic port to prevent mass flow in or out.
 
-# Parameters:
-- `p_int`: [Pa] initial pressure (set by `p_int` argument)
-
 # Connectors:
 - `port`: hydraulic port
 """
@@ -24,13 +21,10 @@ Caps a hydraulic port to prevent mass flow in or out.
 end
 
 """
-    Open(; p_int, name)
+    Open(; name)
 
 Provides an "open" boundary condition for a hydraulic port such that mass flow `dm` is non-zero.  This is opposite from an un-connected hydraulic port or the `Cap` boundary component which sets the mass flow `dm` to zero.  
 
-# Parameters:
-- `p_int`: [Pa] initial pressure (set by `p_int` argument)
-
 # Connectors:
 - `port`: hydraulic port
 """
@@ -226,12 +220,11 @@ end
 @deprecate Pipe Tube
 
 """
-    FlowDivider(;p_int, n, name)
+    FlowDivider(; n, name)
 
 Reduces the flow from `port_a` to `port_b` by `n`.  Useful for modeling parallel tubes efficiently by placing a `FlowDivider` on each end of a tube.
 
 # Parameters:
-- `p_int`: [Pa] initial pressure
 - `n`: divide flow from `port_a` to `port_b` by `n`
 
 # Connectors:
@@ -313,14 +306,11 @@ end
 end
 
 """
-    Valve(reversible = false; p_a_int, p_b_int, area_int, Cd, Cd_reverse = Cd, minimum_area = 0, name)
+    Valve(reversible = false; Cd, Cd_reverse = Cd, minimum_area = 0, name)
 
 Valve with `area` input and discharge coefficient `Cd` defined by https://en.wikipedia.org/wiki/Discharge_coefficient.  The `Cd_reverse` parameter allows for directional flow restriction, making it possible to define a check valve.
 
 # Parameters:
-- `p_a_int`: [Pa] initial pressure for `port_a`
-- `p_b_int`: [Pa] initial pressure for `port_b`
-- `area_int`: [m^2] initial valve opening
 - `Cd`: discharge coefficient flowing from `a → b`
 - `Cd_reverse`: discharge coefficient flowing from `b → a`
 - `minimum_area`: when `reversible = false` applies a forced minimum area
@@ -507,7 +497,7 @@ See also [`FixedVolume`](@ref), [`DynamicVolume`](@ref)
 end
 
 """
-    DynamicVolume(N, add_inertia=true; p_int,  area, x_int = 0, x_max, x_min = 0, x_damp = x_min, direction = +1, perimeter = 2 * sqrt(area * pi), shape_factor = 64, head_factor = 1, Cd = 1e2, Cd_reverse = Cd, name)
+    DynamicVolume(N, add_inertia=true; area, x_int = 0, x_max, x_min = 0, x_damp = x_min, direction = +1, perimeter = 2 * sqrt(area * pi), shape_factor = 64, head_factor = 1, Cd = 1e2, Cd_reverse = Cd, name)
 
 Volume with moving wall with `flange` connector for converting hydraulic energy to 1D mechanical.  The `direction` argument aligns the mechanical port with the hydraulic port, useful when connecting two dynamic volumes together in oppsing directions to create an actuator.
 
@@ -680,14 +670,11 @@ dm ────►               │  │ area
 end
 
 """
-    SpoolValve(reversible = false; p_a_int, p_b_int, x_int, Cd, d, name)
+    SpoolValve(reversible = false; Cd, d, name)
 
 Spool valve with `x` valve opening input as mechanical flange port and `d` diameter of orifice. See `Valve` for more information.
 
 # Parameters:
-- `p_a_int`: [Pa] initial pressure for `port_a`
-- `p_b_int`: [Pa] initial pressure for `port_b`
-- `x_int`: [m] initial valve opening
 - `d`: [m] orifice diameter
 - `Cd`: discharge coefficient flowing from `a → b`
 
@@ -727,18 +714,13 @@ See [`Valve`](@ref) for more information.
 end
 
 """
-    SpoolValve2Way(reversible = false; p_s_int, p_a_int, p_b_int, p_r_int, m, g, x_int, Cd, d, name)
+    SpoolValve2Way(reversible = false; m, g, Cd, d, name)
 
 2-ways spool valve with 4 ports and spool mass. Fluid flow direction S → A and B → R when `x` is positive and S → B and A → R when `x` is negative. 
 
 # Parameters:
-- `p_s_int`: [Pa] initial pressure for `port_s`
-- `p_a_int`: [Pa] initial pressure for `port_a`
-- `p_b_int`: [Pa] initial pressure for `port_b`
-- `p_r_int`: [Pa] initial pressure for `port_r`
 - `m`: [kg] mass of the  spool
 - `g`: [m/s²] gravity field acting on the spool, positive value acts in the positive direction
-- `x_int`: [m] initial valve opening
 - `d`: [m] orifice diameter
 - `Cd`: discharge coefficient flowing from `s → a` and `b → r`
 
@@ -788,8 +770,6 @@ end
 
 """
     Actuator(N, add_inertia = true, reversible = false;
-        p_a_int,
-        p_b_int,
         area_a,
         area_b,
         perimeter_a = 2 * sqrt(area_a * pi),
@@ -819,8 +799,6 @@ Actuator made of two DynamicVolumes connected in opposite direction with body ma
 
 # Parameters:
 ## volume
-- `p_a_int`: [Pa] initial pressure for `port_a`
-- `p_b_int`: [Pa] initial pressure for `port_b`
 - `area_a`: [m^2] moving wall area of volume `A`
 - `area_b`: [m^2] moving wall area of volume `B`
 - `length_a_int`: [m] initial wall position for `A`
diff --git a/src/Hydraulic/IsothermalCompressible/sources.jl b/src/Hydraulic/IsothermalCompressible/sources.jl
index ee21959d7..d5d64f5f3 100644
--- a/src/Hydraulic/IsothermalCompressible/sources.jl
+++ b/src/Hydraulic/IsothermalCompressible/sources.jl
@@ -1,5 +1,5 @@
 """
-    MassFlow(; name, p_int)
+    MassFlow(; name)
 
 Hydraulic mass flow input source
 
diff --git a/src/Hydraulic/IsothermalCompressible/utils.jl b/src/Hydraulic/IsothermalCompressible/utils.jl
index 425686d1f..165c6adc1 100644
--- a/src/Hydraulic/IsothermalCompressible/utils.jl
+++ b/src/Hydraulic/IsothermalCompressible/utils.jl
@@ -4,14 +4,10 @@ regPow(x, a, delta = 0.01) = x * (x * x + delta * delta)^((a - 1) / 2);
 regRoot(x, delta = 0.01) = regPow(x, 0.5, delta)
 
 """
-    HydraulicPort(;p_int, name)
+    HydraulicPort(; name)
 
 Connector port for hydraulic components.
 
-# Arguments:
-
-- `p_int`: [Pa] initial gauge pressure
-
 # States:
 - `p`: [Pa] gauge total pressure
 - `dm`: [kg/s] mass flow

From ab660cef22d844d99aae31db8fb74a55ab45272f Mon Sep 17 00:00:00 2001
From: matthew-kapp <mattkapp.python@gmail.com>
Date: Wed, 5 Mar 2025 20:11:30 +0200
Subject: [PATCH 3/6] Revert "unit removed from VariableResistor - all tests
 pass now"

This reverts commit fb90653cdb0f1264943fd4dfb2457bed5c434321.
---
 src/Electrical/Analog/ideal_components.jl | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/Electrical/Analog/ideal_components.jl b/src/Electrical/Analog/ideal_components.jl
index ef3775727..a4896446d 100644
--- a/src/Electrical/Analog/ideal_components.jl
+++ b/src/Electrical/Analog/ideal_components.jl
@@ -391,9 +391,11 @@ R = R_const + pos * R_ref * (1 + alpha * (port.T - T_ref))
     end
 
     @parameters begin
-        R_ref = 1.0, [description = "Resistance at temperature T_ref when fully closed (pos=1.0) (Ω)"]
-        T_ref = 300.15, [description = "Reference temperature (K)"]
-        R_const = 1e-3, [description = "Constant resistance between p and n (Ω)"]
+        R_ref = 1.0,
+        [description = "Resistance at temperature T_ref when fully closed (pos=1.0)",
+            unit = "Ω"]
+        T_ref = 300.15, [description = "Reference temperature", unit = "K"]
+        R_const = 1e-3, [description = "Constant resistance between p and n", unit = "Ω"]
     end
 
     @components begin
@@ -402,13 +404,13 @@ R = R_const + pos * R_ref * (1 + alpha * (port.T - T_ref))
 
     @variables begin
         pos(t), [description = "Position of the wiper (normally 0-1)"]
-        R(t), [description = "Resistance (Ω)"]
+        R(t), [description = "Resistance", unit = "Ω"]
     end
 
     if T_dep
         @parameters begin
             alpha = 1e-3,
-            [description = "Temperature coefficient of resistance (K^-1)"]
+            [description = "Temperature coefficient of resistance", unit = "K^-1"]
         end
         @components begin
             port = HeatPort()

From eefec54a17db4fe97c28958ec69af8ca3605eb8f Mon Sep 17 00:00:00 2001
From: matthew-kapp <mattkapp.python@gmail.com>
Date: Thu, 6 Mar 2025 11:30:52 +0200
Subject: [PATCH 4/6] test and documentation build errors fixed -
 VariableResistor in src.Electrical.Analog.ideal_components modified -- Unit =
 descriptor removed -- No longer an UnboundError during Pkg.test() - make.jl
 in docs modified -- linkcheck_ignore added for the Mathworks link -- It seems
 the link works and is valid when manually visiting in browser -- No longer a
 403 Forbidden error when running docs/make.jl

---
 docs/make.jl                              |  1 +
 src/Electrical/Analog/ideal_components.jl | 12 +++++-------
 2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/docs/make.jl b/docs/make.jl
index 3a6e05ec8..a0cac1b6d 100644
--- a/docs/make.jl
+++ b/docs/make.jl
@@ -31,6 +31,7 @@ makedocs(sitename = "ModelingToolkitStandardLibrary.jl",
         ModelingToolkitStandardLibrary.Hydraulic,
         ModelingToolkitStandardLibrary.Hydraulic.IsothermalCompressible],
     clean = true, doctest = false, linkcheck = true,
+    linkcheck_ignore = ["https://www.mathworks.com/help/simscape/ug/basic-principles-of-modeling-physical-networks.html#bq89sba-6"],
     warnonly = [:docs_block, :missing_docs, :cross_references],
     format = Documenter.HTML(assets = ["assets/favicon.ico"],
         canonical = "https://docs.sciml.ai/ModelingToolkitStandardLibrary/stable/"),
diff --git a/src/Electrical/Analog/ideal_components.jl b/src/Electrical/Analog/ideal_components.jl
index a4896446d..da25edf15 100644
--- a/src/Electrical/Analog/ideal_components.jl
+++ b/src/Electrical/Analog/ideal_components.jl
@@ -392,10 +392,9 @@ R = R_const + pos * R_ref * (1 + alpha * (port.T - T_ref))
 
     @parameters begin
         R_ref = 1.0,
-        [description = "Resistance at temperature T_ref when fully closed (pos=1.0)",
-            unit = "Ω"]
-        T_ref = 300.15, [description = "Reference temperature", unit = "K"]
-        R_const = 1e-3, [description = "Constant resistance between p and n", unit = "Ω"]
+        [description = "Resistance at temperature T_ref when fully closed (pos=1.0) (Ω)"]
+        T_ref = 300.15, [description = "Reference temperature (K)"]
+        R_const = 1e-3, [description = "Constant resistance between p and n (Ω)"]
     end
 
     @components begin
@@ -404,13 +403,12 @@ R = R_const + pos * R_ref * (1 + alpha * (port.T - T_ref))
 
     @variables begin
         pos(t), [description = "Position of the wiper (normally 0-1)"]
-        R(t), [description = "Resistance", unit = "Ω"]
+        R(t), [description = "Resistance (Ω)"]
     end
 
     if T_dep
         @parameters begin
-            alpha = 1e-3,
-            [description = "Temperature coefficient of resistance", unit = "K^-1"]
+            alpha = 1e-3, [description = "Temperature coefficient of resistance (K^-1)"]
         end
         @components begin
             port = HeatPort()

From 07c7914a246c4cecac2c130815e874561f45a8c8 Mon Sep 17 00:00:00 2001
From: matthew-kapp <mattkapp.python@gmail.com>
Date: Thu, 6 Mar 2025 11:40:52 +0200
Subject: [PATCH 5/6] Hydraulic updates deleted

---
 docs/src/assets/Project.toml                  | 22 ------------
 .../IsothermalCompressible/components.jl      | 36 +++++++++++++++----
 .../IsothermalCompressible/sources.jl         |  2 +-
 3 files changed, 30 insertions(+), 30 deletions(-)
 delete mode 100644 docs/src/assets/Project.toml

diff --git a/docs/src/assets/Project.toml b/docs/src/assets/Project.toml
deleted file mode 100644
index e6c6be7c7..000000000
--- a/docs/src/assets/Project.toml
+++ /dev/null
@@ -1,22 +0,0 @@
-[deps]
-ControlSystemsBase = "aaaaaaaa-a6ca-5380-bf3e-84a91bcd477e"
-DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
-DataInterpolations = "82cc6244-b520-54b8-b5a6-8a565e85f1d0"
-DifferentialEquations = "0c46a032-eb83-5123-abaf-570d42b7fbaa"
-Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
-IfElse = "615f187c-cbe4-4ef1-ba3b-2fcf58d6d173"
-ModelingToolkit = "961ee093-0014-501f-94e3-6117800e7a78"
-ModelingToolkitStandardLibrary = "16a59e39-deab-5bd0-87e4-056b12336739"
-OrdinaryDiffEq = "1dea7af3-3e70-54e6-95c3-0bf5283fa5ed"
-Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
-
-[compat]
-ControlSystemsBase = "1.1"
-DataFrames = "1.7"
-DataInterpolations = "6.4, 7"
-DifferentialEquations = "7.6"
-Documenter = "1"
-IfElse = "0.1"
-ModelingToolkit = "9"
-OrdinaryDiffEq = "6.31"
-Plots = "1.36"
diff --git a/src/Hydraulic/IsothermalCompressible/components.jl b/src/Hydraulic/IsothermalCompressible/components.jl
index 1ca63150c..be891ee4c 100644
--- a/src/Hydraulic/IsothermalCompressible/components.jl
+++ b/src/Hydraulic/IsothermalCompressible/components.jl
@@ -1,9 +1,12 @@
 
 """
-    Cap(; name)
+    Cap(; p_int, name)
 
 Caps a hydraulic port to prevent mass flow in or out.
 
+# Parameters:
+- `p_int`: [Pa] initial pressure (set by `p_int` argument)
+
 # Connectors:
 - `port`: hydraulic port
 """
@@ -21,10 +24,13 @@ Caps a hydraulic port to prevent mass flow in or out.
 end
 
 """
-    Open(; name)
+    Open(; p_int, name)
 
 Provides an "open" boundary condition for a hydraulic port such that mass flow `dm` is non-zero.  This is opposite from an un-connected hydraulic port or the `Cap` boundary component which sets the mass flow `dm` to zero.  
 
+# Parameters:
+- `p_int`: [Pa] initial pressure (set by `p_int` argument)
+
 # Connectors:
 - `port`: hydraulic port
 """
@@ -220,11 +226,12 @@ end
 @deprecate Pipe Tube
 
 """
-    FlowDivider(; n, name)
+    FlowDivider(;p_int, n, name)
 
 Reduces the flow from `port_a` to `port_b` by `n`.  Useful for modeling parallel tubes efficiently by placing a `FlowDivider` on each end of a tube.
 
 # Parameters:
+- `p_int`: [Pa] initial pressure
 - `n`: divide flow from `port_a` to `port_b` by `n`
 
 # Connectors:
@@ -306,11 +313,14 @@ end
 end
 
 """
-    Valve(reversible = false; Cd, Cd_reverse = Cd, minimum_area = 0, name)
+    Valve(reversible = false; p_a_int, p_b_int, area_int, Cd, Cd_reverse = Cd, minimum_area = 0, name)
 
 Valve with `area` input and discharge coefficient `Cd` defined by https://en.wikipedia.org/wiki/Discharge_coefficient.  The `Cd_reverse` parameter allows for directional flow restriction, making it possible to define a check valve.
 
 # Parameters:
+- `p_a_int`: [Pa] initial pressure for `port_a`
+- `p_b_int`: [Pa] initial pressure for `port_b`
+- `area_int`: [m^2] initial valve opening
 - `Cd`: discharge coefficient flowing from `a → b`
 - `Cd_reverse`: discharge coefficient flowing from `b → a`
 - `minimum_area`: when `reversible = false` applies a forced minimum area
@@ -497,7 +507,7 @@ See also [`FixedVolume`](@ref), [`DynamicVolume`](@ref)
 end
 
 """
-    DynamicVolume(N, add_inertia=true; area, x_int = 0, x_max, x_min = 0, x_damp = x_min, direction = +1, perimeter = 2 * sqrt(area * pi), shape_factor = 64, head_factor = 1, Cd = 1e2, Cd_reverse = Cd, name)
+    DynamicVolume(N, add_inertia=true; p_int,  area, x_int = 0, x_max, x_min = 0, x_damp = x_min, direction = +1, perimeter = 2 * sqrt(area * pi), shape_factor = 64, head_factor = 1, Cd = 1e2, Cd_reverse = Cd, name)
 
 Volume with moving wall with `flange` connector for converting hydraulic energy to 1D mechanical.  The `direction` argument aligns the mechanical port with the hydraulic port, useful when connecting two dynamic volumes together in oppsing directions to create an actuator.
 
@@ -670,11 +680,14 @@ dm ────►               │  │ area
 end
 
 """
-    SpoolValve(reversible = false; Cd, d, name)
+    SpoolValve(reversible = false; p_a_int, p_b_int, x_int, Cd, d, name)
 
 Spool valve with `x` valve opening input as mechanical flange port and `d` diameter of orifice. See `Valve` for more information.
 
 # Parameters:
+- `p_a_int`: [Pa] initial pressure for `port_a`
+- `p_b_int`: [Pa] initial pressure for `port_b`
+- `x_int`: [m] initial valve opening
 - `d`: [m] orifice diameter
 - `Cd`: discharge coefficient flowing from `a → b`
 
@@ -714,13 +727,18 @@ See [`Valve`](@ref) for more information.
 end
 
 """
-    SpoolValve2Way(reversible = false; m, g, Cd, d, name)
+    SpoolValve2Way(reversible = false; p_s_int, p_a_int, p_b_int, p_r_int, m, g, x_int, Cd, d, name)
 
 2-ways spool valve with 4 ports and spool mass. Fluid flow direction S → A and B → R when `x` is positive and S → B and A → R when `x` is negative. 
 
 # Parameters:
+- `p_s_int`: [Pa] initial pressure for `port_s`
+- `p_a_int`: [Pa] initial pressure for `port_a`
+- `p_b_int`: [Pa] initial pressure for `port_b`
+- `p_r_int`: [Pa] initial pressure for `port_r`
 - `m`: [kg] mass of the  spool
 - `g`: [m/s²] gravity field acting on the spool, positive value acts in the positive direction
+- `x_int`: [m] initial valve opening
 - `d`: [m] orifice diameter
 - `Cd`: discharge coefficient flowing from `s → a` and `b → r`
 
@@ -770,6 +788,8 @@ end
 
 """
     Actuator(N, add_inertia = true, reversible = false;
+        p_a_int,
+        p_b_int,
         area_a,
         area_b,
         perimeter_a = 2 * sqrt(area_a * pi),
@@ -799,6 +819,8 @@ Actuator made of two DynamicVolumes connected in opposite direction with body ma
 
 # Parameters:
 ## volume
+- `p_a_int`: [Pa] initial pressure for `port_a`
+- `p_b_int`: [Pa] initial pressure for `port_b`
 - `area_a`: [m^2] moving wall area of volume `A`
 - `area_b`: [m^2] moving wall area of volume `B`
 - `length_a_int`: [m] initial wall position for `A`
diff --git a/src/Hydraulic/IsothermalCompressible/sources.jl b/src/Hydraulic/IsothermalCompressible/sources.jl
index d5d64f5f3..ee21959d7 100644
--- a/src/Hydraulic/IsothermalCompressible/sources.jl
+++ b/src/Hydraulic/IsothermalCompressible/sources.jl
@@ -1,5 +1,5 @@
 """
-    MassFlow(; name)
+    MassFlow(; name, p_int)
 
 Hydraulic mass flow input source
 

From be560a167baa43b705a822ef1d8b5eef1b52ff28 Mon Sep 17 00:00:00 2001
From: matthew-kapp <mattkapp.python@gmail.com>
Date: Thu, 6 Mar 2025 11:44:17 +0200
Subject: [PATCH 6/6] src.Hydraulic.IsothermalCOmpressible.utils.jl reverted

---
 src/Hydraulic/IsothermalCompressible/utils.jl | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/Hydraulic/IsothermalCompressible/utils.jl b/src/Hydraulic/IsothermalCompressible/utils.jl
index 165c6adc1..425686d1f 100644
--- a/src/Hydraulic/IsothermalCompressible/utils.jl
+++ b/src/Hydraulic/IsothermalCompressible/utils.jl
@@ -4,10 +4,14 @@ regPow(x, a, delta = 0.01) = x * (x * x + delta * delta)^((a - 1) / 2);
 regRoot(x, delta = 0.01) = regPow(x, 0.5, delta)
 
 """
-    HydraulicPort(; name)
+    HydraulicPort(;p_int, name)
 
 Connector port for hydraulic components.
 
+# Arguments:
+
+- `p_int`: [Pa] initial gauge pressure
+
 # States:
 - `p`: [Pa] gauge total pressure
 - `dm`: [kg/s] mass flow